GeoNodes: Getting animated/driven Curve Radius doesn't work if curve has shape key #105806

New Issue

Demeter Dzadik · 2023-03-15T18:52:47+01:00

Demeter Dzadik commented

2023-03-15 18:52:47 +01:00

System Information
Operating system: Linux-6.2.2-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 4.5.0 NVIDIA 525.89.02

Blender Version
Broken: version: 3.6.0 Alpha, branch: HEAD (modified), commit date: 2023-03-15 05:24, hash: 254e3e133fda
Worked: Likely never

Short description of error
This is a pretty specific set-up on the old Curves, so I'm not sure if it's something that needs to be fixed or if this datablock is getting replaced anyways, but I thought it would at least be good to be aware of.

If a curve has a shape key, the GeoNodes "Radius" node seems to fail to return the correct radius value.

I don't know for sure if this is really a GeoNodes issue, though, because from my testing, the way the Radius value works with shape keys just seems pretty weird. It makes a fair amount of sense until the Radius value gets a driver. At that point, the shape key seems to take on whatever value the Radius had when leaving edit mode.

Exact steps for others to reproduce the error

File: radius_driver_not_working.blend
Scale the bone; The curve point's radius is hooked up to be driven by the bone's scale, and the sphere is created by GeoNodes based on that curve point's radius. So, when you scale the bone, the sphere gets bigger.
Add 2 shape keys to the curve
Scale the bone again; Sphere doesn't scale any more.

For my use case, I don't actually need shape keys on my curve, so this won't be an issue for me at all, I just ran into it because I happened to have a temporary shape key on there and I thought I would report it.

**System Information** Operating system: Linux-6.2.2-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 4.5.0 NVIDIA 525.89.02 **Blender Version** Broken: version: 3.6.0 Alpha, branch: HEAD (modified), commit date: 2023-03-15 05:24, hash: `254e3e133fda` Worked: Likely never **Short description of error** This is a pretty specific set-up on the old Curves, so I'm not sure if it's something that needs to be fixed or if this datablock is getting replaced anyways, but I thought it would at least be good to be aware of. If a curve has a shape key, the GeoNodes "Radius" node seems to fail to return the correct radius value. I don't know for sure if this is really a GeoNodes issue, though, because from my testing, the way the Radius value works with shape keys just seems pretty weird. It makes a fair amount of sense until the Radius value gets a driver. At that point, the shape key seems to take on whatever value the Radius had when leaving edit mode. **Exact steps for others to reproduce the error** - File: [radius_driver_not_working.blend](/attachments/7e1b8e22-4625-4337-a4b3-5e1dfca8f014) - Scale the bone; The curve point's radius is hooked up to be driven by the bone's scale, and the sphere is created by GeoNodes based on that curve point's radius. So, when you scale the bone, the sphere gets bigger. - Add 2 shape keys to the curve - Scale the bone again; Sphere doesn't scale any more. For my use case, I don't actually need shape keys on my curve, so this won't be an issue for me at all, I just ran into it because I happened to have a temporary shape key on there and I thought I would report it.

radius_driver_not_working.blend

300 KiB

Demeter Dzadik added the

labels 2023-03-15 18:52:47 +01:00

Iliya Katushenock commented

2023-03-15 20:08:39 +01:00

Hello. Simplify the file. It's better to start from scratch. Whatever there are unrelated scripts that ask to run when the project is opened.
If you create an object that copies the curve and converts it to a mesh using a profile, you can see that there is a radius. The presence of shape keys does not affect this. But the bone binding stops working. It seems to be just some kind of limitation not related to geometry nodes, Need check in older versions...

Hello. Simplify the file. It's better to start from scratch. Whatever there are unrelated scripts that ask to run when the project is opened. If you create an object that copies the curve and converts it to a mesh using a profile, you can see that there is a radius. The presence of shape keys does not affect this. But the bone binding stops working. It seems to be just some kind of limitation not related to geometry nodes, Need check in older versions...

Iliya Katushenock commented

2023-03-15 20:14:13 +01:00

Yes, this is not a regression, it was like that before (2.9). It doesn't look like a bug yet.

Iliya Katushenock added the

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GeoNodes: Getting animated/driven Curve Radius doesn't work if curve has shape key #105806