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KenM76andClaude Opus 5.5
ca21d4fb7b
normalize already scales by the largest component, but the face normal was the normalized cross product of two edges, and edges near 1e160 overflow that product to infinity first, so the triangle was dropped. unit_cross divides both edges by their largest component before the cross product. a_huge_square_is_drawn fails with the old line (white instead of [190,192,200]). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01SqmHYx8FiWM5PcsoiErgp9
pdfcraft-prc-render
A headless CPU renderer for PRC 3D models read by pdfcraft-prc: placed meshes in world space, a fitted camera, a
depth-buffered triangle fill and headlight shading, into a straight-RGBA image.
- Layer: L3. Depends on
pdfcraft-prconly. - Licence: MIT OR Apache-2.0.
#![forbid(unsafe_code)]. Never panics on input: image size, triangle count and every index are checked, and damage returnsRenderError.
API
assemble(&PrcFile) -> Result<Vec<WorldMesh>, RenderError> // every placement's mesh moved into the world and coloured
place(&TriangleMesh, &Matrix, colour, triangle_colours) -> WorldMesh
Camera::fit(&Bounds, direction, up, perspective, aspect) / Camera::fit_meshes(&[WorldMesh], ...)
render(&[WorldMesh], &Camera, &RenderOptions) -> Result<Image, RenderError>
- With no product tree, each tessellated mesh is drawn where it lies, in the default colour.
- A triangle's own colour wins over its mesh's, which wins over
RenderOptions::colour. - Opaque triangles are drawn first, then translucent ones blended over them; alpha 0 is not drawn.
Lighting::Headlight(default) shades by the angle to the view direction;Lighting::Unlitdraws flat colour.- Perspective triangles are clipped at a near plane 1/10,000 of the eye-to-target distance from the eye; orthographic views are not clipped.
MAX_RENDER_PIXELS(2^24, about 16 MP) bounds the image: at most 64 MB of RGBA plus 128 MB of depth.MAX_ASSEMBLED_TRIANGLESandMAX_ASSEMBLED_VERTICES(2^24 each) bound oneassemblecall. None bounds time: a model of many large triangles at full size is a long CPU render, so callers on a UI thread should render small or off-thread.- Not yet: shadows, ambient occlusion, specular light, scene lights, textures, wires and markups.