when i use _OffsetMesh command to offset in normal direction it always offsets in the wrong (negative vertex normal) direction. The command options are set to:
If i have DynamicPreview enabled, and then turn it Off, the old preview is still shown. Btw. it does not matter which direction i choose with the preview line:
Note that i do not left click, i’m just right clicking after starting the _OffsetMesh command to use the last offset distance. If i have DynamicPreview enabled and left click, it works. But i always have this Off since it’s very slow with large meshes.
Is this a bug maybe ? (8.19.25112.13001, 2025-04-22)
Thanks for you feedback. I encountered the same issue in Rhino 8.20. I want to confirm: you want the previouse preview state to not be displayed when DynamicPreview=No, right ?
Hi @jessesn, the preview should not be visible if it is set to Off imho. But the main problem is that i cannot just press Enter, it always extrudes in the wrong direction.
I tried your situation in version 8 and WIP version 9 from April 22. DynamicPreview does not disappear from the viewport if you turn it on for the first time and then turn it off - it is always visible. This is a bug, but the documentation describes it as the correct action (who came up with this?) DynamicPreview Yes
The preview follows the mouse cursor.
Left-click offsets the mesh to the preview location.
Right-click offsets the mesh to the input distance. No
The preview is static at the input distance. The cursor location does not affect to the result.
As for the offset in the wrong direction. I played with the AverageNormals parameter, if you turn it on (Yes), the offset direction is always correct. However, this will only work correctly on flat surfaces, as this setting scales the mesh based on the normals of each vertex.
Conclusion: OffsetMesh does not work correctly with the offset distance in both version 8 and version 9 WIP. Also, the preview of the result requires improvement - if it is turned off, it should not be visible.
(who came up with this?)