Attached Link: Wings 3d

If you had a modeling program (say Wings 3d) you could post a mesh, and some of the problems might reveal themselves. To be honest, there's a modeling forum here, and that's where the experts hang out.

The building has polygons with more than four sides at the arches and where the windows are placed. This is just a shell of the actual structure. I wanted to test things in Poser. I built in Modo, but I thought this might be a Poser-related issue with a known workaround, so I posted here.

Attached Link: http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=1895179

basically OBJ does not like holes... and you've modeled Holes my friend. read the link and take a look at your model. (the images have been resized - click 'em to be able to read them)

Pakled - Poser doesn't mind triangles at all.  There are thousands of models made up of tris.

Thanks, Khai. Now I can fix things.

Paloth,
Sometimes all you need to do is just split the verts (uv mapper) and all will settle down and look as it should.

Quote - Paloth,
Sometimes all you need to do is just split the verts (uv mapper) and all will settle down and look as it should.

won't work on this one, mores the pity... if you see on each face with an arch or window, there's no edges connecting the vertices... so, when Poser (and a quite a few other programs) try to use it, they 'web' over the hole closing it. the only way to really sort the problem out is to add edges so the program can handle the hole properly.

That looks like a triangulation problem to me, caused by your n-gons. The n-gons are being converted to mesh (triangles) and it is bridging across the arches, where you n-gons are, to do the conversion.
Quadrangulate the model.
Holes in faces are no problem for .obj, unless the surrounding topolgy of the faces co-planar to the hole are not correct. Unless that is a Poser specific thing.

Quote - That looks like a triangulation problem to me, caused by your n-gons. The n-gons are being converted to mesh (triangles) and it is bridging across the arches, where you n-gons are, to do the conversion.
Quadrangulate the model.
Holes in faces are no problem for .obj, unless the surrounding topolgy of the faces co-planar to the hole are not correct. Unless that is a Poser specific thing.

nope sorry... OBJ does not like holes. the format was not written with them in mind - they have to be edged to avoid the bridging (webbing).

I can prove this in : Poser, Daz Studio, trueSpace, UVmapper.....

wireframe please, since what you are saying is actually against observed facts.

What is a wireframe going to prove?
It's a one-sided plane with a hole in it. Four quads (lines connecting the corners, like a picture frame).

EDIT- I just checked. It worked fine in Poser 5 too.

and theres how it works.

*Four quads (lines connecting the corners, like a picture frame)

*take the Quads out (remove the lines connecting the corners) and just have a square with hole and it won't work and will bridge / web. you are misunderstanding the problem. please read my link above and you will see what we are talking about.

That is because if there are no connecting lines, then you have an n-gon w/ angles greater than 180 degrees.
'sides' of a polygon refers to how many vertices the polygon has.

Quote - That is because if there are no connecting lines, then you have an n-gon w/ angles greater than 180 degrees.
'

and that is what the problem with his mesh is. take a look at his picture and you will see.

Quote - What is a wireframe going to prove?
It's a one-sided plane with a hole in it. Four quads (lines connecting the corners, like a picture frame).

EDIT- I just checked. It worked fine in Poser 5 too.

You, Sir, do not have a hole IN the face, you have your hole BETWEEN THE FACES. And This, Sir, is  something completely different to what you're pretending to talk about.

@Paloth
Just quadrangulate (or triangulate) your model. It is the n-gons that are causing the problem for you. Holes are fine, as long as they are surrounded by quads (or triangles) with angles less than 180 degrees.

@Khai
I have no idea what the garbage topology of the bottom wireframe is supposed to demonstrate. The top one has correct topology, and will work fine. The bottom just would need to connect the vertices to work...
I don't know what else to say about the subject; but don't want to argue with anyone. That is not why I come here.

ain't arguing anymore. you have no idea what we're talking about and I'm not going to argue with you.

hang on

I just reread your post.

*@Paloth
Just quadrangulate (or triangulate) your model. It is the n-gons that are causing the problem for you. Holes are fine, as long as they are surrounded by quads (or triangles) with angles less than 180 degrees.

THAT IS EXACTLY THE ADVICE I GAVE HIM BEFORE YOU ENTERED THE THREAD AND STARTED ARGUING ABOUT PETTY DETAILS!!!!!!!
thank you for annoying the hell out of me for no reason. please just go before I break the TOS.

in case nobody mentioned, poser prefers quadrangles, but uses plenty of triangles as polygon faces. in the old days it didn't like polygons with more than 4 sides, but that may have changed in P7.

M1 and V1 both have N-gons hidden in their topology, but that was fixed with M3/V3/etc.

And if you don't export as quads/tris, you have an extremely good chance of getting issues.

There is a version difference in handling holes, even when the
mesh is nicely built with 4-sided polys everywhere.  P4 and 5
render a hole in a one-sided mesh properly, but 6 tries to 'web over'
the hole.

I think 7 had the same problem initially, but it seems to have been fixed 
in the latest SR.

I noticed this when building terrains with excavations for cellars...
in 6 (and maybe the first 7) I had to make the terrain as a two-sided
box with inward-facing facets around the hole.
(Topologically, a squared-off torus.)

All versions will reject a not-so-nice mesh with convex or overlapping
faces, or badly-formed holes.

Quote - hang on

I just reread your post...*
*THAT IS EXACTLY THE ADVICE I GAVE HIM BEFORE YOU ENTERED THE THREAD AND STARTED ARGUING ABOUT PETTY DETAILS!!!!!!!
thank you for annoying the hell out of me for no reason. please just go before I break the TOS.

I wasn't trying to be annoying or argumentive, sorry about that.

As others pointed out Poser and Daz Studio dont interpret n-gons in the same way other modelling programs do. Turn off the check box for smoothing , and in your modelling program split your mesh into quads and triangles , especially where there are holes .

Poser also seems to hate long thin triangles , so you may have to manually split polys .

If you can see the underlying mesh on a surface (shown by lines on the texture) you may want to unweld those polys . Its that automatic smoothing again that is messing up .

Good luck with it .

now you see why I don't post in the Modeling forum...;) I'm still on Poser 5...I guess P6 and 7 are different..;)
Welp, never too old to learn something new. thanks. 

*Its that automatic smoothing again that is messing up .

actually smoothing does nothing to affect this situation... you can recreate the same 'webbing' over holes in any program. Eg you can create it easily in Uvmapper which does not use smoothing. 

Quote - THAT IS EXACTLY THE ADVICE I GAVE HIM BEFORE YOU ENTERED THE THREAD AND STARTED ARGUING ABOUT PETTY DETAILS!!!!!!!
thank you for annoying the hell out of me for no reason. please just go before I break the TOS.

Khai,
Why do you have to take such a condensending and agressive stance for?
Can't you accept a different opinion as just that, a different opinion; instead of taking it as a insult against your intelligence???

Your anger is very unbecoming.

Paloth, Sometimes all you need to do is just split the verts (uv mapper) and all will settle down and look as it should. Darkedge, you saved my sanity. I had connected the points at the edge of a round window hole, but no matter how close I brought the connection, the stretch lines distorted the geometry in Poser at every crease level setting. When I cut the wall loose from the inner window and imported the model into Poser, the stretch lines had disappeared. It was perfect. I think this obj. issue will be less nettlesome next time when I know what to expect.

Good Paloth, happy that helped you.
Learning what Poser does to obj's is a learning experience. After a while you can pretty much stay away from problems but there will always be a new one lurking in the background I'm afraid.

I just wanted to mention that UVMapper Pro will do two types of triangulation and will also sub divide meshes as well.