How to assign the texture of mirrortexture to shader ？

[ecojust]

Custom transparent ground that receives shadows, show mirror and use diffuseTexture

I think what you want is to keep the shadow and the mirror and have everything else transparent? Maybe this will work for you: https://playground.babylonjs.com/#9KLUBA#4 If the shadow variable is strictly less than 1 it means the pixel is at least partly in shadow. And the if (color.r != 0.2 || color.g != 0.2 || color.b != 0.3) check is to test against the clear color.

Maybe CustomMaterial is a good solution for it .