CST: Constructive Solid Trimming for Rendering BReps and CSG

John Hable, Jarek Rossignac
Worldwide Visualization Group, Electronic Arts, Vancouver, BC V6C 3R8, Canada
IEEE Transactions on Visualization and Computer Graphics, 2007


   title={Cst: Constructive solid trimming for rendering breps and csg},

   author={Hable, J. and Rossignac, J.},

   journal={IEEE transactions on visualization and computer graphics},



   publisher={IEEE Computer Society}


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To eliminate the need to evaluate the intersection curves in explicit representations of surface cutouts or of trimmed faces in BReps of CSG solids, we advocate using constructive solid trimming (CST). A CST face is the intersection of a surface with a Blist representation of a trimming CSG volume. We propose a new GPU-based CSG rendering algorithm that trims the boundary of each primitive using a Blist of its active zone. This approach is faster than the previously reported Blister approach, eliminates occasional speckles of wrongly colored pixels, and provides additional capabilities: painting on surfaces, rendering semitransparent CSG models, and highlighting selected features in the BReps of CSG models.
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