Updating shadow based on vertex shader displacements

[alexolotl]

I'm morphing an object's vertices using a vertex shader in Babylon.js. The morphed object looks great, but I can't figure out a way to cause the object's shadow to update as well.

I know in Three.js there is a customDepthMaterial for a mesh where you can pass in the same custom vertex shader and correctly update the object's shadow, but is there something similar in Babylon.js? Thanks!

[Klaas]

Hi alexolotl,
babylon replaces the material when rendering the depthpass for a shadowmap. Therefore your vertex shader did not apply on the shadow pass.

Currently babylon has no method to assign custom depthMaterial (but it would be a nice to have)

The only way by now would be to customize the shadowGenerator class and the shadowVertex shader.

 

[GameMonetize]

Yep @Klaas is correct

this is the shader you need to update: https://github.com/BabylonJS/Babylon.js/blob/master/src/Shaders/shadowMap.vertex.fx