M3: glass effects take variables, and their frost stays within 0–100 (#1886)

* M3: glass effects take variables, and their frost stays within 0–100 (#1885)

Glass's light angle, intensity, refraction, depth, dispersion, frost and
splay bind to number variables, on a layer (`variable.bind`,
`effects/<i>/<field>`, `radius` being the frost) and in an effect style
(`style.bind`), and the Design panel's glass fields take a variable like
the shadow and blur fields. A variable reads as the field shows it:
intensity, refraction, dispersion and splay in percent.

A glass's frost stays within 0–100, the reference tool's range: a larger
frost from an older file draws at 100, and the field, a bound variable and
scaling stop there.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* M3: a frost from an older file scales and shows as it draws (#1885)

Review follow-up: a frost saved past 100 draws at 100, so scaling a layer
starts from that (150 halved draws at 50, not 75) and the Design panel's
Frost field shows it. The revision row's binding path escapes its pipes, so
the table keeps three columns.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* M3: Dev Mode and .fig export show a frost from an older file as it draws (#1885)

A frost saved before the 0–100 range draws at 100, and the canvas, CSS and
scaling already read it that way, but Dev Mode's Glass row and the .fig
export still read the stored number, so they said 150 where the canvas
shows 100. Both now read the sanitized frost.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: Oleksii Sukholita <oleksii.sukholita@gmail.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: FredApps <153173854+FredApps@users.noreply.github.com>

ROADMAP.md

@@ -2,7 +2,7 @@
 
 **Stage: alpha** · next: beta, ~26 points and ~162–292 h away (one Opus 5.5 agent; ~33–67 h wall-clock with 5 agents)
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-30 · **Change:** minor (web host bridge: `?host=parent` or `data-host="page"` hands a page the app's files, documented in the hosting guide; a connector end moved with Cmd/Ctrl held goes on any part of an object, and stays there as the object moves or resizes; a tap on a plugin panel's button keeps what was typed in its fields; a Dash cap setting (none, round or square) on Dash and Custom strokes, drawn on both ends of every dash; library analytics list how many layers and files use each style and variable; the Controller menu names each button as PlayStation and Switch controllers do; widgets draw lines and SVG pictures (plugin API 6); a connector end dropped along a side of a shape attaches to that side (#1708); regression tests pin a rounded shape's one-sided stroke and SVG ids and font families without XML-forbidden characters (#1351, #1124); a damaged image is refused with a reason instead of showing as an empty box (#1474); an image copied in another app pastes again on the desktop, and in the browser for the first time (#492); SwiftUI and Compose code names a bound variable by its iOS or Android code syntax; the colour picker's Image tab shows a placeholder and Upload from computer, an asset preview, and a file dropped on it replaces the image, keeping the fill mode, crop and position (#1682); the Frame tool's Phone presets have the iPhone 17 family (#1691); Show in folder works in the Flatpak build and selects the file on Linux (#1701); a dashed line starts and ends with a half-length dash, on the canvas and in exports; the Pages, Layers and Assets search fields keep their text in the middle of the field (#1703); a board connector's path can be reshaped by dragging its path handles (#1710); boards have 16 more shapes (arrows, polygons, star, plus and flowchart symbols), in pickers that lay them out in a grid; library analytics count insertions and show insertions and detachments over the past 30 days, 90 days or year; a stroke's Custom style takes a dash pattern of any length as a comma-separated list (#1681); a control request can set its own timeout, up to 10 minutes (`timeoutMs`; `figcraft-cli mcp --attach PORT --timeout SECONDS`) (#1696); gap 6: a widget opens its plugin's panel (plugin API 5), whose callbacks redraw it; the keyboard's Menu key opens the context menu, as Shift+F10 does; an Open link action can open in place of the prototype, with "Open in new tab" off (gap 15); a collection of this file can be extended (Extend collection on its row, `variable.extendCollection`), its extension following its edits at once, and extended collections extend again in the file; the eyedropper with Cmd/Ctrl+Shift makes a colour style or variable of what it picks; a live session's welcome sends the document compressed to clients that read it, about seven times smaller (#1665); a control request that times out says truthfully whether it was dropped or is still running and will take effect, and only screenshots and input blame the window (#1673); a board keeps earlier votes' results, listed newest first in Results and deleted one at a time; the object a stamp will stick to is outlined while the stamp tool is over it or a stamp is dragged over it, and board objects take no drops (gap 24); a server can list the files shared from it now for everyone who reaches it, Home ▸ Online shows them and their links carry no secret (`team_files`, part of #742); team library analytics count detached instances per component and file (gap 10); skipping the Open link notice by command is saved with the preferences at once (gap 15); a selected connector's bar on a board sets its start and end points, solid or dashed, its weight and any colour (#1596); cells copied from a spreadsheet paste onto a board as a table; a long layer name stays on one line in the Export button and the Dev Mode header, ending with an ellipsis, and no longer covers the Design panel (#1650); with hundreds of layers selected, the Design panel and the selection overlays stop going over the whole selection on every frame, so dragging 648 layers averages about 1.1 ms of UI per frame (#1571); plugin panels show pictures: an `image` control, base64 within 256 KB and 4,096 px a side, named by its label (gap 6); `.fig` connector labels without a saved snapshot are kept, centred on their line (gap 1); a drag moving many layers re-runs only what sits around them, not each layer's bindings, sizing, text and instance checks, on every move (#1571); damaged font tracking table offsets are checked instead of wrapping on 32-bit targets, and font indexing makes its existing offset bounds explicit (#1125); Bosnian (`bs`) draft catalog; text style dedupe is O(spans) via a last-two cache and fingerprint buckets (#1102); pasted layers whose image the clipboard lacks are named and show a placeholder that reads as missing (#1646); paint-style colours on layers pasted from another design app keep their style insLine truncated
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-11-02 · **Change:** minor (glass effects take variables and keep their frost within 0–100; web host bridge: `?host=parent` or `data-host="page"` hands a page the app's files, documented in the hosting guide; a connector end moved with Cmd/Ctrl held goes on any part of an object, and stays there as the object moves or resizes; a tap on a plugin panel's button keeps what was typed in its fields; a Dash cap setting (none, round or square) on Dash and Custom strokes, drawn on both ends of every dash; library analytics list how many layers and files use each style and variable; the Controller menu names each button as PlayStation and Switch controllers do; widgets draw lines and SVG pictures (plugin API 6); a connector end dropped along a side of a shape attaches to that side (#1708); regression tests pin a rounded shape's one-sided stroke and SVG ids and font families without XML-forbidden characters (#1351, #1124); a damaged image is refused with a reason instead of showing as an empty box (#1474); an image copied in another app pastes again on the desktop, and in the browser for the first time (#492); SwiftUI and Compose code names a bound variable by its iOS or Android code syntax; the colour picker's Image tab shows a placeholder and Upload from computer, an asset preview, and a file dropped on it replaces the image, keeping the fill mode, crop and position (#1682); the Frame tool's Phone presets have the iPhone 17 family (#1691); Show in folder works in the Flatpak build and selects the file on Linux (#1701); a dashed line starts and ends with a half-length dash, on the canvas and in exports; the Pages, Layers and Assets search fields keep their text in the middle of the field (#1703); a board connector's path can be reshaped by dragging its path handles (#1710); boards have 16 more shapes (arrows, polygons, star, plus and flowchart symbols), in pickers that lay them out in a grid; library analytics count insertions and show insertions and detachments over the past 30 days, 90 days or year; a stroke's Custom style takes a dash pattern of any length as a comma-separated list (#1681); a control request can set its own timeout, up to 10 minutes (`timeoutMs`; `figcraft-cli mcp --attach PORT --timeout SECONDS`) (#1696); gap 6: a widget opens its plugin's panel (plugin API 5), whose callbacks redraw it; the keyboard's Menu key opens the context menu, as Shift+F10 does; an Open link action can open in place of the prototype, with "Open in new tab" off (gap 15); a collection of this file can be extended (Extend collection on its row, `variable.extendCollection`), its extension following its edits at once, and extended collections extend again in the file; the eyedropper with Cmd/Ctrl+Shift makes a colour style or variable of what it picks; a live session's welcome sends the document compressed to clients that read it, about seven times smaller (#1665); a control request that times out says truthfully whether it was dropped or is still running and will take effect, and only screenshots and input blame the window (#1673); a board keeps earlier votes' results, listed newest first in Results and deleted one at a time; the object a stamp will stick to is outlined while the stamp tool is over it or a stamp is dragged over it, and board objects take no drops (gap 24); a server can list the files shared from it now for everyone who reaches it, Home ▸ Online shows them and their links carry no secret (`team_files`, part of #742); team library analytics count detached instances per component and file (gap 10); skipping the Open link notice by command is saved with the preferences at once (gap 15); a selected connector's bar on a board sets its start and end points, solid or dashed, its weight and any colour (#1596); cells copied from a spreadsheet paste onto a board as a table; a long layer name stays on one line in the Export button and the Dev Mode header, ending with an ellipsis, and no longer covers the Design panel (#1650); with hundreds of layers selected, the Design panel and the selection overlays stop going over the whole selection on every frame, so dragging 648 layers averages about 1.1 ms of UI per frame (#1571); plugin panels show pictures: an `image` control, base64 within 256 KB and 4,096 px a side, named by its label (gap 6); `.fig` connector labels without a saved snapshot are kept, centred on their line (gap 1); a drag moving many layers re-runs only what sits around them, not each layer's bindings, sizing, text and instance checks, on every move (#1571); damaged font tracking table offsets are checked instead of wrapping on 32-bit targets, and font indexing makes its existing offset bounds explicit (#1125); Bosnian (`bs`) draft catalog; text style dedupe is O(spans) via a last-two cache and fingerprint buckets (#1102); pasted layers whose image the clipboard lacks are named and show a placeholder that reads as missing (#1646); paint-style colLine truncated
 
 FigCraft is a clean-room, open-source, pure-Rust reimplementation of the Figma design workflow,
 native on macOS, Windows, Linux and FreeBSD and in the browser, fully drivable by agents through
@@ -358,6 +358,7 @@ Ranked; detail and milestones in [`docs/roadmap.md`](docs/roadmap.md).
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-11-02 | minor | M3, #1885: glass effects take variables (light angle, intensity, refraction, depth, dispersion, frost and splay, on layers and in effect styles, and from the Design panel's glass fields), and a glass's frost stays within 0–100, the reference tool's range: a larger frost from an older file draws at 100, and the field, a bound variable and scaling stop there. Numbers unchanged |
 | 2026-10-31 | minor | M12: as the help describes, holding Cmd/Ctrl while moving a connector's end places it on any part of an object instead of snapping to a side. It keeps that spot as a fraction of the object's box, so it follows the object when it moves or resizes, and without the key an end snaps as before. `board.connector {fromAt, toAt}` and `board.reattach {at}` take it; saved only when set. Numbers unchanged |
 | 2026-10-31 | patch | M11: a trackpad or touch tap sends its press and release in one frame, so a plugin panel's field committed in the frame its button was clicked and the value was lost: the Counter's Set count… kept the old count. The plugin now gets both, the field's value first. The `window.figcraft` docs name `screenshot`'s `data`. Numbers unchanged |
 | 2026-10-31 | patch | M4: Dash and Custom strokes have a Dash cap (None, Round, Square) in the advanced stroke settings and `node.set {dashCap}`, on both ends of every dash on the canvas and in PNG, PDF and SVG. Unset, dashes keep taking the end point caps, so older files look the same; the saved file writes it only when set. Numbers unchanged |

crates/doc/src/effects_tests.rs

@@ -49,6 +49,47 @@ fn glass_values_are_clamped_and_reach_their_backdrop() {
     assert_eq!(hidden.backdrop_radius(), 0.0);
 }
 
+#[test]
+fn glass_frost_stays_within_the_reference_range() {
+    // A file from before the 0–100 range draws its frost at 100, and reaches no further.
+    let g = Glass { frost: 150.0, ..Glass::default() };
+    assert_eq!(g.sanitized().frost, Glass::MAX_FROST);
+    let e = Effect { kind: EffectKind::Glass(g), visible: true };
+    let capped = Effect { kind: EffectKind::Glass(Glass { frost: Glass::MAX_FROST, ..Glass::default() }), visible: true };
+    assert_eq!(e.backdrop_radius(), capped.backdrop_radius());
+}
+
+#[test]
+fn glass_fields_take_bound_numbers_as_the_panel_shows_them() {
+    let mut g = Glass::default();
+    for (field, x) in [
+        ("lightAngle", 30.0),
+        ("lightIntensity", 25.0),
+        ("refraction", 40.0),
+        ("depth", 12.0),
+        ("dispersion", 10.0),
+        ("radius", 8.0),
+        ("splay", 50.0),
+    ] {
+        assert!(g.set_bound(field, x), "{field}");
+    }
+    assert_eq!((g.light_angle, g.light_intensity, g.refraction, g.depth, g.dispersion, g.frost, g.splay), (30.0, 0.25, 0.4, 12.0, 0.1, 8.0, 0.5));
+    // Out of range: clamped to the field's range.
+    for (field, x) in [("lightAngle", 270.0), ("lightIntensity", 250.0), ("depth", 0.0), ("radius", 150.0), ("splay", -5.0)] {
+        assert!(g.set_bound(field, x), "{field}");
+    }
+    assert_eq!((g.light_angle, g.light_intensity, g.depth, g.frost, g.splay), (180.0, 1.0, 1.0, Glass::MAX_FROST, 0.0));
+    // A field glass doesn't have, or a value that isn't a number, changes nothing.
+    let before = g.clone();
+    assert!(!g.set_bound("spread", 3.0));
+    assert!(!g.set_bound("splay", f64::NAN));
+    assert!(!g.set_bound("depth", f64::INFINITY));
+    assert_eq!(g, before);
+    for field in Glass::BOUND_FIELDS {
+        assert!(Glass::default().set_bound(field, 1.0), "{field}");
+    }
+}
+
 #[test]
 fn effect_colours() {
     let mut e = Effect::noise();

crates/doc/src/props.rs

@@ -660,7 +660,7 @@ pub struct Glass {
     pub depth: f64,
     /// Colour splitting along the curved edge (0–1).
     pub dispersion: f64,
-    /// Blur of the backdrop (a blur radius, document units).
+    /// Blur of the backdrop (a blur radius, document units, 0–[`Self::MAX_FROST`]).
     pub frost: f64,
     /// How widely the light spreads over the glass (0–1).
     pub splay: f64,
@@ -673,6 +673,34 @@ impl Default for Glass {
 }
 
 impl Glass {
+    /// The most frost a glass takes, as the reference tool's Frost field (0–100).
+    pub const MAX_FROST: f64 = 100.0;
+
+    /// The fields a variable binds on a glass effect (`effects/<i>/<field>`), see [`Self::set_bound`].
+    pub const BOUND_FIELDS: [&'static str; 7] = ["lightAngle", "lightIntensity", "refraction", "depth", "dispersion", "radius", "splay"];
+
+    /// Sets `field` (one of [`Self::BOUND_FIELDS`]) from a bound number variable, read as the
+    /// Design panel's field shows it: intensity, refraction, dispersion and splay in percent, the
+    /// frost as `radius`, each clamped to the field's range. False for a field glass doesn't have
+    /// or a value that isn't finite (nothing changes).
+    pub fn set_bound(&mut self, field: &str, x: f64) -> bool {
+        if !x.is_finite() {
+            return false;
+        }
+        let pct = (x / 100.0).clamp(0.0, 1.0);
+        match field {
+            "lightAngle" => self.light_angle = x.clamp(-180.0, 180.0),
+            "lightIntensity" => self.light_intensity = pct,
+            "refraction" => self.refraction = pct,
+            "depth" => self.depth = x.clamp(1.0, 1000.0),
+            "dispersion" => self.dispersion = pct,
+            "radius" => self.frost = x.clamp(0.0, Self::MAX_FROST),
+            "splay" => self.splay = pct,
+            _ => return false,
+        }
+        true
+    }
+
     /// The values clamped to their ranges (non-finite ones at their defaults).
     pub fn sanitized(&self) -> Glass {
         let d = Glass::default();
@@ -683,7 +711,7 @@ impl Glass {
             refraction: ok(self.refraction, d.refraction, 0.0, 1.0),
             depth: ok(self.depth, d.depth, 1.0, 1000.0),
             dispersion: ok(self.dispersion, d.dispersion, 0.0, 1.0),
-            frost: ok(self.frost, d.frost, 0.0, 1000.0),
+            frost: ok(self.frost, d.frost, 0.0, Self::MAX_FROST),
             splay: ok(self.splay, d.splay, 0.0, 1.0),
         }
     }

crates/engine/src/assets/style_vars.rs

@@ -33,6 +33,7 @@ pub fn field_type(kind: &StyleKind, key: &str) -> Option<VariableType> {
             (EffectKind::DropShadow(_) | EffectKind::InnerShadow(_), "color") => Some(Color),
             (EffectKind::DropShadow(_) | EffectKind::InnerShadow(_), "radius" | "spread" | "offsetX" | "offsetY") => Some(Number),
             (EffectKind::LayerBlur(_) | EffectKind::BackgroundBlur(_), "radius" | "startRadius") => Some(Number),
+            (EffectKind::Glass(_), f) if figcraft_doc::Glass::BOUND_FIELDS.contains(&f) => Some(Number),
             _ => None,
         },
         (StyleKind::Grid { grids }, Some((BoundList::Grids, i, "size" | "count" | "gutter" | "offset"))) => grids.get(i).map(|_| Number),

crates/engine/src/binding_lists_tests.rs

@@ -98,6 +98,41 @@ fn effect_moves_and_removals_reject_junk() {
     assert_eq!(s.doc().unwrap().node(r).unwrap().effects.len(), 1);
 }
 
+fn glass(s: &Session, r: NodeId) -> figcraft_doc::Glass {
+    match s.doc().unwrap().node(r).unwrap().effects.first().map(|e| &e.kind) {
+        Some(EffectKind::Glass(g)) => g.clone(),
+        k => panic!("{k:?}"),
+    }
+}
+
+#[test]
+fn glass_fields_take_number_variables() {
+    let (mut s, r) = setup();
+    ex(&mut s, "effect.add", json!({"ids": [r], "type": "glass"}));
+    // Percent fields read the variable as the Design panel shows them; `radius` is the frost.
+    ex(&mut s, "variable.bind", json!({"ids": [r], "field": "effects/0/splay", "variable": "large"}));
+    ex(&mut s, "variable.bind", json!({"ids": [r], "field": "effects/0/radius", "variable": "small"}));
+    ex(&mut s, "variable.bind", json!({"ids": [r], "field": "effects/0/depth", "variable": "large"}));
+    let g = glass(&s, r);
+    assert_eq!((g.splay, g.frost, g.depth), (0.3, 2.0, 30.0));
+    // A new value follows, clamped to the field's range (frost stops at 100).
+    ex(&mut s, "variable.set", json!({"variable": "small", "value": 150}));
+    ex(&mut s, "variable.set", json!({"variable": "large", "value": 75}));
+    let g = glass(&s, r);
+    assert_eq!((g.splay, g.frost, g.depth), (0.75, figcraft_doc::Glass::MAX_FROST, 75.0));
+    // A colour variable doesn't fit a glass field.
+    assert!(s.execute("variable.bind", &json!({"ids": [r], "field": "effects/0/refraction", "variable": "brand"})).is_err());
+    // An effect style binds them too, and every layer using it follows.
+    let fx = ex_value(&mut s, "style.create", json!({"type": "effect", "name": "Pane", "from": r}))["id"].as_str().unwrap().to_string();
+    ex(&mut s, "style.bind", json!({"style": fx, "field": "effects/0/refraction", "variable": "large"}));
+    assert_eq!(glass(&s, r).refraction, 0.75);
+    assert!(s.execute("style.bind", &json!({"style": fx, "field": "effects/0/spread", "variable": "large"})).is_err(), "glass has no spread");
+}
+
+fn ex_value(s: &mut Session, cmd: &str, p: serde_json::Value) -> serde_json::Value {
+    s.execute(cmd, &p).unwrap_or_else(|e| panic!("{cmd}: {e}"))
+}
+
 fn fill_hex(s: &Session, r: NodeId) -> Vec<String> {
     s.doc().unwrap().node(r).unwrap().fills.iter().filter_map(|p| p.solid_color()).map(|c| c.to_hex()).collect()
 }

crates/engine/src/cmd/arrange.rs

@@ -465,7 +465,8 @@ pub fn scale_node(doc: &mut Document, id: NodeId, k: f64) -> Result<()> {
                 }
                 EffectKind::Glass(g) => {
                     g.depth *= k;
-                    g.frost *= k;
+                    // From the frost it draws with (an older file's past 100 draws at 100).
+                    g.frost = (g.sanitized().frost * k).min(figcraft_doc::Glass::MAX_FROST);
                 }
             }
         }

crates/engine/src/cmd/styles.rs

@@ -53,7 +53,7 @@ pub fn specs() -> Vec<CommandSpec> {
         spec!(
             "style.bind",
             "Bind variable in style",
-            "{style, field, variable? (id or name; none: unbind)}  bind a variable to a field of the style's value: a paint style's `fills/<i>/color` (or `fill`: its first paint) and `fills/<i>/stops/<j>/color`, an effect style's `effects/<i>/<color|radius|spread|offsetX|offsetY|startRadius>`, a grid style's `layoutGrids/<i>/<size|count|gutter|offset>`, a text style's `fontSize|lineHeight|letterSpacing` (numbers, px) and `fontFamily|fontStyle` (strings). Every layer using the style shows the field resolved in its own modes; the style keeps it resolved in the default modes",
+            "{style, field, variable? (id or name; none: unbind)}  bind a variable to a field of the style's value: a paint style's `fills/<i>/color` (or `fill`: its first paint) and `fills/<i>/stops/<j>/color`, an effect style's `effects/<i>/<color|radius|spread|offsetX|offsetY|startRadius>` (glass: `lightAngle|lightIntensity|refraction|depth|dispersion|radius|splay`), a grid style's `layoutGrids/<i>/<size|count|gutter|offset>`, a text style's `fontSize|lineHeight|letterSpacing` (numbers, px) and `fontFamily|fontStyle` (strings). Every layer using the style shows the field resolved in its own modes; the style keeps it resolved in the default modes",
             true,
             bind_style
         ),
@@ -196,7 +196,7 @@ pub fn specs() -> Vec<CommandSpec> {
         spec!(
             "variable.bind",
             "Bind variable",
-            "{ids?, field (fill|stroke (first paint)|fills/<i>/color|strokes/<i>/color|fills/<i>/stops/<j>/color (gradient stops)|effects/<i>/<offsetX|offsetY|radius|startRadius|spread|color>|layoutGrids/<i>/<size|count|gutter|offset>|componentProperties/<name> (instances: boolean/text properties; variant properties take string variables naming a value)|width|height|opacity (percent)|cornerRadius|gap|paddingHorizontal|characters|visible|fontSize…; list indices bottom first), variable (null unbinds)}",
+            "{ids?, field (fill|stroke (first paint)|fills/<i>/color|strokes/<i>/color|fills/<i>/stops/<j>/color (gradient stops)|effects/<i>/<offsetX|offsetY|radius|startRadius|spread|color|lightAngle|lightIntensity|refraction|depth|dispersion|splay> (glass: `radius` is its frost; intensity, refraction, dispersion and splay in percent)|layoutGrids/<i>/<size|count|gutter|offset>|componentProperties/<name> (instances: boolean/text properties; variant properties take string variables naming a value)|width|height|opacity (percent)|cornerRadius|gap|paddingHorizontal|characters|visible|fontSize…; list indices bottom first), variable (null unbinds)}",
             true,
             bind
         ),
@@ -1304,6 +1304,9 @@ pub(crate) fn set_effect_field(effects: &mut [Effect], i: usize, prop: &str, val
         (EffectKind::DropShadow(s) | EffectKind::InnerShadow(s), "color", _, VariableValue::Color(c)) => s.color = *c,
         (EffectKind::LayerBlur(b) | EffectKind::BackgroundBlur(b), "radius", Some(x), _) => b.radius = x.max(0.0),
         (EffectKind::LayerBlur(b) | EffectKind::BackgroundBlur(b), "startRadius", Some(x), _) => b.start_radius = x.max(0.0),
+        (EffectKind::Glass(g), field, Some(x), _) => {
+            g.set_bound(field, x);
+        }
         _ => {}
     }
 }

crates/engine/src/dev/devinspect.rs

@@ -475,7 +475,7 @@ pub fn properties_with(doc: &Document, id: NodeId, fmt: ColorFormat) -> Vec<Sect
                     pct(g.refraction),
                     num(g.depth),
                     pct(g.dispersion),
-                    num(g.frost),
+                    num(g.sanitized().frost),
                     pct(g.splay)
                 ),
             ),

crates/engine/src/effects_tests.rs

@@ -95,6 +95,32 @@ fn scaling_scales_grain_and_glass() {
     assert_eq!((g.refraction, nz.density), (d.refraction, 0.5));
 }
 
+#[test]
+fn scaling_a_frost_from_an_older_file_starts_from_what_it_draws() {
+    // A frost of 150, saved before the 0–100 range, draws at 100: halved, it draws at 50.
+    let mut s = Session::new();
+    let r = rect(&mut s);
+    s.execute("effect.add", &json!({"ids": [r], "type": "glass"})).unwrap();
+    s.execute("effect.set", &json!({"ids": [r], "index": 0, "effect": {"type": "glass", "frost": 150}})).unwrap();
+    s.execute("transform.scale", &json!({"ids": [r], "factor": 0.5})).unwrap();
+    let EffectKind::Glass(g) = &s.doc().unwrap().node(r).unwrap().effects[0].kind else { panic!() };
+    assert_eq!(g.frost, 50.0);
+}
+
+#[test]
+fn inspect_shows_a_frost_from_an_older_file_as_it_draws() {
+    // A frost of 150, saved before the 0–100 range, draws at 100: Dev Mode says 100 as CSS does.
+    let mut s = Session::new();
+    let r = rect(&mut s);
+    s.execute("effect.add", &json!({"ids": [r], "type": "glass"})).unwrap();
+    s.execute("effect.set", &json!({"ids": [r], "index": 0, "effect": {"type": "glass", "frost": 150}})).unwrap();
+    let doc = s.doc().unwrap();
+    let sections = crate::devinspect::properties(doc, r);
+    let glass = &sections.iter().find(|s| s.title == "Effects").unwrap().rows[0];
+    assert!(glass.value.contains(" frost 100 "), "{}", glass.value);
+    assert!(code_for(doc, r, CodeLang::Css).contains("backdrop-filter: blur(50px);"));
+}
+
 #[test]
 fn inspect_and_css_show_the_new_effects() {
     let mut s = Session::new();

crates/format/src/fig/export/paint.rs

@@ -234,7 +234,7 @@ impl<'d> Exporter<'d> {
             }
             EffectKind::Glass(g) => {
                 self.warn("glass effects keep only their frost");
-                f.extend([("type", e("GLASS")), ("radius", fl(g.frost))]);
+                f.extend([("type", e("GLASS")), ("radius", fl(g.sanitized().frost))]);
             }
         }
         o(f)

crates/format/src/fig/export_tests.rs

@@ -1243,6 +1243,25 @@ fn local_samples_round_trip() {
     }
 }
 
+#[test]
+fn a_glass_frost_is_written_as_it_draws() {
+    // A frost saved before the 0–100 range (or not a number) is written at what it draws: 100, or
+    // the default.
+    for (frost, written) in [(12.0, 12.0), (500.0, Glass::MAX_FROST), (f64::NAN, Glass::default().frost)] {
+        let mut doc = Document::new("glass");
+        let page = doc.first_page().unwrap();
+        let r = doc.create(page, NodeKind::Rectangle, "Pane", 0.0, 0.0, 24.0, 24.0).unwrap();
+        doc.get_mut(r).unwrap().effects = vec![Effect { kind: EffectKind::Glass(Glass { frost, ..Glass::default() }), visible: true }];
+        let (bytes, _) = export(&doc, None).unwrap();
+        let archive = Archive::open(&bytes).unwrap();
+        let (schema, message) = decode_canvas(&archive.canvas).unwrap();
+        let msg = schema.decode_message(schema.find("Message").unwrap(), &message).unwrap();
+        let pane = msg.get("nodeChanges").unwrap().list().iter().find(|nc| nc.get("name").and_then(Kv::str) == Some("Pane")).unwrap();
+        let radius = pane.get("effects").unwrap().list()[0].get("radius").and_then(Kv::f64).unwrap();
+        assert_eq!(radius, written, "frost {frost}");
+    }
+}
+
 #[test]
 fn a_vector_drawable_export_setting_is_written_as_svg_with_a_warning() {
     let mut doc = Document::new("vd");

crates/ui-egui/src/field_tests.rs

@@ -667,11 +667,11 @@ fn the_glass_light_intensity_field_has_a_label() {
     u.ctx.data_mut(|d| d.insert_temp(Id::unique(("fx_open", 0usize)), true));
     u.frame(vec![]);
     let shapes = u.frame_output(vec![]).shapes;
-    let lead = u.ctx.read_response(Id::unique(("fx_gi", 0usize)).with("lead")).expect("the intensity field is shown").rect;
+    let lead = u.ctx.read_response(Id::unique(("fx", "lightIntensity", 0usize)).with("lead")).expect("the intensity field is shown").rect;
     let labels: Vec<(String, bool)> =
         painted_texts(&shapes).into_iter().filter(|(_, _, at)| lead.contains(at.center())).map(|(text, cut, _)| (text, cut)).collect();
     assert_eq!(labels, [("Intensity".to_string(), false)], "labelled, and not cut short");
-    let field = u.ctx.read_response(Id::unique(("fx_gi", 0usize)).with("field")).expect("its value").rect;
+    let field = u.ctx.read_response(Id::unique(("fx", "lightIntensity", 0usize)).with("field")).expect("its value").rect;
     assert_eq!(field.max.x - lead.min.x, GLASS_FIELD_W, "the width the next test measures against");
 }
 

crates/ui-egui/src/panels/right/effects.rs

@@ -108,7 +108,22 @@ pub(crate) fn effect_open(ctx: &egui::Context, i: usize) -> bool {
 
 /// A number field of effect `i` that can be bound to a variable (`effects/<i>/<prop>`).
 fn fx_field(app: &mut FigApp, ui: &mut Ui, ids: &[NodeId], i: usize, prop: &str, lead: Lead, value: f64, width: f32) -> Option<FieldEdit> {
-    crate::variable_ui::number_field(app, ui, ids, &format!("effects/{i}/{prop}"), Id::unique(("fx", prop, i)), lead, Some(value), "", width)
+    fx_field_in(app, ui, ids, i, prop, lead, Some(value), "", width)
+}
+
+/// [`fx_field`] showing `value` as given (a glass percentage) with `suffix` after it.
+fn fx_field_in(
+    app: &mut FigApp,
+    ui: &mut Ui,
+    ids: &[NodeId],
+    i: usize,
+    prop: &str,
+    lead: Lead,
+    value: Option<f64>,
+    suffix: &str,
+    width: f32,
+) -> Option<FieldEdit> {
+    crate::variable_ui::number_field(app, ui, ids, &format!("effects/{i}/{prop}"), Id::unique(("fx", prop, i)), lead, value, suffix, width)
 }
 
 /// Draw type-specific effect fields for shadows, blurs, noise, texture and glass, using live
@@ -290,29 +305,30 @@ fn effect_settings(app: &mut FigApp, ui: &mut Ui, ids: &[NodeId], i: usize, e: &
                     }
                 })
             };
+            // Each field takes a variable (`effects/<i>/<field>`), read as the field shows it:
+            // percentages for the 0–1 values, and the frost as `radius` (see `Glass::set_bound`).
             let pct = |v: f64| Some((v * 100.0).round());
             let unit = |v: f64| (v / 100.0).clamp(0.0, 1.0);
             row(ui, 32.0, |ui| {
-                let ed =
-                    widgets::number_field(ui, Id::unique(("fx_gl", i)), Lead::Text(tr("Light|glass")), Some(g.light_angle.round()), "°", half, 1.0);
+                let ed = fx_field_in(app, ui, ids, i, "lightAngle", Lead::Text(tr("Light|glass")), Some(g.light_angle.round()), "°", half);
                 edit(app, ed, &|v| with(&|gl| gl.light_angle = v.clamp(-180.0, 180.0)));
-                let ed = widgets::number_field(ui, Id::unique(("fx_gi", i)), Lead::Text(tr("Intensity")), pct(g.light_intensity), "%", half, 1.0);
+                let ed = fx_field_in(app, ui, ids, i, "lightIntensity", Lead::Text(tr("Intensity")), pct(g.light_intensity), "%", half);
                 edit(app, ed, &|v| with(&|gl| gl.light_intensity = unit(v)));
             });
             row(ui, 32.0, |ui| {
-                let ed = widgets::number_field(ui, Id::unique(("fx_gr", i)), Lead::Text(tr("Refraction")), pct(g.refraction), "%", half, 1.0);
+                let ed = fx_field_in(app, ui, ids, i, "refraction", Lead::Text(tr("Refraction")), pct(g.refraction), "%", half);
                 edit(app, ed, &|v| with(&|gl| gl.refraction = unit(v)));
-                let ed = widgets::number_field(ui, Id::unique(("fx_gd", i)), Lead::Text(tr("Depth")), Some(g.depth), "", half, 1.0);
+                let ed = fx_field_in(app, ui, ids, i, "depth", Lead::Text(tr("Depth")), Some(g.depth), "", half);
                 edit(app, ed, &|v| with(&|gl| gl.depth = v.clamp(1.0, 1000.0)));
             });
             row(ui, 32.0, |ui| {
-                let ed = widgets::number_field(ui, Id::unique(("fx_gs", i)), Lead::Text(tr("Dispersion")), pct(g.dispersion), "%", half, 1.0);
+                let ed = fx_field_in(app, ui, ids, i, "dispersion", Lead::Text(tr("Dispersion")), pct(g.dispersion), "%", half);
                 edit(app, ed, &|v| with(&|gl| gl.dispersion = unit(v)));
-                let ed = widgets::number_field(ui, Id::unique(("fx_gf", i)), Lead::Text(tr("Frost")), Some(g.frost), "", half, 1.0);
-                edit(app, ed, &|v| with(&|gl| gl.frost = v.clamp(0.0, 1000.0)));
+                let ed = fx_field_in(app, ui, ids, i, "radius", Lead::Text(tr("Frost")), Some(g.sanitized().frost), "", half);
+                edit(app, ed, &|v| with(&|gl| gl.frost = v.clamp(0.0, Glass::MAX_FROST)));
             });
             row(ui, 32.0, |ui| {
-                let ed = widgets::number_field(ui, Id::unique(("fx_gp", i)), Lead::Text(tr("Splay")), pct(g.splay), "%", half, 1.0);
+                let ed = fx_field_in(app, ui, ids, i, "splay", Lead::Text(tr("Splay")), pct(g.splay), "%", half);
                 edit(app, ed, &|v| with(&|gl| gl.splay = unit(v)));
             });
         }

docs/components-parity.md

@@ -1,6 +1,6 @@
 # Components, variants, styles and variables parity
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-11-01 · **Change:** minor (Delete on a layer inside an instance hides it as an override instead of being refused, as the help center says: "Figma will only toggle the layer's visibility instead of removing it"; library analytics list how many layers and files use each style and variable; SwiftUI and Compose code names a bound variable by its iOS or Android code syntax; library analytics count insertions and show insertions and detachments over the past 30 days, 90 days or year; a collection of this file can be extended (Extend collection on its row, `variable.extendCollection`), its extension following its edits at once, and extended collections extend again in the file; a typed or stored variable, collection or mode id names only the object with that id (#1613); colour variables can be calculated from other colours per mode — `{alpha}` replaces a colour's alpha, `{mix}` blends two — and follow them (#1280); stored variable and collection references keep their identity when another object is named like their id (follow-up to #1542); a component set's property rows fit the 240 px right panel: variant values wrap two to a line there and every + and − stays in view; opening a file contacts no team library server it names until you check it (#1097); an explicit variables file path (`variable.import`, the `variables` of `file.open` and `file.import`) is refused past 256 MiB or when it isn't a regular file, as the sibling `variables.json` already was (part of #1114); component properties keep the order they were made in when one is renamed, and Make slot asks for the slot's name first (#1536, #1537); components can't contain their own instances, directly or through others (#1084); the instance-swap menus have a search field (#1338); an instance-swap property's default menu scrolls (#1338); variables on a text style's fields from the style editor; instance-swap properties in the component playground; duplicating or Alt-dragging a main component makes an instance of it (#892); a bound colour variable's alpha applies once (#802); variables import reads `variables` outside `meta` and warns when it imports none (#790); variant properties reorder by drag; library files saved right after a read are read again; Hide when publishing note corrected; size and resizing overrides of layers inside instances (#731); variables export in the browser as a download; core editor leftovers: component playground, variables inside styles; layers and assets panels behaviour suite and fixes; extended collections tail; styles and variables behaviour suite and fixes; components behaviour suite and fixes; team libraries on the server, library usage and swapping a library; extended collections, variables import/export, gradient stops and variant properties bound to variables) · **Target:** Figma Design (desktop app 126.10.7)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-11-02 · **Change:** minor (glass effects take variables; Delete on a layer inside an instance hides it as an override instead of being refused, as the help center says: "Figma will only toggle the layer's visibility instead of removing it"; library analytics list how many layers and files use each style and variable; SwiftUI and Compose code names a bound variable by its iOS or Android code syntax; library analytics count insertions and show insertions and detachments over the past 30 days, 90 days or year; a collection of this file can be extended (Extend collection on its row, `variable.extendCollection`), its extension following its edits at once, and extended collections extend again in the file; a typed or stored variable, collection or mode id names only the object with that id (#1613); colour variables can be calculated from other colours per mode — `{alpha}` replaces a colour's alpha, `{mix}` blends two — and follow them (#1280); stored variable and collection references keep their identity when another object is named like their id (follow-up to #1542); a component set's property rows fit the 240 px right panel: variant values wrap two to a line there and every + and − stays in view; opening a file contacts no team library server it names until you check it (#1097); an explicit variables file path (`variable.import`, the `variables` of `file.open` and `file.import`) is refused past 256 MiB or when it isn't a regular file, as the sibling `variables.json` already was (part of #1114); component properties keep the order they were made in when one is renamed, and Make slot asks for the slot's name first (#1536, #1537); components can't contain their own instances, directly or through others (#1084); the instance-swap menus have a search field (#1338); an instance-swap property's default menu scrolls (#1338); variables on a text style's fields from the style editor; instance-swap properties in the component playground; duplicating or Alt-dragging a main component makes an instance of it (#892); a bound colour variable's alpha applies once (#802); variables import reads `variables` outside `meta` and warns when it imports none (#790); variant properties reorder by drag; library files saved right after a read are read again; Hide when publishing note corrected; size and resizing overrides of layers inside instances (#731); variables export in the browser as a download; core editor leftovers: component playground, variables inside styles; layers and assets panels behaviour suite and fixes; extended collections tail; styles and variables behaviour suite and fixes; components behaviour suite and fixes; team libraries on the server, library usage and swapping a library; extended collections, variables import/export, gradient stops and variant properties bound to variables) · **Target:** Figma Design (desktop app 126.10.7)
 
 Design systems are why teams adopt Figma. **Components: breadth ~96%, ready ~72%. Styles and
 variables: breadth ~95%, ready ~76% (estimated).** QA'd with a synthetic design system of ~300
@@ -67,7 +67,7 @@ updates with overrides kept: `library_tests.rs`, `components_scale_tests.rs`.
 | Modes: add, duplicate, rename, delete, set as default / reorder | done | layers on Auto follow a new default; explicit modes stay |
 | Deleting a bound variable or its collection | done | layers keep their last value and are unbound; aliases to it take its values and colour calculations reading it keep the colour they show |
 | Code syntax per platform (Web, iOS, Android) | done | generated CSS uses the Web name, SwiftUI the iOS one and Compose the Android one (a variable without one keeps its value there); in the variables JSON; ArkUI and Flutter have no platform of their own and write values |
-| Bindings: fills, strokes, effects, opacity, padding, gaps, sizes, radius, font family/style, font size/weight, line height, letter spacing, paragraph spacing/indent, text, visibility, layout grids, instance properties | done | type-checked per field; number variables fill text content; the Design panel's font family and font style menus start with Apply variable (string variables), and a bound one shows its variable in place of the menu; a colour variable bound to a solid paint brings its whole colour, alpha included, once (the paint's opacity restarts at 100% on binding, an opacity set while bound multiplies on top; unbinding moves the alpha back into the opacity) |
+| Bindings: fills, strokes, effects, opacity, padding, gaps, sizes, radius, font family/style, font size/weight, line height, letter spacing, paragraph spacing/indent, text, visibility, layout grids, instance properties | done | type-checked per field; glass fields too (light angle, intensity, refraction, depth, dispersion, frost and splay, percentages as the Design panel shows them); number variables fill text content; the Design panel's font family and font style menus start with Apply variable (string variables), and a bound one shows its variable in place of the menu; a colour variable bound to a solid paint brings its whole colour, alpha included, once (the paint's opacity restarts at 100% on binding, an opacity set while bound multiplies on top; unbinding moves the alpha back into the opacity) |
 | Explicit modes per frame, library collections' modes | done | stored variable and collection references resolve by exact id in export, library copies and swaps, imported aliases, alias deletion and cycle checks, Dev Inspect, the library mode picker and prototype playback; a collection or variable named like another's id no longer stands in for it there |
 | Gradient stops and variant properties bound to variables | done | a stop's binding follows it when earlier stops are removed |
 | Extended collections | done | this file's collections (Extend collection on a collection's row; following its edits at once, chains included) and library collections, including a library's own extended collections (chains through libraries); overrides per mode with reset; follow library updates, variables new to the library collection being an update of their own; modes inherited. Checked with synthetic libraries only ([gaps](gaps.md) #14) |
@@ -78,6 +78,7 @@ updates with overrides kept: `library_tests.rs`, `components_scale_tests.rs`.
 
 | Date | Change | Summary |
 |---|---|---|
+| 2026-11-02 | minor | M3, #1885: glass effects take variables, as the reference tool's do: its light angle, intensity, refraction, depth, dispersion, frost and splay bind to number variables on a layer (`variable.bind`, `effects/<i>/<lightAngle\|lightIntensity\|refraction\|depth\|dispersion\|radius\|splay>`, `radius` being the frost) and in an effect style (`style.bind`), and the Design panel's glass fields take a variable like the shadow and blur fields. A variable reads as the field shows it: intensity, refraction, dispersion and splay in percent. Tests: `binding_lists_tests::glass_fields_take_number_variables`, `effects_tests::glass_fields_take_bound_numbers_as_the_panel_shows_them`. Grade unchanged. |
 | 2026-11-01 | patch | M3: Delete on a layer inside an instance hides it (an override) instead of being refused ("You can't delete a layer or object from an instance. If you try, Figma will only toggle the layer's visibility instead of removing it", Guide to auto layout); `edit.delete` reports those ids under `hidden`, the structure and the main component stay as they were, one undo step; deleting the instance itself still removes it. Found by a documentation audit of the auto layout page. Test: `components_behaviour_tests::deleting_a_layer_inside_an_instance_hides_it_instead` (the refusal row for it is gone from `what_instances_cannot_override_is_refused`). Numbers unchanged |
 | 2026-10-31 | minor | M3, gap 10: library analytics cover styles and variables. A file reports how many of its layers use each of a library's styles and variables, and Show usage (`library.usage`) lists them beside the components, by a Type choice, with their layers and files. Layers inside instances count for their component. Insertions, detachments and modes aren't counted for them yet. Numbers unchanged. Tests: `library_assets_tests`. |
 | 2026-10-31 | minor | M6: as the help center describes code syntax, Dev Mode's SwiftUI and Compose code now writes a bound variable's iOS or Android code syntax in place of its value, as CSS already wrote the Web one: fills, strokes and their weight, sizes, corner radius, gaps, padding, opacity, the font family and size and the characters. A variable with no code syntax for the platform keeps the value, since a name made up here wouldn't exist in the code it lands in. ArkUI and Flutter have no code syntax platform and are unchanged. Test: `variables_behaviour_tests::swiftui_and_compose_name_variables_by_their_code_syntax`. Numbers unchanged. Grade unchanged |