You might find this post useful
In a nutshell. As long as the number of colors is limited, you can do it quite easily. For more complex cases you probably need to generate the heat map outside SketchUp and apply it as a texture.
You might find this post useful
In a nutshell. As long as the number of colors is limited, you can do it quite easily. For more complex cases you probably need to generate the heat map outside SketchUp and apply it as a texture.