hector_andrade wrote:tnx guys, my machine is a p4 2.8 + 1gb ram....have a glass in windows and caustic is activate, but....i dont know, de reflexion in the glas is lost, what is the problem. the glas is glas - crown abe 56

(i forgot change to 150) and nd numbre 1.3
hector hector!
...remove glass!
...rerender!
...if monitor gamma from 2.2 reduce it to 1.7
enjoy!
About glass is glass: glass has an IOR or Abbe 1.5xx
Also glass reflectivity depends from the viewing angle, the sourounding objects and its thickness. Therefore you can not control reflectivity of glass!
People asking for an architecture glass with 100% opacity and 0-100% reflectivity but yet to come.
hope this helps,
Andronikos
http://www.ixor3d.com
VFX & 3D Anim
Renderfarm Monitor & Control Software