RenderingSoft Shadow Textures

Fast soft shadows [Heckbert & Herf 96]



• Render a shadow texture
  • For each shadowed polygon, project all light-source-occluding polygons into the shadowed polygon’s plane
    • Similar to projected planar shadows
    • Model area light sources as multiple jittered points
    • Use additive blending to accumulate all contributions
  • Copy resulting image to the shadow texture
  • Draw polygon in final scene with shadow texture

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