View Full Version : [3DSMAX - Vray] Rendering through glass

02 February 2012, 07:27 PM
First of all, hey everybody

Hope I didn't not mistake in posting here.

Here's my problem :

I'm rendering an interior of a "glass bulb", so nearly all the light pass through glass.
The windows have some thickness. ( (

I don't understand because, from the interior, it won't let pass sufficient light, and i have these weird reflections on the "inner door" (maybe because it is 2 glasses stacked up)
From the exterior, the render just seemed too much burnt.

It was just rendered with two Vray planed light + GI , but I've tried with the daylight system, and i have the same issues. I've tried with simple glass texture, and aswell with another i've downloaded on vray materials.

If anyone has a clue, that would be very appreciated,


02 February 2012, 10:40 PM
I guess you don't use the Vray physical camera.

Give it a try and adjust the f-stop value to get more light inside.

02 February 2012, 09:45 AM
I guess you don't use the Vray physical camera.

Give it a try and adjust the f-stop value to get more light inside.

I'm not so sure about that - the sky should be blown out too, if that's the case. Though it certainly appears that the exterior is without any exposure control.

OP, there are a few issues that it could be, but firstly I'd try ramping up all of the values that control the number of refracted objects that light trances through, in the GI settings (refractive caustics, bounces up), in the glass material settings (max depth) and in the VRay Global Switches parameter too (max depth). If it then renders OK, you can go back through these settings and lower them until you stop getting the result you want, then finally go back one. Turning these up dramatically increase your render times, but in objects with glass - especially two sets of glass! - you need a lot. For two glass "domes", you'll need at least 4 just for the rays to get through the glass, let alone anything else!

03 March 2012, 02:04 PM
that is indeed weird...

Are you using the same camera settings for both renders?
Are your glass normals correct?

03 March 2012, 03:04 PM
Thank you for your answers, it was indeed a problem with my vray physical camera sitting, but all the others answers will help me have good results with glass.


03 March 2012, 03:43 AM
i think try dont cast shadow on obj property on surface glass will do the trick..

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