Hello,

  is any way how to not use max_trace_level when object has ior=1? It 
can be very useful for scenes where you have for example 200 bitmap 
trees on polygons at one side of road and some glass things. When you 
set max_trace_level too low, you will get errors at polygons with trees. 
When you set max_trace_level to neccesasry value for trees (200, in this 
   case and worst camera setttings), the glass will render 
unneccessarilly slow.

   I think, that there is no reason why use max_trace_level for objects 
with ior=1 and no reflection, because there is no way how to reach 
infinite depth of raytracing, as in the case of glass box with ior != 1.

Regads

Vaclav

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