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Snap-dragging in three dimensions
I3D '90 Proceedings of the 1990 symposium on Interactive 3D graphics
Proceedings of the 27th annual conference on Computer graphics and interactive techniques
OpenGL Programming Guide: The Official Guide to Learning OpenGL, Version 1. 4
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We present a simple yet effective snapping technique for constraining the motion of the cursor of an input device to the surface of 3D models whose geometry is arbitrarily deformed by a programmable hardware fragment and vertex processor. The technique works in image space and thus snaps the cursor to the geometry actually rendered instead of the geometry originally submitted to the rendering pipeline. We also present a method to establish a correspondence between snapped geometry in image space and object space, and an efficiency improvement based on the control of frequency of frame buffer accesses. Performance tests are conducted and compared against the standard picking and snapping algorithm used by the D3DX library of the Microsoft Direct3D API. We conclude by emphasizing the feasibility of our algorithm when facing the new advances of the graphics hardware for deforming geometry on the GPU.