wierd reflections in glass

[FOB]

I'm pretty new to vRay and I'm having a heck of a time getting the glass reflections right.

A description of the problem (sorry - can't upload to a site):

I have quite a simple setup. A curtain wall of glass using the glass material from the vRay library. Opposing that wall there's some things that should be reflecting. The reflection looks pretty decomposed. Large squares all over blocking the reflection on the glass and other squares letting the reflection through. Totally useless. The scene is lit with an HDRi and a vRay light.

The geometry is two planes offset 2,5cm to each other. The normals pointing outward. I have moved the model so 0,0,0 is in the middle as was mentioned in another posting here - didn't help. I have tried moving the glass object slightly - didn't help. I have tried turning up the number op interpolation samples on the glass materials reflection and the refraction - didn't help.

If anybody has input I would greatly appreciate it.

[natty]

i think what your problem is that you are using two planes as glass ?
rather than planes use to boxes with the proper thickness of your glass, so the light can go into the glass and bounce around.

hopefully that should solve your problem.

p.s .... welcome to the forum

Regards

[FOB]

thanks for your prompt response.

the glass actually started out as boxes as you described. reducing the glass object to two parallel planes was just another thing I tried to remedy the situation.

[vince_1972]

Take my post :
http://www.chaoticdimension.com/foru...pic.php?t=6329

regards

Vince

[natty]

Totaly forgot about that post

[FOB]

hmmm.... i see. thanks for the replies.

remodeling is out of the question due to time so it looks like i'll use another program to render it. vRay has wasted quite alot of my time so far but i guess that's one of the joys of learning.

[Da_elf]

all you need to do is turn off the reflect on back side option. and why would remodeling the glass take so long? isnt that the only thing that was messing up? an image of your setup and scene would help us see the problem

[FOB]

i've tried that - didn't help. it's a curved facade and instead of using more time on a program that has let me down 2 out of 2 times i'd rather play it safe with Lightscape and get back to vRay when they get the bugs fixed.

by the way: in vinces post someone mentioned there was a bug in version 1.45.20. as far as i know the latest version is 1.09.03r. am i missing something??

[peter008]

get free webspace, will help to solve future problems faster.

1.0.9.03r is the latest none internal version, afaik.

if you have 1.45.x.x you should know this.
and if so.... don´t use internal beta builds for running projects.

[dbuchhofer]

Large squares all over blocking the reflection on the glass and other squares letting the reflection through. Totally useless

You have 2 planes of glass in the same physical space. Thats an effect that happens often with vray when you have cooincedent faces.

[FOB]

there are no coincident faces. that was one of the first things i checked for.

[vance3d]

its to bad you can't upload an image or the scene file itself.

I ran into something similar recently. Nothing I knew seemed to apply.
I checked to see if there were coincident faces and there were none. I checked the vray raytrace settings and everything was fine. Then I checked to see if there were frozen objects in the scene that did not show in the view port. Ah hah, I had continued work on a file someone else had started and they had the "hide frozen objects" box checked. These frozen objects did not show in the view port but they most certainly showed in the render. Coincident faces! After deleting the frozen objects everything was fine.

V Miller

[trixian]

i've tried that - didn't help. it's a curved facade and instead of using more time on a program that has let me down 2 out of 2 times i'd rather play it safe with Lightscape and get back to vRay when they get the bugs fixed.

These "bugs" don't seem to bother other users. Have you never seen any renderings from vray with the same type of glass setup you are using? Did those renders look bad? Are you trying something nobody else has ever tried to render?

[FOB]

trixian : if you read further up in the thread you will find this link :

http://www.chaoticdimension.com/foru...pic.php?t=6329

regarding a refraction bug so i guess i'm not the only one

[peter008]

Are you trying something nobody else has ever tried to render?

thats the reason why he can not show the image.
he is under NDA.

no honest, it´s not such a big deal so it should work if your geometry is right.