Hello!
The regular ContactShadow provided with ThreeJS doesn’t work for XR, so this is my implementation.
Nothing fancy, I’ve just copied the code from the “official” version https://threejs.org/examples/webgl_shadow_contact.html and I’ve changed it quite a bit to work for XR. Performances where a issue, but I’ve implemented some optimizations and actually it work quite smooth on my old Galaxy S10 (with blurred shadow and a lot of geometry too). Any upgrade that you like to share will be much appreciated!