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Subject: What creates these artifacts?

Kagato98 opened this issue on Sep 30, 2002 · 17 posts
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Kagato98 ( ) posted Mon, 30 September 2002 at 4:33 PM · edited Sat, 11 January 2025 at 6:39 AM

file_25570.jpg

I've ran into these artifacts more than a few times, and I've never understood what makes them. What are they called, what makes them, and how can I avoid them?

peejay ( ) posted Mon, 30 September 2002 at 5:08 PM

It's either a flipped polygon, or a missing polygon. over to the experts please?

Kagato98 ( ) posted Mon, 30 September 2002 at 5:17 PM

Nothing pisses me off more than a flipped polygon.

lgrant ( ) posted Mon, 30 September 2002 at 5:28 PM

Don't know how to avoid them...seems to happen a lot when you convert things from other modeling packages. You can fix them in UV Mapper Pro by selecting the polygon and using the invert facets function. Lynn Grant Castle Development Group

hankim ( ) posted Mon, 30 September 2002 at 6:25 PM

If the polygon is actually there and not missing, you can also fix it right in Poser using the grouping tool.

Kagato98 ( ) posted Mon, 30 September 2002 at 7:01 PM

hankim: Would you mind describing the procedure used to remove these artifacts using Poser's grouping tool :) ?

Mason ( ) posted Mon, 30 September 2002 at 7:08 PM

Its also caused by layered polygons that are close to each other. Also bad UVs can cause that. Does it happen in preview mode or just render mode?

Kagato98 ( ) posted Mon, 30 September 2002 at 7:33 PM

Mason: Both preview and render mode.

hankim ( ) posted Mon, 30 September 2002 at 10:35 PM

file_25571.jpg

I will try and describe it, as best I can :-) Notice the flipped polygons on the right (not the rest of the crappy modeling)

hankim ( ) posted Mon, 30 September 2002 at 10:40 PM

file_25572.jpg

Open the grouping tool, and if neccessary select the correct group containing the flipped polys. Rotate around/zoom until you can see the polygons that are facing the wrong direction.

hankim ( ) posted Mon, 30 September 2002 at 10:42 PM

file_25573.jpg

In the grouping tool window, create a new group. Using the mouse, click on the backwards polys to select them, and then hit the "reverse group normals" button.

hankim ( ) posted Mon, 30 September 2002 at 10:48 PM

file_25574.jpg

Close the grouping tool window, and you should be all done. Keep in mind that this is the down and dirty way, so to speak, and won't be useful in all situations, but it could come in handy some day. Hope this helps, someday and somehow :-)

Kagato98 ( ) posted Tue, 01 October 2002 at 5:28 AM

This really sucks. There's no way I can get to the other side of that polygon. I've tried for about half an hour now ;( . Somebody should make a 3rd party program to fix this stuff.

hankim ( ) posted Tue, 01 October 2002 at 6:39 AM

the Pro version of UV Mapper can do it... if you are trying the grouping tool method, you might try switching document display styles, if you haven't already; you MIGHT find one that will let you get to the flipped polygon. Alternatively, if it is a free thing and not part of something you bought, you can send it to me or tell me where you got it, and I will try and have a go at it, as well. Sorry you are having so much trouble with it...

EnglishBob ( ) posted Tue, 01 October 2002 at 7:33 AM

It could also be degenerate facets - UVmapper will fix these (any version). Select all and press I think it is...

bloodsong ( ) posted Tue, 01 October 2002 at 5:09 PM

heyas; okay, a black thing like that is NOT an inverted normal. that's a degenerate facet. the inverted normal will look more like a hole, like in the belt, there. in uv-mapper, the 'fix degenerate facets' button is insert. save your model to a new name after that, in case you don't like the fix. it's rather unclear why degenerate facets occur. i know they can appear on thin or pointy things because poser truncates the vertex coordinates... but when it happens on larger, flat areas.... i've no idea.

EnglishBob ( ) posted Wed, 02 October 2002 at 3:56 AM

I could have sworn I typed "insert" up there. Premature senile dementia I guess. :-( Thanks Bloodsong...

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