looking throug a glass window; mirrors behind do not reflect

[davehitt]

Hi there --

I am rendering the interior of a fitness center, as seen through a piece of floor to ceiling glass. The glass is comprised of a box and is textured with vray glass. The mirror, likewise, is a Vray material, with 100% reflectivity.

When I render the scene with the glass window present, the mirrors reflect nothing and show up black. When I hide the foreground window, everything works just fine. I can obviously solve this by comping in layers, but I'd like to figure out what I'm doing wrong. I've tried various permutations of turning on "reflect on back side" "double-sided" etc. No combination I've hit on seems to work.

Please, someone, tell me how I need to handle this to get physically correct results...

Thanks,

dave

[CCS]

Check the max bounces of your glass and mirror mats, as well as the max bounces in the global overrides.

[davehitt]

bounces

Ummm; okay, but can you give me an idea of what they should be, in order to ensure correctness? I've always left them at defaults...

thanks

[flipside]

No we can not, it depends on how many refractive and reflective parts you are looking at.

Just increase them until the mirror isn't black anymore.

If you want physical correct, increase them to 1000 or something But I don't wanna know your rendertimes then...

16 is usually more than high enough though.

[davehitt]

1000 times?

Haha.

Thanks a bunch; I'll try your suggestions!

dave