Automatic UV Rectangularize / MDATA_UVRECTANGULARIZE

[vwgamedev]

I am currently trying to find out if it is possible to run the UV Rectangulize function via Python. I can only find two references to it in the entire Python SDK MDATA_UVRECTANGULARIZE_ALIGN: int = 2280
MDATA_UVRECTANGULARIZE_EQUIDISTANT: int = 2281
and this reference in the Cinema4D C++ SDK
Unfortunately these are not mentioned in any way in the documentation and I don't understand to which c4d.MCOMMAND_* they belong.

Basically I built a script that returns each UV island as a BaseSelect, now I want to iterate over this list of BaseSelect and try to apply the rectangulize for each island. I want to avoid doing this via c4d.CallCommand(1055347) if there is another way, especially because the method via CallCommand displays the dialog box with the message in the GUI for a UV island that cannot be rectangulated and this would obviously be extremely annoying in an automated plugin.

[m_adam]

Hi sadly the only way is to use c4d.CallCommand(1055347) which does not open the window but directly execute the command.
You can change the setting as you could in the windows, by editing the value in the BaseContainer of the document.
Finally it act on the selected polygon, so the best way would be to select them.

Find bellow a script that you can execute in the script manager that will select all polygon of an object and run the command.

from typing import Optional
import c4d

doc: c4d.documents.BaseDocument  # The active document
op: Optional[c4d.BaseObject]  # The active object, None if unselected

def main() -> None:
    # Enables UV Polygon Mode if not already in any UV mode (needed for GetActiveUVSet to works)
    if doc.GetMode() not in [c4d.Muvpoints, c4d.Muvpolygons]:
        doc.SetMode(c4d.Muvpolygons)

    # Retrieves active UVSet, The UV windows need to be opened at least one time
    handle = c4d.modules.bodypaint.GetActiveUVSet(doc, c4d.GETACTIVEUVSET_ALL)
    if handle is None:
        # If fail it may be because the Texture view is not open
        # Open A texture View
        c4d.CallCommand(170103)
        # In S22 you need to update the UV Mesh
        if c4d.API_VERSION >= 22000:
            c4d.modules.bodypaint.UpdateMeshUV(False)

        # Retrieves active UVSet, The UV windows need to be opened at least one time
        handle = c4d.modules.bodypaint.GetActiveUVSet(doc, c4d.GETACTIVEUVSET_ALL)
        if handle is None:
            raise RuntimeError("There is no Active UVSet")
    
    # Select the polygon you want to operate on
    currentSel = op.GetPolygonS()
    previousSel = currentSel.GetClone() # Will be used to restore the initial selection state at the end
    currentSel.SelectAll(op.GetPolygonCount() - 1 )
    # Update the UV mesh to properly take into account the new selection
    c4d.modules.bodypaint.UpdateMeshUV(True)

    # Define the settings
    settings = doc.GetSettingsInstance(c4d.DOCUMENTSETTINGS_MODELING)
    settings[c4d.MDATA_UVRECTANGULARIZE_ALIGN] = True
    settings[c4d.MDATA_UVRECTANGULARIZE_EQUIDISTANT] = False

    # Execute the command
    c4d.CallCommand(1055347)

    # Restore the initial selection
    previousSel.CopyTo(currentSel)
    c4d.modules.bodypaint.UpdateMeshUV(True)


    c4d.EventAdd()

if __name__ == '__main__':
    main()

Cheers,
Maxime.