These pages describe a system for constructing boundary representation solid models from a two-dimensional sketch.
Sketch Interpretation System OVERVIEW
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Frontal Geometry (Make Depth Estimates) and Sidedness Reasoning
Identify Region Rotational Symmetry
Create Special Case Topologies
Create General Case Topologies
Identify Constraints on Face Normals
Adjust Face Normals to Match Constraints
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Identification of Junction Angles
Line-Labelling, Edge and Face Counts and Turns at Corners
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If you're not interested in Sketch Interpretation, go to my Home Page