Thank you @zipit
I adopted your solution into our code and it works exactly as expected.
Thank you for your help.
Best regards,
Tomasz

Hi @zipit
Thank you for your clarification.
Is there any other way of doing that? Currently, I'm trying to modify projection for existing takes, but if there is a way to do it from scratch when the take is created - that could work for now.
Basically what I'm trying to do is to create multiple different takes per room, and for every take - apply the same material to different floor meshes (so if you're in bedroom1 and you change carpet - the carpet material would change on all other defined the rooms)
I don' mind to send you my current code + files we use to generate the takes, but that's not something I would be able to share on the public forum.
Best regards,
Tomasz

Hi @zipit Not sure what do you mean. The problem is not related to animation.
I recorded my screen when tried your solution, and shared with you the results of the script, which were not what I was expecting - the projection stays "Spherical" after running the script in the Script Manager.

Hi @zipit,
I'm sorry if I wasn't clear what I was trying to achieve. I used your updated script and recorded a short gif, which shows, the projection materials I'm trying to change in takes stays the same after running the script. I'm expecting the projection to change from current Spherical to new UVW Mapping. What am I missing?

Best regards,
Tomasz

@zipit said in Changing material projection in takes using Python:

TEXTURETAG_PROJECTION_UVW on the selected objects texture tag.
"""
import c4d

def main():
    # Checks if there is an active object.
    if op is None:
        raise ValueError("op is none, please select one object.")

    # Gets the TakeData from the active document (holds all information about 
    # Takes)
    takeData = doc.GetTakeData()
    if takeData is None:
        raise RuntimeError("Failed to retrieve the take data.")

    # Gets the active Take and check it's not the main one
    take = takeData.GetCurrentTake()
    if take.IsMain():
        raise RuntimeError("The selected take is already the main one.")

    # Gets the material tag of the cube.
    tag = op.GetTag(c4d.Ttexture)
    if tag is None:
        raise RuntimeError("Blah, no texture tag on selected object.")
    
    # The single level DescId for the projection parameter.
    descId = c4d.DescID(
        c4d.DescLevel(c4d.TEXTURETAG_PROJECTION, c4d.DTYPE_LONG, 0))
    newValue = c4d.TEXTURETAG_PROJECTION_UVW
    
    # Add an override if this parameter is not already overridden, otherwise 
    # returns the already existing override.
    overrideNode = take.FindOrAddOverrideParam(
        takeData, tag, descId, newValue)
    if overrideNode is None:
        raise RuntimeError("Failed to find the override node.")

    # Updates the scene with the new Take
    overrideNode.UpdateSceneNode(takeData, descId)

    # Pushes an update event to Cinema 4D
    c4d.EventAdd()


if __name__ == '__main__':
    main()```

Thank you @zipit
I've tried as suggested but still doesn't seems to be working the way I wanted.
I modified my code and included your suggestions, as well as my test scene, so you can see what's my issue. I bet it's something simple ;-).

import c4d
import os
from c4d import documents

listOfParentTakes = []
listOfChildTakes = []
objects = ["Plane","Plane.1","Plane.2"]


def GetListOfParentTakes():
    takeData = doc.GetTakeData()
    if takeData is None:
        return

    mainTake = takeData.GetMainTake()
    take = mainTake.GetDown()

    while take is not None:
        listOfParentTakes.append((take))
        take = take.GetNext()

def GetListOfChildrenTakes():
    for parent in listOfParentTakes:
        take = parent.GetDown()

        while take is not None:
            listOfChildTakes.append(take)
            take = take.GetNext()

# Main function

def main():

    c4d.CallCommand(13957)  # Clear Console
    doc = documents.GetActiveDocument()
    takeData = doc.GetTakeData()
    GetListOfParentTakes()
    GetListOfChildrenTakes()
    if takeData is not None:
        for el in listOfChildTakes:
            print ("Current take name : "+ el.GetName())
            takeData.SetCurrentTake(el)

            for currentObject in objects:
                obj = doc.SearchObject(currentObject)
                if obj is not None:
                    # Gets the material tag of the cube.
                    tag = obj.GetTag(c4d.Ttexture)
                    if tag is None:
                        raise RuntimeError("Blah, no texture tag on selected object.")
                        # The single level DescId for the projection parameter.
                    descId = c4d.DescID(c4d.DescLevel(c4d.TEXTURETAG_PROJECTION, c4d.DTYPE_LONG, 0))
                    newValue = c4d.TEXTURETAG_PROJECTION_UVW

                    # Add an override if this parameter is not already overridden, otherwise
                    # returns the already existing override.
                    overrideNode = el.FindOrAddOverrideParam(
                        takeData, tag, descId, newValue)
                    if overrideNode is None:
                        raise RuntimeError("Failed to find the override node.")


# Execute main()
if __name__=='__main__':
    main()

TakeProjectionTest.c4d

Hi,
I've been trying to change material projection for the materials added to take system, but it doesn't seem to be working. I can generate takes, add material tags, but when trying to change default spherical projection into uwv (using textag[c4d.TEXTURETAG_PROJECTION] = 6) - there is no effect. I also tried to move the code after group tag, and even make the current take active, and then modify the value of the projection - still the projection stays the same as before modification. I spent a few hours trying to find what's wrong , but unable to find any solution :-(
Here is my code snippet. Would be grateful if anyone could help me, by pointing me in the right direction.

    if len(listOfMaterials2Swap) > 0:
        for mat in listOfMaterials2Swap:
            matOnTheScene = doc.SearchMaterial(mat)
            if matOnTheScene is None:
                print ("Mat : " + mat + " not found on the scene")
                quit()
            else:
                #print ("Creating take for mat: " + mat)
                if takeData is not None:
                    materialTake = takeData.AddTake(roomName + "_" + mat, parentTake, None)
                    if materialTake != None:
                        group = materialTake.AddOverrideGroup()
                        group.SetName("Take for " + roomName + "_" + mat)
                        group.SetEditorMode(c4d.MODE_ON)
                        group.SetRenderMode(c4d.MODE_ON)
                        textag = c4d.TextureTag()

                        for currentMeshName in listOfMeshes4MatSwap:
                            currentMesh = doc.SearchObject(currentMeshName)
                            currentMesh.KillTag(5616)
                            currentMesh.InsertTag(textag) #Remove texture tag for current object, if already there
                            textag[c4d.TEXTURETAG_PROJECTION] = 6 #Change current projection to UVW

                            group.AddToGroup(takeData, currentMesh)
                            group.AddTag(takeData,c4d.Ttexture,matOnTheScene)