Three.js: Cast LightShadow to ShadowMaterial

问题

I want to capture the shadow created by a PointerLight to a ShadowMaterial. A MeshPhongMaterial will capture the shadow of the PointerLight but a ShadowMaterial will only capture shadows from objects that are in the scene. Is this possible?

来源：https://stackoverflow.com/questions/54000003/three-js-cast-lightshadow-to-shadowmaterial