Geometry Nodes: Sample UV Surface node is slow when UV Map is large #103779
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Reference: blender/blender#103779
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System Information
Operating system: Linux-6.1.3-gentoo-x86_64-Intel-R-_Core-TM-i9-9900K_CPU@_3.60GHz-with-glibc2.36 64 Bits
Graphics card: NVIDIA GeForce RTX 2080/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 525.60.13
Blender Version
Broken: version: 3.5.0 Alpha, branch: HEAD (modified), commit date: 2023-01-09 18:05, hash:
b314d92e7dShort description of error
While exploring the possibility of scaling a UVMap up far beyond the usual 0-1 scale in a pursuit of making better use of the space for more precision, I noticed that the Sample UV Surface node suddenly takes 3 seconds to evaluate, just because I scaled up the UVMap by 100x.
Perhaps this is working as intended / is an inherent, mathematical limitation, I'm not sure.
Exact steps for others to reproduce the error
phil_test_regular_uv_scale.blend
phil_test.blend
The evaluation time reported for the sample node goes from 0.47ms to 3150ms.
Added subscriber: @Mets
Added subscriber: @mod_moder
Floating precision means you don't care about scale for precision.
Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'
I can confirm the direct dependence of the speed of work on the size of the space
GeoNodes: Sample UV Surface node is slow when UV Map is largeto Geometry Nodes: Sample UV Surface node is slow when UV Map is largeAdded subscriber: @JacquesLucke
Added subscriber: @CharlieJolly
Confirmed issue. Now the node algorithm has not the best design and gives complexity:
Total loop trinagles*loop trinagle sizes^2D axis+Total loop trinagles*Map lookup function*Algorithm for rechecking sampling by found elementsI have opened an task to merge all reports related to this issue #106713. This is currently a limitation of the implementation, so I'll close this as a known limitation. You can subscribe to #106713 manually to receive notifications.