Ray stopping criteria

Criterion at which the further propagation o f a ray is dropped. For example:

• maximum allowed number of bounces is reached
• energy of a ray is below a critical value
• ray is out of bounds
  • in a sequential analysis this could mean the ray does not hit the next intended surface of a node
  • in non-sequential node this cuold be the case when a defined "out-of-bounds" surface is hit or if the ray would hit no surface at all