Having a problem with rendering....first post

[Dabbsy]

Hello all

 

I am having a bit of an issue rendering in Vray.

 

I have modelled the scene in sketchup (not by choice..my company only has one license and Someone was using it) and I have imported it as a 3ds into Viz 8.

 

Some faces within the render apear to be rendering as if they have more then 1 face (are they called artifacts?). I have checked this and have even completely recreated the faces. 1 way by tracing around the shape and the other by creating a shape by border. Image attached. Does anyone know of any reason the following happens and any way around it.

 

Thanks in advance

 

Dabbsy:confused:

[Victor Erthal]

try to look for coplanar faces with the normals flipped. Also, try to add a smooth modifier to the objects, with "auto smooth" checked and a value of 30. that might help

[P.R.S. Sivakumar .]

Have a search in the Sketchup Pro forums. It will give you lot of anwers to your problems. At the moment I do not have the links.

 

Here is a link to a thread from PushPullbar2 forum

http://www.pushpullbar.com/forums/showthread.php?t=5178

 

Hope you find it useful

[alfienoakes]

What are your import settings?

 

You get the same effect if you import a CAD file into Viz, and on the import settings have "autosmooth" checked..

[jophus14]

Make sure your faces are flipped correctly and try to give the plane a slight thickness prior to exporting out of SU.

[Dabbsy]

Thanks for all your advice. I tried all your suggestion but unfortunately did not halp with my issue. I actually found that by extruding the faces which were causing a problem and then using the top face as the ground plane removed the problem.

 

Cheers

 

Dabbsy

[Joseph Petrino]

If I'm reading your problem correctly it sounds like you have coplaner faces.

 

Set your secondary ray bias (in the v-ray global switches) to greater than 0. Usually .001 or .002 will suffice.

 

This will very often solve the problem without having to correct the geometry.