Annotations

shaders/happy-accident/shader.slang

@@ -36,6 +36,8 @@ float4 shadeVideo(ShaderContext context)
 	float4 accumulated = float4(0.0, 0.0, 0.0, 0.0);
 	float clampedSteps = clamp(raySteps, 1.0, 77.0);
 
+	// Ray-march a folded procedural field. distanceToSurface advances the ray,
+	// while inverse-distance accumulation creates the glowing filaments.
 	for (int i = 0; i < 77; ++i)
 	{
 		if (float(i) >= clampedSteps)
@@ -49,11 +51,14 @@ float4 shadeVideo(ShaderContext context)
 		position.xy = mul(rotateAroundZ(2.0 + originalPosition.z), position.xy);
 		position.xy = mul(happyAccidentMatrix(originalPosition, timeCos), position.xy);
 
+		// Color comes from pre-fold space so the palette varies smoothly even as
+		// the geometry folds into repeated cells.
 		float colorSeed = 0.5 * originalPosition.z + length(position - originalPosition);
 		float4 palette = 1.0 + sin(colorSeed + float4(0.0, 4.0, 3.0, 6.0));
 		palette /= 0.55 + 1.55 * dot(originalPosition.xy, originalPosition.xy);
 
 		position = abs(frac(position) - 0.5);
+		// Distance to a tiny box/cross primitive inside each repeated cell.
 		distanceToSurface = abs(min(length(position.xy) - 0.125, min(position.x, position.y) + 0.001)) + 0.001;
 		accumulated += palette.w * palette / distanceToSurface;
 	}