One pixel output when sending a value through a node group into a mix node. #93013

Closed
opened 2021-11-11 14:56:07 +01:00 by Jalen Jobes · 7 comments

{F11793765}System Information
Operating system: Windows 10
CPU: Ryzen 7 3700x
Graphics card: RTX 2070 SUPER

Blender Version
Broken: 2.93.4, b720503lcec4, master, 2021-08-31
Worked: Unsure if it ever did. I'm fairly new.

Short description of error
Mix node with the exact same set up produces a one pixel result merely by grouping value nodes.

Exact steps for others to reproduce the error

  1. In the compositor; I have a subtract node plugged into a divide node, the values are irrelevant but I'm subtracting x value input by negative 100 then dividing by 100.
  2. The divide node is plugged into either socket of the mix node, the other mix value is irrelevantt but I have it set at white. When this mix node is viewed a full image is displayed.
  3. Duplicate the three nodes, but group the subtract and divide nodes and the new mix node outputs a single pixel.

KNOWN ISSUE: https://developer.blender.org/T48297 - The problem is the "Buffer Groups" option. Untoggling is a work around but now none of the groups are buffered solely for one value to work.

{[F11793765](https://archive.blender.org/developer/F11793765/setup.png)}**System Information** Operating system: Windows 10 CPU: Ryzen 7 3700x Graphics card: RTX 2070 SUPER **Blender Version** Broken: 2.93.4, b720503lcec4, master, 2021-08-31 Worked: Unsure if it ever did. I'm fairly new. **Short description of error** Mix node with the exact same set up produces a one pixel result merely by grouping value nodes. **Exact steps for others to reproduce the error** 1. In the compositor; I have a subtract node plugged into a divide node, the values are irrelevant but I'm subtracting x value input by negative 100 then dividing by 100. 2. The divide node is plugged into either socket of the mix node, the other mix value is irrelevantt but I have it set at white. When this mix node is viewed a full image is displayed. 3. Duplicate the three nodes, but group the subtract and divide nodes and the new mix node outputs a single pixel. KNOWN ISSUE: https://developer.blender.org/T48297 - The problem is the "Buffer Groups" option. Untoggling is a work around but now none of the groups are buffered solely for one value to work.
Author

Added subscriber: @RealJayJobes

Added subscriber: @RealJayJobes
Member

Added subscriber: @lichtwerk

Added subscriber: @lichtwerk
Member

Changed status from 'Needs Triage' to: 'Needs User Info'

Changed status from 'Needs Triage' to: 'Needs User Info'
Member

Hi and thx for the report!

Isnt this a duplicate of #48297 (Scalar Group Node Output is One Pixel Large) then?
If not, please provide an example .blend file demonstration the issue, thx in advance.

Hi and thx for the report! Isnt this a duplicate of #48297 (Scalar Group Node Output is One Pixel Large) then? If not, please provide an example .blend file demonstration the issue, thx in advance.
Author

In #93013#1252818, @lichtwerk wrote:
Hi and thx for the report!

Isnt this a duplicate of #48297 (Scalar Group Node Output is One Pixel Large) then?
If not, please provide an example .blend file demonstration the issue, thx in advance.

Yes, my apologies! I didn't realize it was until after I made the report and did some further refined searches. I couldn't figure out how to delete my report so I added a link to the other one assuming someone would when they saw it was a duplicate.

> In #93013#1252818, @lichtwerk wrote: > Hi and thx for the report! > > Isnt this a duplicate of #48297 (Scalar Group Node Output is One Pixel Large) then? > If not, please provide an example .blend file demonstration the issue, thx in advance. Yes, my apologies! I didn't realize it was until after I made the report and did some further refined searches. I couldn't figure out how to delete my report so I added a link to the other one assuming someone would when they saw it was a duplicate.
Member

Ah, OK, thx getting back, will merge then.

Ah, OK, thx getting back, will merge then.
Member

Closed as duplicate of #48297

Closed as duplicate of #48297
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Reference: blender/blender#93013
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