architectural glass...how to improve?

[fabrizio]

thanx


fabrizio

[zoranm]

Flipside

As I said above:

"1. I often get from architects half-backed models with single planes for glass
1a. It's one of my Standard Library Materials. "

I had some problems with single plain glass and Vray material in the past

But you are right. There is no reason why vray material can't be used!


Zoran

[flipside]

Yeah I read that, but I was interested in the difference between std and vraymtl on single plane glass.

[paulison]

This thread has helped me a lot with something very basic....

All of my recent work has been rendering with glass that is very reflective but dark and not able to see through the glass inside.

simply ticking fresnel reflections and increasing the amount of reflection on the glass seems to produce good results...similar to egz glass. So i'm guessing Egz glass uses freznel reflections?

I just thought I would share my little learning experience so that people dont waste their time trying to do glass without freznel reflections.

My second issue continues to be shadows being too dark, so when the sun goes through the glass, there appears to be a very small amount of GI bouncing going on. Increasing skylight effects the building exterior but the interior still isnt getting enough light. Could this be due to the glass being 10mm thick? Possibly it is my settings? I am using irradiance mapping with QMC secondary (8 subs, 5 bounces) on high presets with HSV colourmapping 0.9,/0.9. Maybee the most obvious thing is that i require internal lighting....? Maybee My internal wall material GI contribution could be raised? Does anyone have any other suggestions?

[flipside]

Does your sun have vray shadows? You should check 'affect shadows' in glass material so that direct light goes trough the glass. Make sure you have 'gi caustics' on so that indirect light (skylight etc) passes trough also.

The easiest solution to let light go trough is by settings object properties of the glass to not cast shadows. Also in the vrayproperties of the glass untick 'visible to GI'. This way, all light passes trough the glass without loosing strength, it's as if the glass isn't even there. This also renders a lot faster (especially on interiors).