Is it possible to make the mesh visible to the light, but invisible to the camera?
This is necessary in order to receive secondary reflections on the object, and the environment itself must be invisible. In Сycles, this can be done with the help of such a bunch of nodes.
Invisible to the camera mesh
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Please upload a testscene that allows developers to reproduce the problem, and attach some images.
Please upload a testscene that allows developers to reproduce the problem, and attach some images.
Re: Invisible to the camera mesh
Yes, there is an object flag (i.e. it is an object attribute, not a material one):