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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

@article{hable2007cst,

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

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

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

   pages={1004–1014},

   year={2007},

   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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