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CSC418 Computer Graphics

CSC418 Computer Graphics Polygon Clipping Polygon Clipping Clipping is a procedure for spatially partitioning geometric primitives, according to their containment within some region. Why do we clip? Distingish whether geometric primitivies are inside or outside of a viewing region

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CSC418 Computer Graphics

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  1. CSC418 Computer Graphics • Polygon Clipping

  2. Polygon Clipping • Clipping is a procedure for spatially partitioning geometric primitives, according to their containment within some region. • Why do we clip? • Distingish whether geometric primitivies are inside or outside of a viewing region • Distinguish whether geometric primitivies are inside or outside of a picking region • Detecting intersections between primitives • Binning geometric primitives into spatial data structures. • Shadows.

  3. Sutherland-Hodgman clipping • Given: Polygon (list of vertices), clipping window (convex) for each clip edge for each vtx and next in polygon { clip against edge }

  4. Sutherland-Hodgman clipping

  5. Sutherland-Hodgman clipping

  6. Sutherland-Hodgman clipping • Culling before clipping

  7. CSC418 Computer Graphics Next Lecture…. • Introduction to geometric transformations

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