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Distributed Ray Tracing

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  1. Distributed Ray Tracing Robert L. Cook Thomas Porter Loren Carpenter

  2. What is Distributed Ray Tracing? • Distributed Ray Tracing uses randomly distributed oversampling to remove the aliasing effect in the rendered image.

  3. Distributed Ray Tracing Topics • Gloss (Blurred Reflections) • Translucency (Blurred Transparency) • Penumbras (Soft Shadows) • Depth of Field • Motion Blur

  4. Gloss (Blurred Reflections) • Standard ray tracing produces sharp reflections (mirror like). • Distributed ray tracing uses multiple rays around the reflected ray to produce a blur image of the reflected object.

  5. Sharp VS Fuzzy Gloss Standard Ray Tracer Distributed Ray Tracer ( 50 Rays )

  6. Another Gloss Example

  7. Translucency (Blurred Transparency) • Standard ray tracing are good at producing perfectly transparent surface. • Distributed ray tracing uses multiple rays around the refracted ray to cause a blurring effect.

  8. Sharp VS Fuzzy Transparency Standard Ray Tracer Distributed Ray Tracer ( 20Rays )

  9. Another Transparent Example

  10. Penumbras (Soft Shadows) • Occurs when the light source is partially obscured. • With normal ray tracing a point is either obscured or not, which cause Hard Shadows. • Distributed ray tracing uses many rays to see how much of the light source is obscured.

  11. Hard VS Soft Shadows Standard Ray Tracer Distributed Ray Tracer ( 50 Rays )

  12. Another Soft Shadow Example

  13. Depth of Field • Regular ray tracing uses the pinhole camera model which produces perfectly in focus images. • Distributed ray tracing places a lens in front of the view plane which causes objects far from the focal plane to blur.

  14. Depth of Field Example

  15. Motion Blur • Occurs when an object is moving relative to the camera. • Distributed ray tracing takes multiple ray samples through a certain number of frames to calculate the blur effect.

  16. Motion Blur Example

  17. All Techniques Combined

  18. Conclusions • All of the methods covered under distributed ray tracing are all interrelated. • Without the ability to antialias point sampling Distributed ray tracing would not have been possible.

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