vray glass and light

[jtiscareno]

I have a small problem, I am getting some good reflections with the vray glass material and good lighting from an exterio sun source but for some reason I can't get the sunlights to come INTO the room, I can see the light but not the actual light rays, so I have to change and use a standar material with some raytrace reflection to see the sunlight come in.

 

I am guessing that I might have a setting on or off. Any ideas?

 

THX

[Ismael]

Maybe this helps, specially Gabriellas input near the end of the post.

 

http://www.cgarchitect.com/vb/showthread.php?t=10094&highlight=affect+shadows

 

Ismael

[Tim Saunders]

if you end up wanting to go back from standard mats, try not using refraction. last option, uncheck cast shadows.

[Joelp]

If you place an all black map in the opacity map slot of the V-Ray material it will allow the light to pass-through. Personally I use a Checker map with black in both slots.

[jtiscareno]

Joel thanks, but why do you use a checker map? Is it better....

[Joelp]

The only reason is that it is the first in the list of maps that only have two color slots, just the easiest one to grab.

[Tyorl]

may be I don't understand u right... but why don't u use VrayMTL with simple refraction 250;250;250. And check the Affect shadows...

[Joelp]

That is a good question? To be honest I have overlooked that check box. After looking at it, there are different effects and control you can achieve with the opacity map method.