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incorrect shading of triangles

Posted: Sun Mar 24, 2013 12:24 pm
by wimver
I found one very old post about this, it seems all unbiased renderers suffer from showing wrong shading of some triangles of low poly objects.
but I have a high poly object here, and as soon as I apply bump mapping (even just 1 percent) I get following result. anyone knows how to deal with this?
smoothing is at 60%, I tried other values, and I hit the recalc button, so it is not that.
tnx
wim

Image

Re: incorrect shading of triangles

Posted: Sun Mar 24, 2013 4:34 pm
by choo-chee
I had a similar issue in maya, I solved it using "unlock normals" and "set to face".

Re: incorrect shading of triangles

Posted: Sun Mar 24, 2013 4:48 pm
by wimver
that is probably a Maya thing, I use plain imported obj files in studio.
but thanks for replying!

wim

Re: incorrect shading of triangles

Posted: Sun Mar 24, 2013 5:31 pm
by Mihai
What does the bump map look like? Because if it's high contrast and high frequency, even 1% might be too much. You could try lowering the nr of repeats and see.

Re: incorrect shading of triangles

Posted: Sun Mar 24, 2013 8:33 pm
by eric nixon
Judging from the picture it looks like the normals are fked up.

Re: incorrect shading of triangles

Posted: Sun Mar 24, 2013 10:05 pm
by polynurb
Maybe a normal map without the 'n' option set in bump?

Re: incorrect shading of triangles

Posted: Mon Mar 25, 2013 12:15 am
by wimver
the bumpmap is a 500x500px noise file, this is a part of it:

Image

the repeat is 3 times in H, 20 times in V direction

Wim

Re: incorrect shading of triangles

Posted: Mon Mar 25, 2013 12:23 am
by wimver
What do you mean by a normal map without the N option set in bump? is this a studio option?

tnx
wim

Re: incorrect shading of triangles [SOLVED]

Posted: Mon Mar 25, 2013 12:33 am
by wimver
OK, lowering the repeat seems to do the trick. I elongated the noise in photoshop, to get the same effect.

thanks all, especially Mihai!

Wim