[vtkusers] CAD advice

[Lior A]

Hello!

My question migh be a bit long, but i'd really apreciate if you read it, because your answer might be very short.

I came across VTK about a month ago while looking for some open source library that can help me perform sophisticated modeling in a reasonable computation time.
As I read vtk text books, I realized that its not intended for modeling as a first goal, and therefore doesn't answer my needs completely. 
I'd like to describe what I'm looking for in an open source library that will satisfy my needs. If you can recommend such libraries, or maybe correct me in thinking that vtk is not the best solution, please write to me.

I'd like to be able to perform actions like:

- creating surfaces and mainly solids from actions such as: revolve, sweep, loft, extrude, etc...

- perform a more complicated variation of a sweep that can use number of guide curves

- perform mathematic calculations such as: surfaces intersections, curve-plane intersection, a curve length calculation, etc.

- perform projection of a curve on a surface

- calculating normals and tangent planes of a surface

- handeling splines, bezier curves, etc...

- stitching surfaces to perform a solid

- handling and distorting a mesh

*** and finally, its a necessary requierment to be able to export a final model to STL (stereo litography) fromat. The intention is to create a model that will eventually be processed and manufacured using machines.

*** I do not have the need for animattion. But visualizing it will be a major advantage.


Not all requirements are obligatory, but they do represent the general idea of what i'm looking for.
Any comment will be apreciated, 
Lior.


      ____________________________________________________________________________________
Never miss a thing.  Make Yahoo your home page. 
http://www.yahoo.com/r/hs