Created attachment 175186 [details]
From the ChangeLog:
11-Sep-2016: OpenCSG 1.4.1 released
On Intel graphics hardware, the new rendering path in the SCS algorithm in OpenCSG 1.4.0 entirely failed to work. This was apparently due to an incompatibility of the fragment program with the fixed function pipeline used at the vertex stage. OpenCSG 1.4.1 implements a workaround: a vertex program is now used instead. I hope that the rendering bugs on Intel graphics hardware are now really a thing of the past.
15-Sep-2014: OpenCSG 1.4.0 released
OpenCSG 1.4.0 contains a bug fix for rendering CSG expressions with more than 255 primitives. For the layered Goldfeather algorithm, this number of primitives could cause an endless loop before. In the case of the SCS algorithm, there were rendering errors with older versions.
For the SCS algorithm, the fix contains a new rendering path: using a fragment program, a kind of alpha test is performed based on all the components (r, g, b, a) of a fragment. This allows, in theory, to distinguish 2^32 - 1 primitives instead of 2^8 - 1 before. This new rendering path should be, in theory, also more stable than the old one, and some rendering problems reported for Intel graphics hardware might be solved with the new version.
11-May-2014: OpenCSG 1.3.3 released
OpenCSG 1.3.3 is a maintenance release, providing minor portability improvements and bug fixes. In particular, OpenCSG should now compile out-of-the-box on Linux x64 systems.
While here also pet portlint and add a license: It's GPLv2.
BTW, there is an exception clause for cgal (which I didn't account for).
Created attachment 178263 [details]
Upgrade to version 1.4.2
New minor version
A commit references this bug:
Date: Sun Jan 21 16:13:07 UTC 2018
New revision: 459616
Update to 1.4.2
Thanks for providing a patch.