This error message means that the photons emitted by the light source don’t hit any energy-storing object. The problem is
one of the following:
- objects in the path of photons don't have photon shaders in the materials or don’t have photon shaders that always absorb
photons.
- the receiving object has a strange shape as seen from the light source and mental ray for Maya is casting rays in places where
they cannot be stored.
- the photon emitting light source is emitting photons in the wrong direction.
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