how to get the light rays for the lamp?

[niegrau]

I try to do a draft render with no GI at all, but only VrayLight (placed in the lamp- Mesh type).

in the view port (set to: scene light with shadows enabled) this is what I get - see the image below

 

but after I render out, I get the ambient light probably from the vRay Exp. Control. What Im trying to achieve is the lightrays of the lamp just as shown in the view port. a downward set of rays with a high temperature light. what do you think is the problem?

 

I have tried this render with GI enabled as well, but it just gives illuminance to the whole. what's hard to get is the rays just like the action of real world downward lamps.

 

 

View Screen Capture

[Cad64]

The problem is not with your light, it's with the material you have applied to the lamp shade. You need to set your lamp material to be 2 sided so that the light does not emit out through the lamp shade. The renders below were done with Mental Ray, but the same principle applies.

[tzframpton]

Wow great tip Cad64!! I never realized that. Good stuff

[niegrau]

I just checked it was set to 2 sided but I anyway tried it with Vray2SidedMaterial as well, it's still the same. what's obvious here in this case is that the light is hidden in the render. what's the way to fix it? it seems that renderer takes it into as a hidden light so it doesnt shown it in the final image. I looked up every vray parameters in the render setup, I enabled all the options for hidden objects to be rendered. but no result !

[Cad64]

Well, you could try using a spotlight then, instead of an area light. I'm not familiar with Vray though, so I can't really offer any further assistance, and I don't think we have any Vray experts here?

 

There is a Vray forum over at CGArchitect that is fairly active. You might want to sign up and post your question over there: http://forums.cgarchitect.com/99-v-ray/

 

Good luck, and let us know if you figure out how to fix this problem.