Many Geometry Node instances slow Cycles rendered viewport down (but only in camera view, perspective is fine) #98257

New Issue

Daniel Westlund · 2022-05-19T13:32:03+02:00

Daniel Westlund commented

2022-05-19 13:32:03 +02:00

System Information
windows 10
rtx 2080 ti

broken in Blender 3.1
works in ?

In scenes with many scattered objects, there is a huge difference in performance when in cycles rendered viewport, camera view vs perspective view.
Usually, I think the best way to view such scene, with a lot of scattered objects, is through cycles, with the overlay and gizmos turned off (gpu) as it´s less lag compared to solid view . But, if I switch from perspective to camera view it gets as laggy as if with overlay on/solid shade.

I´m not sure if this is a bug or a limitation but, Sins the perspective view and cam view is visually identical I report this as it would be a lot easier to be able to interactively work in camera view.

Exact steps for others to reproduce the error
Open the attached file and set both perspective view and camera view to rendered se the difference in performance.
note: If you use a Realize Instances node just before outputting the geometry, the lag goes away

Bug_Slow_Camera_VS_Perspective.blend

**System Information** windows 10 rtx 2080 ti broken in Blender 3.1 works in ? In scenes with many scattered objects, there is a huge difference in performance when in cycles rendered viewport, camera view vs perspective view. Usually, I think the best way to view such scene, with a lot of scattered objects, is through cycles, with the overlay and gizmos turned off (gpu) as it´s less lag compared to solid view . But, if I switch from perspective to camera view it gets as laggy as if with overlay on/solid shade. I´m not sure if this is a bug or a limitation but, Sins the perspective view and cam view is visually identical I report this as it would be a lot easier to be able to interactively work in camera view. **Exact steps for others to reproduce the error** Open the attached file and set both perspective view and camera view to rendered se the difference in performance. note: If you use a `Realize Instances` node just before outputting the geometry, the lag goes away [Bug_Slow_Camera_VS_Perspective.blend](https://archive.blender.org/developer/F13090125/Bug_Slow_Camera_VS_Perspective.blend)

Daniel Westlund commented

2022-05-19 13:32:03 +02:00

Added subscriber: @Dawe69

Philipp Oeser commented

2022-05-19 15:49:19 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2022-05-19 15:49:19 +02:00

Looks like this is actually the geometry nodes modifier being calculated.
If you use a Realize Instances node just before outputting the geometry, the lag goes away

Looks like this is actually the geometry nodes modifier being calculated. If you use a `Realize Instances` node just before outputting the geometry, the lag goes away

Philipp Oeser commented

2022-05-19 15:50:38 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Philipp Oeser commented

2022-05-19 15:50:38 +02:00

Will confirm for now (since I cant make sense of it atm).

Philipp Oeser changed title from ~~Slow camera viewport update - cycles~~ to Many Geometry Node instances slow Cycles rendered viewport down (but only in camera view, perspective is fine)

2022-05-19 15:52:16 +02:00

Brecht Van Lommel commented

2022-05-19 16:49:02 +02:00

Closed as duplicate of #92233

Brecht Van Lommel closed this issue

2022-05-19 16:49:02 +02:00

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Many Geometry Node instances slow Cycles rendered viewport down (but only in camera view, perspective is fine) #98257