Re: Cutting a polygon mesh with a curve?

Date : Thu, 01 Mar 2007 17:44:50 -0500
To : XSI(at)Softimage.COM
From : Joey Ponthieux <j.g.ponthieux(at)LaRC.NASA.GOV>
Subject : Re: Cutting a polygon mesh with a curve?
Brad,
You may already be aware of this, but if your mesh is not too heavy it may be possible to hand draw your edge splits. If you work from your top window from example, and draw your spline through the mesh you want to cut, turn on curve snapping, select the mesh, and split your polys with the Add edge tool, the add edge tool will snap to the curve while adhering to the selected mesh's volume. In other word's it will snap to the curve profile say in the top window, but will draw the new edges in the poly plane of the mesh. With a little effort you can add detail to the mesh using a curve as a guide. Doesn't look to be scriptable because it appears to rely on the current view for the snap positioning, but might be enough to get what you need. What is really neat is that it will snap to edges where the curve intersects with the poly edge as well as snap to the poly plane so you can create new poly shapes within an existing polys plane using the curve as a guide.


Joey Ponthieux
NCI Information Systems Inc.
NASA Langley research Center
____________________________________________________________
Opinions stated here-in are strictly those of the author and
do not represent the opinions of NASA or any other party.



Bradley Gabe wrote:
I attempted the various modify>booleans first, and it tends to slice my
object in undesirable ways. It works for only a subset of projected
curves. I'd also prefer to not have to Frankenstein split meshes back
together repeatedly, since there's a risk of mucking up the integrity of
pre-existing texture maps and such.

I'm not the greatest topology guy, but I might be able to write a custom
tool to do this:

1-Use point locators to find the nearest point on every edge that the
curve projection intersects
2-Create a point at each of these locations
3-Connect the dots

I'm not sure I can get steps 1 and 3 to work. :-)
I just wanted to make sure I wasn't re-inventing the wheel for this.

-Brad


*blinks*

extrude curve then bolean results, same as what trim *kinda* does


On Thu, March 1, 2007 6:40 pm, Bradley Gabe wrote:
Is there a way to cut edges in a polygon mesh using a projected curve or
surface intersection? Some analog to a nurbs trim?




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