I'm trying to render an object in Poser and it keeps giving me strange black patches on the item. I've tried a few different things and nothing seems to help. I have no idea why the item is doing this. It shows up fine in the preview window but then when I render it shows the black patches. It only shows in render.  I've tried different texture map orientations and tried smoothing the item more. I used Wings3d to create the object. Nothing seems to work so far.

Please help!! :(

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have you tried switching on 'Normals Forward' in the texture room?

Try checking the NORMALS FORWARD box in the material settings.

These black polys are usually reversed normals or sometimes a non-planar polygon. Normals forward should fix it if its the normals.

Sometimes it's caused by colinear faces too. And normals forward doesn't always fix them.

Laurie

can you show a wireframe of that model?
is polygon smoothing on?
are you sure you don't have duplicated polygons (your modeler might refer to this as "two-sided polygons")?

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There is sometimes roundoff error bringing in from Wings, try adding displacement node of say 0.001 to fix colinear if normals fixes don't work

Many thanks!  Normals forward worked!  :)

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If you HAVE to hit normals_forward to get your model to render right, then something is wrong with your geometry.  Can I take a look at your OBJ file?  PM me your email address if so.

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Just out of curiosity, you do run the cleanup command in Wings when you finish a model, right? Just to clean up isolated verts and stuff?

Laurie

No. I never run the cleanup command. I wasn't sure what it's function was. I usually select the entire model and tesselate/triangulate, though.

pjz99, I sent you my e-mail address.

I think the problem is that I'm dealing with a very thin piece of material and when I went to give it bends and folds I think I may have gotten some of the geometry messed up.

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All polygons are infinitely thin (they're two dimensional) - I'm pretty sure your problem is that you have two sets of polygons layered up against each other.  We'll see when I get a copy of your model, it won't take long to look.

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model sent....

Thanks. I'm pretty sure that is the problem. I was working with a very thin piece and think I may have gotten some of the front/back orientations messed up while creating folds and stuff.

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