[Merged by Bors] - Faster assign lights to clusters #4345
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superdump
added
A-Rendering
Using the Iterative Sphere Refinement algorithm by Persson et al in Practical Clustered Shading: http://newq.net/dl/pub/s2015_practical.pdf
The normal is normalized and d scale in the Plane constructor
In case the PDF is taken down.
For François. <3
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robtfm
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worth noting that even though the performance impact on assign_lights_to_clusters is quite minimal, this approach also improves the light/cluster culling resulting in typically 5-10% fewer lights per cluster (according to the pdf), so it should also help with rendering perf
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Apr 15, 2022
# Objective - Fixes #4234 - Fixes #4473 - Built on top of #3989 - Improve performance of `assign_lights_to_clusters` ## Solution - Remove the OBB-based cluster light assignment algorithm and calculation of view space AABBs - Implement the 'iterative sphere refinement' algorithm used in Just Cause 3 by Emil Persson as documented in the Siggraph 2015 Practical Clustered Shading talk by Persson, on pages 42-44 http://newq.net/dl/pub/s2015_practical.pdf - Adapt to also support orthographic projections - Add `many_lights -- orthographic` for testing many lights using an orthographic projection ## Results - `assign_lights_to_clusters` in `many_lights` before this PR on an M1 Max over 1500 frames had a median execution time of 1.71ms. With this PR it is 1.51ms, a reduction of 0.2ms or 11.7% for this system. --- ## Changelog - Changed: Improved cluster light assignment performance Co-authored-by: robtfm <[email protected]> Co-authored-by: Carter Anderson <[email protected]>
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Jun 7, 2022
# Objective - Fixes bevyengine#4234 - Fixes bevyengine#4473 - Built on top of bevyengine#3989 - Improve performance of `assign_lights_to_clusters` ## Solution - Remove the OBB-based cluster light assignment algorithm and calculation of view space AABBs - Implement the 'iterative sphere refinement' algorithm used in Just Cause 3 by Emil Persson as documented in the Siggraph 2015 Practical Clustered Shading talk by Persson, on pages 42-44 http://newq.net/dl/pub/s2015_practical.pdf - Adapt to also support orthographic projections - Add `many_lights -- orthographic` for testing many lights using an orthographic projection ## Results - `assign_lights_to_clusters` in `many_lights` before this PR on an M1 Max over 1500 frames had a median execution time of 1.71ms. With this PR it is 1.51ms, a reduction of 0.2ms or 11.7% for this system. --- ## Changelog - Changed: Improved cluster light assignment performance Co-authored-by: robtfm <[email protected]> Co-authored-by: Carter Anderson <[email protected]>
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Feb 1, 2023
# Objective - Fixes bevyengine#4234 - Fixes bevyengine#4473 - Built on top of bevyengine#3989 - Improve performance of `assign_lights_to_clusters` ## Solution - Remove the OBB-based cluster light assignment algorithm and calculation of view space AABBs - Implement the 'iterative sphere refinement' algorithm used in Just Cause 3 by Emil Persson as documented in the Siggraph 2015 Practical Clustered Shading talk by Persson, on pages 42-44 http://newq.net/dl/pub/s2015_practical.pdf - Adapt to also support orthographic projections - Add `many_lights -- orthographic` for testing many lights using an orthographic projection ## Results - `assign_lights_to_clusters` in `many_lights` before this PR on an M1 Max over 1500 frames had a median execution time of 1.71ms. With this PR it is 1.51ms, a reduction of 0.2ms or 11.7% for this system. --- ## Changelog - Changed: Improved cluster light assignment performance Co-authored-by: robtfm <[email protected]> Co-authored-by: Carter Anderson <[email protected]>
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Objective
assign_lights_to_clustersSolution
many_lights -- orthographicfor testing many lights using an orthographic projectionResults
assign_lights_to_clustersinmany_lightsbefore this PR on an M1 Max over 1500 frames had a median execution time of 1.71ms. With this PR it is 1.51ms, a reduction of 0.2ms or 11.7% for this system.Changelog