Oh, sorry, I forgot to mention the colorVal, I did add the colorVal to the AXParameter, and in both ParameterGUI and AxModelInspector, I just added "p.colorVal = EditorGUILayout.ColorField(p.colorVal)". I also tried to add the gradient color to the verts, but the EditorGUILayout doesn't support the GradientField yet. I was thinking maybe combine the uv parameters and some color array will be a substitute. I'll let you know when I find out. And I just use the build-in Sprites-Default mat with the Sprite Shader, just to show the vertexColor. "The color option for parameters will be in v 1.0.11 to be released in the next couple of days" wow, it will be really sexy if the parameters can add to the spline part or even the point node and the mesh generator just read the value and interpolate the color for other verts. And for what it worth, I'm a big fan of the Archimatix and the AxTurtle is my favorite class for its name reminds me of Python and my college.