Noodles connected to vector math node may become invalid but remain connected after mode change #83269

New Issue

Micah Matichuk · 2020-12-01T08:05:43+01:00

Micah Matichuk commented

2020-12-01 08:05:43 +01:00

System Information
Operating system: Windows 10 20H2
Graphics card: NVIDIA RTX 2070 Super
(Other systems have exhibited identical behavior.)

Blender Version
Broken: 2.91.0

Short description of error
When the vector output of a vector math node set to cross product (or any other mode offering a vector output type) is connected to another node's input, and the mode of the vector math node is changed to one such as dot product offering only a scalar output (or vice versa), the connection between nodes is not completely severed, though the noodle seems to disappear. The invalid connection can cause visual artifacts in the render. If the user clicks on the input of the node that the vector math node was plugged into, and drags, the noodle once again appears, and it is possible to sever the connection or plug it into another input.

Exact steps for others to reproduce the error
The issue can be replicated simply as follows:
Start Blender, open the shader editor (change to world shader or create a material to edit), add a vector math node and plug the default vector-type output into any input (such as "surface" of the world output). Now change the vector math node to a mode with scalar output type, such as dot product. The noodle will disappear. Now click on the input dot where the noodle had ended, and drag. The noodle will reappear.

Another interesting observation is that if the vector math node is moved after its mode is changed, and the invalidated noodle is made to reappear (by dragging its endpoint), its starting point remains at the original location of the vector math node.

In addition, the receiving socket remains "occupied" (in that it will not display the input field as if it was unconnected).

The included .blend contains a vector math node that has both invisible inputs and outputs. To see the noodles reappear, switch the vector math node to "Scale" mode.

phantom_noodles.blend

**System Information** Operating system: Windows 10 20H2 Graphics card: NVIDIA RTX 2070 Super (Other systems have exhibited identical behavior.) **Blender Version** Broken: 2.91.0 **Short description of error** When the vector output of a vector math node set to cross product (or any other mode offering a vector output type) is connected to another node's input, and the mode of the vector math node is changed to one such as dot product offering only a scalar output (or vice versa), the connection between nodes is not completely severed, though the noodle seems to disappear. The invalid connection can cause visual artifacts in the render. If the user clicks on the input of the node that the vector math node was plugged into, and drags, the noodle once again appears, and it is possible to sever the connection or plug it into another input. **Exact steps for others to reproduce the error** The issue can be replicated simply as follows: Start Blender, open the shader editor (change to world shader or create a material to edit), add a vector math node and plug the default vector-type output into any input (such as "surface" of the world output). Now change the vector math node to a mode with scalar output type, such as dot product. The noodle will disappear. Now click on the input dot where the noodle had ended, and drag. The noodle will reappear. Another interesting observation is that if the vector math node is moved after its mode is changed, and the invalidated noodle is made to reappear (by dragging its endpoint), its starting point remains at the original location of the vector math node. In addition, the receiving socket remains "occupied" (in that it will not display the input field as if it was unconnected). The included .blend contains a vector math node that has both invisible inputs and outputs. To see the noodles reappear, switch the vector math node to "Scale" mode. [phantom_noodles.blend](https://archive.blender.org/developer/F9418387/phantom_noodles.blend)

Micah Matichuk commented

2020-12-01 08:05:43 +01:00

Added subscriber: @Micahchuk

blender-admin commented

2020-12-01 08:05:43 +01:00

#94730 was marked as duplicate of this issue

blender-admin commented

2020-12-01 08:05:43 +01:00

#93269 was marked as duplicate of this issue

Robert Guetzkow commented

2020-12-01 12:05:51 +01:00

Added subscribers: @JulianEisel, @JacquesLucke, @rjg

Robert Guetzkow commented

2020-12-01 12:05:51 +01:00

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

Robert Guetzkow closed this issue

2020-12-01 12:05:51 +01:00

Robert Guetzkow self-assigned this 2020-12-01 12:05:51 +01:00

Robert Guetzkow commented

2020-12-01 12:05:51 +01:00

The hidden connection when switching operations is intentional, however being able to edit it by clicking on the socket it was connected to seems wrong.

@JacquesLucke @JulianEisel Is this the expected behavior?

The hidden connection when switching operations is intentional, however being able to edit it by clicking on the socket it was connected to seems wrong. @JacquesLucke @JulianEisel Is this the expected behavior?

Robert Guetzkow commented

2020-12-01 12:05:59 +01:00

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

Robert Guetzkow reopened this issue

2020-12-01 12:05:59 +01:00

Robert Guetzkow removed their assignment 2020-12-01 12:08:29 +01:00

Philipp Oeser commented

2021-03-19 17:28:21 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2021-03-19 17:28:21 +01:00

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

Philipp Oeser commented

2021-03-19 17:28:21 +01:00

Will confirm this for now.
In addition, the receiving socket remains "occupied" (in that it will not display the input field as if it was unconnected).

Will confirm this for now. In addition, the receiving socket remains "occupied" (in that it will not display the input field as if it was unconnected).

Richard Antalik commented

2021-11-24 10:16:11 +01:00

Added subscribers: @DEBIHOOD, @iss

Richard Antalik commented

2022-01-08 06:54:24 +01:00

Added subscriber: @MysteryPancake

Pratik Borhade commented

2022-01-27 08:51:59 +01:00

Added subscriber: @PratikPB2123

Pratik Borhade commented

2022-01-27 08:51:59 +01:00

Usually duplicate report is expected to be merged in the older one.
But #89387 has more clear instructions with explicit info about the issue.
So I will merge this report into #89387. Thanks for the report!
(Philipp also agreed about this)

Usually duplicate report is expected to be merged in the older one. But #89387 has more clear instructions with explicit info about the issue. So I will merge this report into `#89387`. Thanks for the report! (Philipp also agreed about this)

Pratik Borhade commented

2022-01-27 08:52:33 +01:00

Closed as duplicate of #89387

Pratik Borhade closed this issue

2022-01-27 08:52:33 +01:00

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Noodles connected to vector math node may become invalid but remain connected after mode change #83269