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RBD Paint issue: Shows strokes but doesn't apply 2026年5月20日5:13
Thank you so much for the detailed explanation!
Your insights cleared up the mystery. Now I understand what was happening under the hood with the hidden display node (negative index output) and the viewport flag bug. It is a huge relief to know that the actual data was fine and it was just a viewing issue.
Your insights cleared up the mystery. Now I understand what was happening under the hood with the hidden display node (negative index output) and the viewport flag bug. It is a huge relief to know that the actual data was fine and it was just a viewing issue.
RBD Paint issue: Shows strokes but doesn't apply 2026年5月20日2:53
Thank you for the quick response.
To answer your question about the attribute: Yes, the values in the Geometry Spreadsheet are indeed changing and varying (e.g., shifting between 0 and 1) when I stroke with the brush. The data itself seems to be written correctly, but nothing is being rendered or visualized in the 3D viewport—it remains completely gray.
Additionally, I noticed a very strange behavior regarding how this node cooks the geometry:
Initial State: My upstream Box SOP has its Axis Divisions set to 10. However, the moment I select the RBD Paint SOP, all division lines disappear from the viewport, and the point count in the Geometry Spreadsheet drops to 8 (behaving like a default proxy box).
The Phenomenon: If I go to the Geometry tab at the bottom of the RBD Paint parameters, toggle the Division Size checkbox ON, and then toggle it OFF, the original Box divisions suddenly reappear. The point count in the spreadsheet also instantly jumps from 8 back to the original number.
Even after forcing the geometry to update this way, the painted color still refuses to show up in the viewport.
I am using build 19.0.720 to match the older version 19 tutorial that I am currently following.
I have attached the .hip file where this issue occurs. It would be greatly appreciated if you could look into it.
To answer your question about the attribute: Yes, the values in the Geometry Spreadsheet are indeed changing and varying (e.g., shifting between 0 and 1) when I stroke with the brush. The data itself seems to be written correctly, but nothing is being rendered or visualized in the 3D viewport—it remains completely gray.
Additionally, I noticed a very strange behavior regarding how this node cooks the geometry:
Initial State: My upstream Box SOP has its Axis Divisions set to 10. However, the moment I select the RBD Paint SOP, all division lines disappear from the viewport, and the point count in the Geometry Spreadsheet drops to 8 (behaving like a default proxy box).
The Phenomenon: If I go to the Geometry tab at the bottom of the RBD Paint parameters, toggle the Division Size checkbox ON, and then toggle it OFF, the original Box divisions suddenly reappear. The point count in the spreadsheet also instantly jumps from 8 back to the original number.
Even after forcing the geometry to update this way, the painted color still refuses to show up in the viewport.
I am using build 19.0.720 to match the older version 19 tutorial that I am currently following.
I have attached the .hip file where this issue occurs. It would be greatly appreciated if you could look into it.
RBD Paint issue: Shows strokes but doesn't apply 2026年5月19日2:12
Hello!
I am currently setting up an RBD simulation at the SOP level and using the RBD Paint node to paint the active attribute on a fractured mesh.
However, I am experiencing an issue where the node fails to actually paint. The brush cursor itself seems to correctly snap to and follow the surface of the geometry. But when I click and drag to paint, it only leaves behind the stroke path (the drawn lines/curves), and the actual paint effect (color/attribute change) is not applied to the mesh at all.
This issue is highly inconsistent. Sometimes the node works perfectly fine, but other times it behaves like this, only showing the stroke curves without actually painting anything.
Is this a known viewport/display bug, or could it be related to the geometry's prerequisites (such as topology or normals) causing the paint projection to fail? Any insights or workarounds would be greatly appreciated.
Environment:
Houdini 19.0.720
Windows 11
I am currently setting up an RBD simulation at the SOP level and using the RBD Paint node to paint the active attribute on a fractured mesh.
However, I am experiencing an issue where the node fails to actually paint. The brush cursor itself seems to correctly snap to and follow the surface of the geometry. But when I click and drag to paint, it only leaves behind the stroke path (the drawn lines/curves), and the actual paint effect (color/attribute change) is not applied to the mesh at all.
This issue is highly inconsistent. Sometimes the node works perfectly fine, but other times it behaves like this, only showing the stroke curves without actually painting anything.
Is this a known viewport/display bug, or could it be related to the geometry's prerequisites (such as topology or normals) causing the paint projection to fail? Any insights or workarounds would be greatly appreciated.
Environment:
Houdini 19.0.720
Windows 11