OPENCSG

OpenCSG is copyrighted by Florian Kirsch and by the Hasso-Plattner-Institute at the University of Potsdam (HPI), Germany... Before OpenCSG, CSG rendering has been hardly used in interactive applications, since the necessary algorithms are complicated and error-prone. By providing a free library that is easy to use, fast, and portable, OpenCSG has helped making CSG rendering more mainstream than it was in the past... OpenCSG creates, and reuses between different calls, various OpenGL resources such as PBuffers or frame buffer objects. This may be a problem in MDI applications with several OpenGL windows, of which the OpenGL contexts are not shared. In this case, OpenGL resources allocated in one OpenGL context cannot be reused with another context, so OpenCSG would produce rendering errors. To solve this, the OpenCSG context can be set to some unique integer identifier of the OpenGL window. OpenCSG then creates/uses OpenGL resources in the function per context. The function frees..