"Persistent Data" stops "Adaptive Subdivision Surface" from working properly. #92893

New Issue

Alaska · 2021-11-07T03:47:46+01:00

Alaska commented

2021-11-07 03:47:46 +01:00

System Information:
Operating system: Linux-5.14.0-4-amd64-x86_64-with-glibc2.32 64 Bits
Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 495.44

Blender Version:
Broken version:
2.93
3.0
3.1.0 Alpha, branch: master, commit date: 2021-11-06 18:29, hash: eddf5ad581
Worked: Not sure

Short description of error
When Persistent Data is enabled and Adaptive Subdivision Surface is used on a surface to allow displacement via the shader editor, then the Adaptive Subdivision Surface will not update to changes in the scene.

Exact steps for others to reproduce the error:
Persistent Data and adaptive sub-division not operating properly.blend

Option 1:

Download the attached file and open it.
Render frame 1.
Render frame 2.

You will notice that the second frame doesn't appear to have much detail. This appears to be because the adaptive subdivision level being used is the same as the first frame, which is optimized for the object being small in the camera view. This is caused by the Persistent Data setting. Disabling the Persistent Data setting and re-rendering the second frame you will notice much more detail as adaptive subdivision surface is now working properly.

Option 2 (Create the file from scratch):

Create a scene in Cycles.
Enabled the Experimental feature set in the Render Properties panel.
Enabled Persistent Data in the Render Properties panel.
Create an object with some initial geometry (a cube subdivided 3 times worked for me) and give it a Subdivision Surface modifier with the Adaptive Subdivision option enabled.
Give the object a material and in the Material Properties panel change the Displacement type to Displacement Only
In the node editor add a Displacement node, connecting the output to the Material Output node.
Add a highly detailed texture and connect it to the Height input of the Displacement node.
Move the camera away from the object and/or change the focal length so the object appears small in the camera view. Keyframe these settings.
On the time line shift to the next frame and move the camera and/or change the focal length so the object is really large in the camera view. Keyframe these settings.
Render the first frame with the zoomed out settings.
Render the second frame with the zoomed in settings.

You will notice that the second frame doesn't appear to have much detail. This appears to be because the adaptive subdivision level being used is the same as the first frame, which is optimized for the object being small in the camera view. This is caused by the Persistent Data setting. Disabling the Persistent Data setting and re-rendering the second frame you will notice much more detail as adaptive subdivision surface is now working properly.

**System Information:** Operating system: Linux-5.14.0-4-amd64-x86_64-with-glibc2.32 64 Bits Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 495.44 **Blender Version:** Broken version: 2.93 3.0 3.1.0 Alpha, branch: master, commit date: 2021-11-06 18:29, hash: `eddf5ad581` Worked: Not sure **Short description of error** When `Persistent Data` is enabled and `Adaptive Subdivision Surface` is used on a surface to allow displacement via the shader editor, then the `Adaptive Subdivision Surface` will not update to changes in the scene. **Exact steps for others to reproduce the error:** [Persistent Data and adaptive sub-division not operating properly.blend](https://archive.blender.org/developer/F11755224/Persistent_Data_and_adaptive_sub-division_not_operating_properly.blend) Option 1: 1. Download the attached file and open it. 2. Render frame 1. 3. Render frame 2. You will notice that the second frame doesn't appear to have much detail. This appears to be because the adaptive subdivision level being used is the same as the first frame, which is optimized for the object being small in the camera view. This is caused by the `Persistent Data` setting. Disabling the `Persistent Data` setting and re-rendering the second frame you will notice much more detail as adaptive subdivision surface is now working properly. Option 2 (Create the file from scratch): 1. Create a scene in Cycles. 2. Enabled the `Experimental` feature set in the `Render Properties` panel. 3. Enabled `Persistent Data` in the `Render Properties` panel. 4. Create an object with some initial geometry (a cube subdivided 3 times worked for me) and give it a `Subdivision Surface` modifier with the `Adaptive Subdivision` option enabled. 5. Give the object a material and in the `Material Properties` panel change the `Displacement` type to `Displacement Only` 6. In the node editor add a `Displacement` node, connecting the output to the `Material Output` node. 7. Add a highly detailed texture and connect it to the `Height` input of the `Displacement` node. 8. Move the camera away from the object and/or change the focal length so the object appears small in the camera view. Keyframe these settings. 9. On the time line shift to the next frame and move the camera and/or change the focal length so the object is really large in the camera view. Keyframe these settings. 10. Render the first frame with the zoomed out settings. 11. Render the second frame with the zoomed in settings. You will notice that the second frame doesn't appear to have much detail. This appears to be because the adaptive subdivision level being used is the same as the first frame, which is optimized for the object being small in the camera view. This is caused by the `Persistent Data` setting. Disabling the `Persistent Data` setting and re-rendering the second frame you will notice much more detail as adaptive subdivision surface is now working properly.

Alaska commented

2021-11-07 03:47:46 +01:00

Added subscriber: @Alaska