Skew perspective for a top-down view

[klavinski]

I would like to skew the perspective like A link between worlds:

But I would like to keep the geometry correct for shaders (shadows, light…). How to do it?

[makc3d]

maybe add local y * 0.02 to transformed y, for example - using material.onBeforeCompile

[klavinski]

I have never used onBeforeCompile. Can you give an example?

[makc3d]

something like this.

[Chaser_Code]

Maybe its postprocess like glitch or underwater. Or you add custom postprocess shader
https://threejs.org/examples/webgl_postprocessing_glitch.html

[makc3d]

sorry I have missed this part:

@klavinski

But I would like to keep the geometry correct

this is the opposite of what onBeforeCompile would do

then, you can limit the camera to show only the top part, where things get naturally skewed - for example like this