update

resources/shaders/mm_contour.fs

@@ -0,0 +1,11 @@
+#version 110
+
+const float EPSILON = 0.0001;
+
+void main()
+{
+    gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0);
+    // Values inside depth buffer for fragments of the contour of a selected area are offset
+    // by small epsilon to solve z-fighting between painted triangles and contour lines.
+    gl_FragDepth = gl_FragCoord.z - EPSILON;
+}