20161114 - Believing in an Image
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+Distraction Free Rendering +
+The stills below are from the filtering talk I gave a while back. +Showing a journey through some folded fractal space. +They are captures from a real-time tracer running at over 120 Hz at 1080p on a 2.8 Tflop/s laptop GPU. +
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+The images have better than 1080p resolution phase response, +meaning you can localize the position of an edge to a sub-pixel position. +However the images have lower than 1080p frequency response, +meaning the images look substantially sharper when viewed at half resolution. +This is a direct result of the following process, +
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- Each frame traces 960x540 rays in a temporally changing low-discrepancy pattern. +
- The rays also sample their prior color as reprojected from the prior 1920x1080 frame. +
- Finaly the {new,old} output at low-descrepency 960x540, is reconstructed at regular grid 1920x1080. +
+As you move through the space in real-time, +the output feels like a window into another world. +There is nothing in the visual output which breaks immersion. +It makes no difference that in terms of sharpness this could only qualify as a 480x270 image +if the evaluation metric was to match the visual sharpness of bitmap text. +
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+The critical element is a total lack of any kind of temporal aliasing, +mixed with sub-pixel precision for localizing all edge gradients. +
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