The full C++ source code of SOLID 3.5 including samples and documentation is available from Dtecta's GitHub account. SOLID 3.5 is a software library for collision detection of general 3D shapes. This version of SOLID shipped with the book "Collision Detection in Interactive 3D Environments" and was used to implement the physics in Blender. SOLID 3.5 is offered under a GPL v2/QPL dual license.

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