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Point Rendering for Impostors

Point Rendering for Impostors. Andreas Bærentzen IMM. What is so great about points?. PRO: Very simple to render Faster than triangles in some cases Generated by acquisition devices Lead to a natural LOD scheme CON: Present hardware not optimized for points … yet

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Point Rendering for Impostors

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  1. Point Rendering for Impostors Andreas Bærentzen IMM

  2. What is so great about points? • PRO: • Very simple to render • Faster than triangles in some cases • Generated by acquisition devices • Lead to a natural LOD scheme • CON: • Present hardware not optimized for points … yet • Point cloud should be dense [Alexa et al.]

  3. Idea #1: Point Impostors The same set of points are used to represent all LODs Vertex Buffer Objects make it fast(er)

  4. Idea #2: Generate Points using Graphics HW • A Z-buffer makes it possible to extract first visible layer of an object • With two Z-buffers it is possible to render all layers in an object. • The process is called depth peeling [Everitt et al.] • Implementation is possible thanks to shadow mapping extensions.

  5. Depth Peeling [Cass Everitt, NVIDIA]

  6. The little details • Each (non-background) pixel in each layer represents a point. • For each layer, we extract z-buffer and attributes (e.g. color, normal, texture) • We can extract as many attributes as we like. • Repeat from X, Y and Z directions to get even representation • Use normals to decide what points to use from each of X, Y, and Z directions.

  7. DEMO

  8. Conclusions • Points yield very nice continuous LOD impostors • Point sets are easily generated using depth peeling. • Technique is possible now. • Its time is perhaps yet to come.

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