OTOY Forums

I have this strange triangular artifact (at the bottom of the Spider) in my render that I can't seem to get rid of. I was looking for a phong setting thinking maybe it had something to do with that but I really don't know what it is.

Any ideas?

Check your normals. If that doesn't help check your mesh (double vertices, a nasty amount of triangles connected all to that point...)

matej wrote:Check your normals. If that doesn't help check your mesh (double vertices, a nasty amount of triangles connected all to that point...)

Here is the mesh, I see what you are describing. Because this is a real part we create in a machine shop, to be accurate my current workflow is to, design the part in Autodesk Inventor, import it into 3ds Max, export it as an object, merge into C4D, and render in Octane. I have read about these long triangular polygon probs. and I am sure I am missing the settings somewhere in an import export. Anyone familiar with where in the process I can fix this?

You could dupicate material and set one only for the front selection.
And switch off smothing for this selection in octane material settings.
Should be fine, not the best solution but working.

have you tried to reduce the c4d phong angle between 20/40?
ciao beppe

Try adding a couple of edge loops on the inside of the spider and bevel the edge of the spider. Looks like a shading normals problem, usually fixed by making more geometry around edges.

If there's no curves you could also try to just split the edges.

emer_pl wrote:You could dupicate material and set one only for the front selection.
And switch off smothing for this selection in octane material settings.
Should be fine, not the best solution but working.

I see what you mean smoothing the front section only will get the look corrected for quick solution, thanks for that. I really need to find out how to avoid creating these long triangular polys for the final solution.

bepeg4d wrote:have you tried to reduce the c4d phong angle between 20/40?
ciao beppe

Wasn't sure if you meant in Octane or C4d but dropped the phong angle from 30 to 20 in C4d and re-exported and looks better. I was thinking I would have to start duplicating my designs in C4D and then export to get it right but this will do for now until I can get those long triangular polys worked out. Thanks all for the suggestions I will try these one by one.

in my experience, the first try is to reduce the phong angle in c4d.
if it doesn't work, then it's time to modify the geometry
octane is super sensitive to this value, never thought to ask to the developer if there is something that can be done during the exporting process
ciao beppe