This is a simulator of a curtain, and is based on a sample of PhysX.net . You can open and close curtain, control wind and save as DirectX x file.
Get it from Releases.
License is LGPL.
Q: Why is this LGPL?
A: Because this is a modification of a sample of PhysX.net when the license is LGPL. The license of PhysX.net is now MIT but it was not when I wrote this.
PhysX.net : Copyright (c) 2014 stilldesign LGPL