much easier to see now...

src/core_types.rs

@@ -18,6 +18,24 @@ impl RgbaF32 {
       alpha: 1.0,
     }
   }
+
+  pub fn rgb(r: f32, g: f32, b: f32) -> Self {
+    Self {
+      red: r,
+      green: g,
+      blue: b,
+      alpha: 1.0,
+    }
+  }
+
+  pub fn gray(gray: f32) -> Self {
+    Self {
+      red: gray,
+      green: gray,
+      blue: gray,
+      alpha: 1.0,
+    }
+  }
 }
 
 #[cfg(test)]
@@ -32,4 +50,13 @@ mod test {
     assert_eq!(black.blue, 0.0f32);
     assert_eq!(black.alpha, 1.0f32);
   }
+
+  #[test]
+  pub fn test_gray() {
+    let gray = RgbaF32::gray(0.5);
+    assert_eq!(gray.red, 0.5f32);
+    assert_eq!(gray.green, 0.5f32);
+    assert_eq!(gray.blue, 0.5f32);
+    assert_eq!(gray.alpha, 1.0f32);
+  }
 }

src/graphics_imgui.rs

@@ -58,7 +58,7 @@ pub fn run(capture_provider: Arc<MultiDeviceCaptureProvider>, calibration_data:
 
   let colorization_strategy = ColorizationStrategy::Color;
 
-  let clear_color = RgbaF32::black();
+  let clear_color = RgbaF32::gray(0.5);
 
   let mut visualizer = PointCloudVisualizer::new(
     capture_provider.get_num_cameras(),

src/point_cloud/point_cloud_renderer.rs

@@ -512,9 +512,7 @@ impl PointCloudRenderer {
       (1, 2)
     };
 
-    unsafe {
-      gl::UseProgram(self.shader_program_id);
-    }
+    //let (lower_range, upper_range)  = (0, 2);
 
     //for i in 0 .. self.num_cameras  {
     for i in lower_range .. upper_range {