Cycles adaptive subdivision tasks #53901

New Issue

Brecht Van Lommel · 2018-01-25T07:11:53+01:00

Brecht Van Lommel commented

2018-01-25 07:11:53 +01:00

Adaptive subdivision and displacement needs some work still to be considered stable and fully supported. This task is to keep track of what needs to be done.

Subdivision:

#49159: Normal maps do not work, no tangents are computed.
#49585, also #86684: Adaptive subdivision setting linking issue (Make adaptive subdivision a proper modifier setting so it is copied correctly)
#49431: Missing smooth (face-varying) UV subdivision.
#73395: Pointiness not working with subdivision
#73403: Missing vertex colors
Motion blur not working (test file , report #83639)
Support for instances, two strategies both worth trying:
Object space dicing option so users can manually set it for all instances Bin instances according to distance from camera, so we have about log(N)
Grid primitive to reduce memory usage
Optimizations, reduce memory allocations, .. (#73564 (Adaptive subdivision modifier takes to much memory ))
In Blender 2.8, Blender subdivides the mesh itself which leads to too much memory usage.
#78055: panorama dicing works poorly compared to matching perspective camera
#92893 ("Persistent Data" stops "Adaptive Subdivision Surface" from working properly.)
#97364 (Adaptive subdivision breaks attributes passed from geometry nodes to shader editor)

Displacement:

Fast BVH refit updates when tweaking displacement shader
Better results for bump from vector displacement.
Vector displacement tangents compatible with other software.

Adaptive subdivision and displacement needs some work still to be considered stable and fully supported. This task is to keep track of what needs to be done. Subdivision: * #49159: Normal maps do not work, no tangents are computed. * #49585, also #86684: Adaptive subdivision setting linking issue (Make adaptive subdivision a proper modifier setting so it is copied correctly) * #49431: Missing smooth (face-varying) UV subdivision. * #73395: Pointiness not working with subdivision * #73403: Missing vertex colors * Motion blur not working ([test file ](https://drive.google.com/open?id=12qOQg-5YSj4rTwwwFU3VFQJBE7-pPRNp), report #83639) * Support for instances, two strategies both worth trying: **Object space dicing option so users can manually set it for all instances** Bin instances according to distance from camera, so we have about log(N) * Grid primitive to reduce memory usage * Optimizations, reduce memory allocations, .. (#73564 (Adaptive subdivision modifier takes to much memory )) * In Blender 2.8, Blender subdivides the mesh itself which leads to too much memory usage. * #78055: panorama dicing works poorly compared to matching perspective camera * #92893 ("Persistent Data" stops "Adaptive Subdivision Surface" from working properly.) * #97364 (Adaptive subdivision breaks attributes passed from geometry nodes to shader editor) Displacement: * Fast BVH refit updates when tweaking displacement shader * Better results for bump from vector displacement. * Vector displacement tangents compatible with other software.

Brecht Van Lommel commented

2018-01-25 07:11:53 +01:00

Added subscribers: @brecht, @MaiLavelle

blender-admin commented

2018-01-25 07:11:53 +01:00

#102451 was marked as duplicate of this issue

blender-admin commented

2018-01-25 07:11:53 +01:00

#85030 was marked as duplicate of this issue

blender-admin commented

2018-01-25 07:11:53 +01:00

#68914 was marked as duplicate of this issue

Brecht Van Lommel changed title from ~~Cycles microdisplacement task~~ to Cycles microdisplacement tasks

2018-01-25 07:12:55 +01:00

Brecht Van Lommel commented

2018-01-25 09:09:56 +01:00

Discussed the remaining tasks with @MaiLavelle, here's the IRC log for reference.
microdisp_irc_log.txt

I'll get the displacement part in a state where it can be made a non-experimental feature. We're pretty close to that, we mainly need to finish D3018 and D3019, and verify that things like Both displacement and tangents are working ok. Vector displacement can be added afterwards, it likely requires some deeper changes to tangents to be compatible with other software.

The subdivision part still requires more work to become a fully supported feature. @MaiLavelle is working on smooth UV subdivision. Instances and cracks / discontinuities are the other two main issues.

Discussed the remaining tasks with @MaiLavelle, here's the IRC log for reference. [microdisp_irc_log.txt](https://archive.blender.org/developer/F1976409/microdisp_irc_log.txt) I'll get the displacement part in a state where it can be made a non-experimental feature. We're pretty close to that, we mainly need to finish [D3018](https://archive.blender.org/developer/D3018) and [D3019](https://archive.blender.org/developer/D3019), and verify that things like Both displacement and tangents are working ok. Vector displacement can be added afterwards, it likely requires some deeper changes to tangents to be compatible with other software. The subdivision part still requires more work to become a fully supported feature. @MaiLavelle is working on smooth UV subdivision. Instances and cracks / discontinuities are the other two main issues.

Ronny G commented

2018-01-26 12:45:49 +01:00

Added subscriber: @nudelZ