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!! :(

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")?

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!  :)

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.

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.

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.

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.