Hello. I need someone to advise me about a gradient shading using multiple vertex data.
Let’s say I have three meshes (see Picture 1) that Mesh 3 is enclosed by Mesh 2 and Mesh 2 is enclosed by Mesh 3 and all the meshes are convex.
Each mesh is extruded from 2D sketch (so think it as a problem of coloring a plane) with same height and shape of them are dynamically changing, while keeping the relationship of including like I described above.
What I want to do is shading Mesh 1’s color smoothly changing over the region defined by enclosed mesh. For example, like Picture 2. (The innermost object will be shaded without gradient)
I think the equation I wrote in Picture 1 is reasonable for fragment shader. What I don’t know is how to pass external vertex data into shader. If it is possible, the problem will be much easier.
If it is not possible, I have a vague idea about making a mask of Mesh 2 & 3 in real-time. Can it be an option?
Any idea about implement it in a clever way?