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Related Experiment Video

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Convergent Polishing: A Simple, Rapid, Full Aperture Polishing Process of High Quality Optical Flats & Spheres

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CST: constructive solid trimming for rendering BReps and CSG.

John Hable¹, Jarek Rossignac

¹Worldwide Visualization Group, Electronic Arts, Vancouver, BC, Canada. jhable@ea.com

IEEE Transactions on Visualization and Computer Graphics

|July 12, 2007

Summary

This study introduces Constructive Solid Trimming (CST) for efficient surface and solid modeling. This new GPU-based rendering algorithm enhances Constructive Solid Geometry (CSG) by improving speed and visual accuracy.

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Area of Science:

Computer Graphics
Geometric Modeling

Background:

Evaluating intersection curves in trimmed B-Rep (Boundary Representation) models is computationally intensive.
Existing methods for Constructive Solid Geometry (CSG) rendering can produce visual artifacts like speckles.

Purpose of the Study:

To introduce Constructive Solid Trimming (CST) as an alternative to explicit intersection curve evaluation.
To develop a novel GPU-based CSG rendering algorithm for improved efficiency and visual fidelity.

Main Methods:

A CST face is defined as the intersection of a surface with a Blist representation of a trimming CSG volume.
The proposed algorithm utilizes a GPU to trim primitive boundaries using a Blist of their active zones.

Main Results:

The CST approach eliminates the need for explicit intersection curve evaluation.
The new GPU-based algorithm is faster than the Blister approach and removes speckle artifacts.
The method enables new capabilities such as surface painting and rendering semitransparent CSG models.

Conclusions:

Constructive Solid Trimming (CST) offers a more efficient and robust method for handling trimmed surfaces in CSG modeling.
The GPU-accelerated rendering algorithm significantly improves CSG model visualization and adds valuable features.