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Triangles showing up on surface between two faces

Posted: Tue Oct 30, 2012 2:51 pm
by whersmy
Hi all,

Does anyone know how to get rid of these triangles? They always show up on all my models. It happens when two faces are tangent and when I remove one face,
those triangles show up. :( It really messes up some parts, such as glass, because of the transparency the triangles are visible.

All of my models are converted solidworks parts to step, then with moi3d i convert them to .obj. I tried different export settings already with moi3d. (

This is after and before:

Re: Triangles showing up on surface between two faces

Posted: Tue Oct 30, 2012 3:33 pm
by face
Are the meshes triangulated?

face

Re: Triangles showing up on surface between two faces

Posted: Tue Oct 30, 2012 4:43 pm
by whersmy
Yes they are!

Re: Triangles showing up on surface between two faces

Posted: Tue Oct 30, 2012 5:01 pm
by blowlamp
Can you post your .obj file export settings in MoI, or maybe even the original file before export, but with the parts removed?


Martin.

Re: Triangles showing up on surface between two faces

Posted: Tue Oct 30, 2012 5:56 pm
by whersmy
Like this? Moi3D always does a good job converting the .step to .obj, but the triangles never go away!

Also here are the .obj import settings.

Re: Triangles showing up on surface between two faces

Posted: Tue Oct 30, 2012 8:59 pm
by FooZe
Hi whersmy,

Have you tried checking scene scale? (http://render.otoy.com/forum/viewtopic.php?f=23&t=21372)
Also check the distance the object is from the origin. Something might be changing the scale during modification/export.

Cheers
Chris.

Re: Triangles showing up on surface between two faces

Posted: Tue Oct 30, 2012 9:09 pm
by whersmy
Cannot believe I missed that topic. :shock:
Will check tomorrow first thing!

Thank you!

Re: Triangles showing up on surface between two faces

Posted: Wed Oct 31, 2012 3:41 pm
by whersmy
Well, so far no luck. :|

I changed the import settings to meters, but when exporting with moi3d the scale is set to mm`s.

I also tried exporting with weld vertices along edges checked, no improvement.
If i set the scale unit in moi3d to mm, then in Octane its the same right? If i set it to meters in Octane the weird circles show up.

Also tweaking with the ray_epsilon didn`t help, but I did saw the triangles going away, but then the mesh started showing artifacts.

Re: Triangles showing up on surface between two faces

Posted: Wed Oct 31, 2012 3:56 pm
by blowlamp
If you post the STEP file, it gives us something to work with.

Martin.

Re: Triangles showing up on surface between two faces

Posted: Wed Oct 31, 2012 4:26 pm
by whersmy
Here it is :arrow: