supported by the National Hi-Tech Research and Development Program of China ("863" Project) (Grant Nos.2009AA12Z227,2009AA12Z215);the National Natural Science Foundation of China (Grant No.40801156)
A real-time algorithm for constructing contour maps from grid DEM data is pre-sented.It runs completely within the programmable 3D visualization pipeline.The interpolation is paralleled by rasterizer units in the grap...