vray rendering

[gurami]

Hi I am havin some trouble with vray rendering.

I am using skylight only and there is big round shade on my model.

(1st image)

This only happens when I am using glass materials.

But the part inside the circle is more satisfying than outside.

When I turn off the reflection/refraction on global switches

it is gone but all my glass material turn black.

(2nd image)

 

Also why is it so greyish when the enviroment color is pure white?

and those black colors and burnouts.. how do I get rid of them?

Sorry for lot of questions I am new th vray.

Any help will be great. Thanks.

 

[ATTACH]30848[/ATTACH]

 

[ATTACH]30849[/ATTACH]

[jophus14]

There is a ton of info that you need to clarify. Why did you decide to use a skylight? Your best bet is set the environment to white and set the multiplier to 1.0 in the Vray Environment dropdown box. I'm not sure about the shadow, but posting your glass material settings will help us out. Is the model imported from another software package? If you wanted to, zip your scene and i can check it out for you.

[gurami]

Hi I meant environment lighting by skylight, sorry for confusion

and it is set to 1.0

Attached is zip file of my scene.

Would be great of you could have a look.

Thanks

[jophus14]

I went through your scene. What software was the original model created in? I didn't have any of the problems that you had displayed in your attachments. I did notice that only one section of your glass rendered like it was supposed to. The other sections rendered with full reflectivity. I switched your frosted material to mine and it acted the same way which leads me to believe that its the geometry. Some of the balcony glass geometry on the side of the building where made up of three pieces of geometry which isn't good because it was overlapping which would cause burnouts. I used a vraysky just for reflection purposes and added a blue color to represent a water material just for testing. Check out the attachment for other notes.

Edited January 18, 2009 by jophus14

[arkiedmund]

based from what jophus14 has said, if could probably be a geometry problem. Will try to check your scene file. And see, what we can do for you.

 

edit: After checking your file, I saw that the models are composed of polyface mesh.

 

Care to provide us with info on what software was used in creating the model? I am also suspecting it is a geometry issue.

 

Hope this helps.

Edited January 20, 2009 by arkiedmund

[Craig Ramsay]

Not had a chance to check out the model file but I do see some black areas inside the building, I think this is caused by coplanar faces (one face in exactly the same position as the other). You need to go through your model and delete any coplanar faces to resolve that issue.

[gurami]

Thanks for all the help.

I found out it was the geometry problem.

I used AutoCAD to draw up 2d document which wasnt well drawn

then extruded in 3dmax which caused bad geomtries.

 

Just one thing, when I am rendering, I find some burn outs or blacks

where some geometries are overlapped. Is there any way I could

get rid of them with out deleting overlapped geometries?

 

Thank you

[kippu]

you can up/increase the secondary ray bias up so slightly ..like 0.01

[jophus14]

Just one thing, when I am rendering, I find some burn outs or blacks where some geometries are overlapped. Is there any way I could get rid of them with out deleting overlapped geometries? Thank you

 

You don't have to delete the geometry. Just move your vertices over so they do not intersect. If the piece is right up against another, just move it out ever so slightly and the problem will be fixed.