Hi Marco,
re:
> P.S. Michael, could you please explain more in depth what
> "CentroidTriangulation" is and how it woks ?
It comes into play when you're exporting using "Quads & Triangles" or "Triangles only" modes. The way the mesher works is it starts by making a grid of quads along the "underlying surface" of each face. Then any trim curves on the face will cut any quads they cross into n-gons. If you're exporting n-gons those are directly exported but if you're using "Quads & Triangles" or "Triangles only" modes, the n-gons need to get converted into triangles. If "CentroidTriangulation" in moi.ini is turned on, then it will test if making a center point for the n-gon and making triangles radiating out from that center point is a valid triangulation and if it is use that way. Otherwise without centroid triangulation no center point is added and triangles are formed only between the outer points of the n-gon.
So for example with an n-gon like this:
With centroid triangulation enabled it will add a center point and make a triangulation like this:
Without centroid triangulation, no center point will be added and only the points along the n-gon boundary will get triangulated which will look like this, which has even skinnier triangles than the centroid one:
So in the above case centroid triangulation is probably better.
Where it doesn't work so well is in low poly count situations, especially where the n-gon doesn't happen to have any points vertically aligned with the center like this:
Centroid style:
Non centroid style:
When there's a low poly count the center point which goes on the actual point of the original curved surface tends to be a little distance away from the other points and connecting triangles to it tends to make each n-gon sort of like a little pyramid in shape, which kind of introduces a bad pattern in the poly formation. That's why it's off by default now.
If I remember right I think it was originally added specifically to make meshes that worked better with ZBrush. http://moi3d.com/forum/index.php?webtag=MOI&msg=4978.41
Also see here for a previous example:
http://moi3d.com/forum/index.php?webtag=MOI&msg=3533.14
- Michael |
