Add better color output

src/graphics/graphics-library/program/uniform-array-autoscaling-program.ts

@@ -135,7 +135,22 @@ export class UniformArrayAutoScalingProgram implements IProgram {
           return '';
         }
 
-        return `${descriptors[i].sdf!.distanceFunctionName}(minDistance, color);`;
+        return `
+          #ifndef NOT_EMPTY
+          #define NOT_EMPTY
+          #endif
+
+          objectMinDistance = ${
+            descriptors[i].sdf!.distanceFunctionName
+          }(position, objectColor);
+
+          color = mix(objectColor / {paletteSize}, color, step(
+            distanceNdcPixelSize + SURFACE_OFFSET, 
+            objectMinDistance
+          ));
+
+          minDistance = min(minDistance, objectMinDistance);
+        `;
       })
       .join('\n');
   }

src/graphics/rendering/shaders/distance-fs-100.glsl

@@ -13,10 +13,16 @@ varying vec2 position;
 {declarations}
 
 void main() {
-    float minDistance = maxMinDistance;
+    float minDistance = abs(maxMinDistance);
     float color = 0.0;
 
+    float objectMinDistance, objectColor;
+
     {functionCalls}
+    
+    #ifndef NOT_EMPTY
+    minDistance = maxMinDistance;
+    #endif
 
     // minDistance / 2.0: NDC to UV scale
     gl_FragColor = vec4(minDistance / 2.0, color, 0.0, 0.0);

src/graphics/rendering/shaders/distance-fs.glsl

@@ -15,11 +15,17 @@ in vec2 position;
 out vec2 fragmentColor;
 
 void main() {
-    float minDistance = maxMinDistance;
+    float minDistance = abs(maxMinDistance);
     float color = 0.0;
 
+    float objectMinDistance, objectColor;
+
     {functionCalls}
 
+    #ifndef NOT_EMPTY
+    minDistance = maxMinDistance;
+    #endif
+
     // minDistance / 2.0: NDC to UV scale
     fragmentColor = vec2(minDistance / 2.0, color);
 }