Hi mash,

> Is there any way to preview the way the polygons will
> lay with out having to do an export first?

You have to do an export to see how it's going to mesh, but you can set up a keyboard shortcut that will do an export to a dummy file name and then just cancel instead of actually writing the file.

That's pretty convenient because it avoids having the file dialog come up at all.

To do that go to Options > Shortcut key, and add in a new entry.

On the left-hand "Key" column put in the key that you want to trigger the shortcut. If you do this a lot put in the space bar by typing: Space into that column.

Then on the right-hand "Command" side put in the following:
SaveAs c:\test.obj


Then with that in place when you hit the space bar it will go through the export process but use c:\test.obj as the filename, so it skips the "ask for a filename" step and goes directly into the mesh previewing. Then when you're done looking hit escape or push cancel to bail out, it won't write any file if you cancel at that point.

- Michael

But also you mention being worried about polygon flow - what is it that you are planning on doing with the mesh that you are specifically concerned about that?

If you need a particular kind of polygon flow because you plan on doing sub-d smoothing, you really aren't going to get that kind of a result from MoI's export. MoI's export is more oriented towards making an efficient polygon count with a lightweight wireframe using n-gons. That's a very different kind of mesh structure than a sub-d friendly one which requires a lot more tiling of large areas into numerous quads instead of using something like one big n-gon for a large flat face.

See these previous forum posts for some additional explanation:

http://moi3d.com/forum/index.php?webtag=MOI&msg=3628.132
http://moi3d.com/forum/index.php?webtag=MOI&msg=4096.18
http://moi3d.com/forum/index.php?webtag=MOI&msg=3488.3
http://moi3d.com/forum/index.php?webtag=MOI&msg=3196.11

http://moi3d.com/forum/index.php?webtag=MOI&msg=1536.30

- Michael

I have take some IGS files and convert them polygon models, proably sub-d at that.
I know MOI won't give me a perfect Mesh for that sort of thing. But if I can do anything to reduce my work on the polygon side of the pipeline it helps. Worse case I can do a retopo in 3d coat.

I'm also starting to have to reproduce items, cars etc, that were clearly made in a nurbs package.
But having to build them with sub division modelling is a pain.
Using MOI just to produce a fast low res model can be a big help on the poly modeling side.

Hi mash - yeah basically MoI (with the n-gon option active) builds a mesh that resembles and follows the same topology as the NURBS object - things like one n-gon face for one trimmed planar NURBS surface, etc...

That's a nice clean structure in a lot of ways, like not a lot of extra wires but it's just a generally different kind of structure than what you'll need for sub-d except in particular special cases like with untrimmed surfaces.

But that's great that you've got 3d-coat and can use that for retopo if needed.

I just wanted to clarify that - it's kind of a frequent thing that people see Moi's structured n-gon output and seem to automatically jump to the conclusion that a clean looking wireframe and organized looking topology equates to sub-d friendly topology, when that's not necessarily the case.


If you are looking to produce a rendering of your models, you can just render MoI's output directly - it includes vertex normals with the output which helps things look smooth in the rendering without having to apply any sub-d smoothing on it at all.

- Michael