Okay when I render my model I get this weird looking render but looks good in preview. Checked the mapping and it is correct. Can anyone tel me how to fix?

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Here is what it looks like in preview

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what did you model it in ?  some of that could b non-planar polygons or flipped normals .

Max 7

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Poser does not like n-sided polygons (n>=5). I always use UVMapper Pro to triangulate anything that's not a tri or a quad.
UVMapper Pro can cneck for degenerate and non-planar facets and fix the problem by triangulating them. I'm not sure whether the free version of UVMapper can do this too.

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Quote - Poser does not like n-sided polygons (n>=5). I always use UVMapper Pro to triangulate anything that's not a tri or a quad.
UVMapper Pro can cneck for degenerate and non-planar facets and fix the problem by triangulating them. I'm not sure whether the free version of UVMapper can do this too.

I have UVMapper Pro but could not figure out how to check for non planar facets or degenerate ones.

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It's in Tools->Facets, if you chose "Concave" itl'll scan for concave facets and triangulate them as needed. Same for Tools->Facets->Degenerate.

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Doing as suggested made it worse

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Weld or Split vertices in UV Mapper Pro maybe?

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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If welding or splitting the vertices doesn`t work then it looks like some of the polygons are reversed.

I know none are reversed due to converted it to double sided at one point to see if that fixed it. Here is a render of it in D|S it is not as noticeable there.

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Wish to thank Khai for helping me fix this. Easy fix is to go into the Material room, select texture and click on Normals Forward. Here is a preview. I am working on some textures and remapping.

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So it was reversed normals, as I said.

Quote - So it was reversed normals, as I said.

no, it's a double faced surface with a zero thickness.. and has been known about since Poser 5...
the fix in 5 was add a small amount of displacement, 6 and higher have the Normals switch.. Most render engines can allow for it.

and I'm suprised at the names in this thread that did'nt spot it.... as I said.. it's been known for years...

That must have been the same problem I had with the 3dsc fairytale coach (but I don`t know how it got double faced surfaces).

Hey Khai, I'm callin' you out!  (just joking) :D

I have rarely (if ever) encountered this in Poser so it didn't register but it is mentioned in B L Render's book.  Really, without the obj file to examine it could have been ngons, normals, degenerate polygons, double-sided polygons, need for welds/splits (which is a common problem resulting in odd shading results), and so on.

Hopefully that solves it! :)

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

Contact Me | Kuroyume's DevelopmentZone

nyguy:

i'm surprised that  svdl didn't mention that he has a script that changes all the normals forward in a scene at once.

http://www.renderosity.com/mod/forumpro/showthread.php?message_id=3171555&ebot_calc_page#message_3171555

Well I had just uploaded it to my website and it is live for downloading. I will be working on textures later right now I gotta play with my son for a few.
To download click on my banner and click freebies.

Poserverse The New Home for NYGUY's Freebies

Great, thank you.