How to correct texture mapping on arbitrary quadrilaterals ?

Questions & Answers
1

Hello ! I’d like to apply a texture on an arbitrary 4 vertices mesh to get this kind of result:

beuah
instead of:
that's better!

I found some interesting posts on the forum providing a Shader that seems to work well with trapezoids but not that good with other arbitrary quadrilaterals. ( Right there → https://forum.unity3d.com/threads/correcting-affine-texture-mapping-for-trapezoids.151283/ )

Here are the results using this shader script.
I’m not sure if it’s actually possible to edit the code to reduce this distortion.
I also found this article talking about an openGL solution but not being familiar with these concepts nor with Shader programming, I have no clue how to connect the dots.

I would appreciate any thoughts, recommendations on a way to do this (preferably using shaders or gpu calculation, to be as time-efficiently as possible).

Thanks a lot !

3

If you found this question by Google, this link leads to the solution:

2

I couldn’t find any solution… Do you have any idea ?