Csc418 computer graphics
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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 l.jpg
CSC418 Computer Graphics

  • Polygon Clipping


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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.


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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

    }




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Sutherland-Hodgman clipping

  • Culling before clipping


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CSC418 Computer Graphics

Next Lecture….

  • Introduction to geometric transformations