Is it possible to make a specific object not self-shadow?
For example, in the following codepen, the Plane has a shadow artefact. It is using a modified version of Three.js (see pull request) where Planes are not rendered reverse-sided so that they cast shadows.
I could try modifying light shadow bias, to reduce the artefacting, but this gives the shadows unwanted distance from their objects:
In this case, I believe that if I could simply turn of self-shadowing for the planes, then the problem would be gone without introducing other artefacts.
Is there a way to make an object (f.e. a flat Plane) not shadow itself but still cast shadows?