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Resolution Independent Curve Rendering using Programmable Graphics Hardware

Charles Loop and James F. Blinn

Abstract

We present a method for resolution independent rendering of paths and bounded regions, defined by quadratic and cubic spline curves, that leverages the parallelism of programmable graphics hardware to achieve high performance. A simple implicit equation for a parametric curve is found in a space that can be thought of as an analog to texture space. The image of a curve’s B´ezier control points are found in this space and assigned to the control points as texture coordinates. When the triangle(s) corresponding to the B´ezier curve control hull are rendered, a pixel shader program evaluates the implicit equation for a pixel’s interpolated texture coordinates to determine an inside/outside test for the curve. We extend our technique to handle anti-aliasing of boundaries. We also construct a vector image from mosaics of triangulated B´ezier control points and show how to deform such images to create resolution independent texture on three dimensional objects.

Details

Publication typeInproceedings
Published inJuly 2005 Transactions on Graphics (TOG) Volume 24 Issue 3 (Siggraph 2005)
PublisherAssociation for Computing Machinery, Inc.
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