OpenCSG is a library that does image-based CSG rendering using OpenGL. CSG is short for "constructive solid geometry" and represents a modeling technique for composing shapes with 3D-primitives which are combined using volumetric boolean operations. Image-based CSG rendering means rendering CSG shapes without calculating their surface in object-space. Instead, the image of a CSG shape is composed directly in the frame-buffer of the graphics hardware by rather sophisticated stenciling and z-buffer operations.
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Recent Releases
1.7.018 Jan 2025 16:09
minor feature:
Rendering improvements for the case that the camera is in the interior of the CSG object. With previous releases, this case resulted in rendering errors. Now, this case is, depending on parametrization, handled correctly.
1.6.015 Sep 2023 19:30
cleanup:
On Linux, the implicit dependency on GLX has been removed. So OpenCSG can be used on systems now that come with EGL.
1.5.120 Apr 2022 15:18
cleanup:
Fix for a compilation error introduced with the previous version 1.5.0, that particularly occured with recent gcc versions.
1.5.010 Apr 2022 17:40
cleanup:
With OpenCSG 1.5.0, the license is changed from GPL version 2 only to GPL version 2 or newer. The release also contains small API cleanups.
1.4.229 Sep 2016 06:42
minor bugfix:
Release 1.4.2 fixes a bug if the calling application renders into OpenGL frame buffer objects. In particular, using OpenCSG from a Qt5 QOpenGLWidget is more reliable now.
1.4.111 Sep 2016 09:58
major bugfix:
Release 1.4.1 fixes rendering of CSG expressions with the SCS algorithm on Intel graphics hardware.
1.4.017 Sep 2014 20:42
major bugfix:
The new release 1.4.0 contains bug fixes for rendering CSG expressions made up from more than 255 primitives. OpenCSG implements a couple of different algorithms for rendering CSG, and all of them now work correctly for geometry that exceeds this number of primitives.