   CAD Application
  Hi to all,i'm looking for some information about developing a CAD application with opengl.At now, i'm always design and develop 3D software application using opensscenegraph, but i would like to design an application that use a CAD core for the mathematic and Openscenegraph for database and rendering.Is it possible to do that? Are there some web site where i could find information about "how to design and develop a CAD application software"?Thank you in advance.   
  You'll need a solid understanding of tool design in general. Which will include a pretty heavy UI understanding. The trick will be making your program clean enough that it can be expanded indefinitely as it surely will need to.The easy part is then adding all those features but most people resort to hacking before the "easy" is ever acheived. If you make everything script based you might be off to a good start, or at least some kind of plugin/API system. I'd also suggest auto documentation for this area.The other side of the story is you have to know what a good CAD application includes. Do you have a lot of experience with CAD apps? AutoCAD and Solidworks are the two I use. I couldn't live with out Solidworks but at the same time it has some quirks that I can't stand. Are you going to make a better product? Or should I just keep using those?Are you planning on doing 2D, or 3D solids? 3D tube? Mechanical simulation? FEA?Got any cash in your pocket? :P http://www.hoops3d.com/