Hard Limit of 8 Instancer attributes for EeVe/ EeVe next - unclear if a bug or intentional #117928

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bassam kurdali · 2024-02-07T00:40:57+01:00

bassam kurdali commented

2024-02-07 00:40:57 +01:00

System Information
Operating system: Fedora Linux 39/Gnome
Graphics card: Intel OR Nvidia (13th Gen Intel® Core™ i9-13900H or Mobile RTX 2000 ADA)

Blender Version
Broken: 4.0, 4.1
Worked: Never?

Short description of error
I'm writing some instance attributes to control a shader from Geometry nodes within a geometry nodes modifier, in the theory that I don't need to write the same data to every vertex if it is the same, better to just write it to an instance.
Using the attributes in Cycles works fine
Using the attributes in EeVee or EeVee next stops working at the 9th attribute used, breaking shaders.

Exact steps for others to reproduce the error

Load the file testEV.blend
Switch to rendered view in the 3D Viewport
Play with the factor slider in the red mix node; observe the colors it goes between
Switch to EeVee or EeVee next
Play with the same slider: note the different results screenshoted, the last attribute "BASE_8" is not being read

Workaround for scalar attributes
The number 8 is a hard limit for any attribute type, if you need only scalars you can bundle each 3 into one vector attributes, increasing the limit (potentially) to 24

**System Information** Operating system: Fedora Linux 39/Gnome Graphics card: Intel OR Nvidia (13th Gen Intel® Core™ i9-13900H or Mobile RTX 2000 ADA) **Blender Version** Broken: 4.0, 4.1 Worked: Never? **Short description of error** I'm writing some instance attributes to control a shader from Geometry nodes within a geometry nodes modifier, in the theory that I don't need to write the same data to every vertex if it is the same, better to just write it to an instance. Using the attributes in Cycles works fine Using the attributes in EeVee or EeVee next stops working at the 9th attribute used, breaking shaders. **Exact steps for others to reproduce the error** - Load the file testEV.blend - Switch to rendered view in the 3D Viewport - Play with the factor slider in the red mix node; observe the colors it goes between - Switch to EeVee or EeVee next - Play with the same slider: note the different results screenshoted, the last attribute "BASE_8" is not being read **Workaround for scalar attributes** The number 8 is a hard limit for any attribute type, if you need only scalars you can bundle each 3 into one vector attributes, increasing the limit (potentially) to 24

testEV.blend

1.0 MiB

Screenshot from 2024-02-06 18-38-46.png

510 KiB

Screenshot from 2024-02-06 18-38-56.png

472 KiB

bassam kurdali added the

labels 2024-02-07 00:40:57 +01:00

bassam kurdali added reference blender-v4.0-release

2024-02-07 00:41:14 +01:00

bassam kurdali changed reference from ~~blender-v4.0-release~~ to main

2024-02-07 00:41:30 +01:00

bassam kurdali changed reference from ~~main~~ to blender-v4.0-release

2024-02-07 00:41:37 +01:00

bassam kurdali added this to the EEVEE & Viewport project 2024-02-07 00:41:51 +01:00

bassam kurdali commented

2024-02-07 00:44:44 +01:00

Interestingly you can go over 8 if you have geometry attributes, which is why I feel this might be a bug, unless I am misunderstanding something?

Iliya Katushenock removed this from the EEVEE & Viewport project 2024-02-07 00:46:59 +01:00

Iliya Katushenock commented

2024-02-07 00:52:23 +01:00

I can't confirm, however this issue has been reported before, see #108534. Will merge reports. Please subscribe in #108534 if you want to see further updates.

Iliya Katushenock closed this issue

2024-02-07 00:52:26 +01:00

Blender Bot added

and removed

labels 2024-02-07 00:52:27 +01:00

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