SOLVED Volume Builder Index returning None

falcon

Hello all,

I have been trying to create an automation script to help with a rather repetitive task involving volume builders. However, I am quite stuck in regards with how to change the mode of the objects in the Volume Builder.

Another issue I am having is in regards to the VolumeBuilder python page:

I cannot seem to get any of these functions to work. I am trying to change the mix mode. I have tried a few functions and they keep returning none. I suspect that I may not fully understand how to call indexes properly (I am just treating them as an integer at the moment where 0 is the first child and so on)

An example of a little debugging where I have 4 objects as a child of the VolumeBuilder (Which is active after being created, so I just assign it then (Which is probably super lazy of me) )

volBuilder = doc.GetActiveObject()
DEBUG = volBuilder.GetInputObject(1)
    print("DEBUG = "+str(DEBUG))

The resulting print:

DEBUG = None

Also, I was wondering if accessing the Objects attribute possible with Python? i.e. creating folders, arranging (Without pulling the object out and then inserting it again)

All the best,

Hayden.

m_magalhaes

Hi,

Based on our examples on github, i've create that script that will do some operation on the MeshBuilder:

Note that, to change the "mix mode" you must use the right fonction for the right volume type:

SDF -> SetBoolMode
Fog -> SetMixMode
vector -> SetMixVectorMode
Note that the flags are different for each function.

Adding folder is possible with sending a message but after that you can't rename it or add a child to this folder.

import c4d
from c4d import gui
# Welcome to the world of Python


# Script state in the menu or the command palette
# Return True or c4d.CMD_ENABLED to enable, False or 0 to disable
# Alternatively return c4d.CMD_ENABLED|c4d.CMD_VALUE to enable and check/mark
#def state():
#    return True

# Main function
def main():
# Creates volume builder object
    volumeBuilder = c4d.BaseObject(c4d.Ovolumebuilder)
    if volumeBuilder is None:
        raise Exception('Could not create Volume Builder object')

    # Inserts volume builder into the active document
    doc.InsertObject(volumeBuilder, None, None)
    doc.SetActiveObject(volumeBuilder)

    # Creates a cube object
    cube = c4d.BaseObject(c4d.Ocube)
    if cube is None:
        raise Exception('Could not create cube object')
    
    capsule = c4d.BaseObject(c4d.Ocapsule)
    capsule.SetRelPos(c4d.Vector(0,100,0))

    # Inserts cube into the active document
    capsule.InsertUnder(volumeBuilder)
    cube.InsertUnder(volumeBuilder)
    
    

    # Adds cube object to the volume builder
    ret = volumeBuilder.AddSceneObject(cube)
    if not ret:
        raise Exception('Could not add scene object')
    ret = volumeBuilder.AddSceneObject(capsule)
    if not ret:
        raise Exception('Could not add scene object')

    # Retrieves cube's volume builder settings container
    settings = volumeBuilder.GetSettingsContainerForObject(capsule)
    if settings is None:
        raise Exception('Could not access settings')

    # Configures cube's settings
    settings[c4d.ID_VOLUMEBUILDER_TAG_USEPOINTS] = True
    settings[c4d.ID_VOLUMEBUILDER_TAG_MESHRADIUS] = 10.0

    volumeBuilder.SetBoolMode(0, c4d.BOOLTYPE_DIFF)
    
    inputCount = volumeBuilder.GetInputObjectCount()
    if inputCount == 0:
        raise RuntimeError("There is no input object for this volume builder.")

    # Iterates over all objects used in the volume builder
    for i in range(inputCount):
        # Retrieves the object
        inputObject = volumeBuilder.GetInputObject(i)
        if inputObject is None: continue

        # Prints the names and if it's a child of something else in the volume builder
        name = inputObject.GetName()
        print(name, i)

        if volumeBuilder.InputObjectIsChild(i):
            print("child object")

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

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

m_magalhaes

Hi,

Based on our examples on github, i've create that script that will do some operation on the MeshBuilder:

Note that, to change the "mix mode" you must use the right fonction for the right volume type:

SDF -> SetBoolMode
Fog -> SetMixMode
vector -> SetMixVectorMode
Note that the flags are different for each function.

Adding folder is possible with sending a message but after that you can't rename it or add a child to this folder.

import c4d
from c4d import gui
# Welcome to the world of Python


# Script state in the menu or the command palette
# Return True or c4d.CMD_ENABLED to enable, False or 0 to disable
# Alternatively return c4d.CMD_ENABLED|c4d.CMD_VALUE to enable and check/mark
#def state():
#    return True

# Main function
def main():
# Creates volume builder object
    volumeBuilder = c4d.BaseObject(c4d.Ovolumebuilder)
    if volumeBuilder is None:
        raise Exception('Could not create Volume Builder object')

    # Inserts volume builder into the active document
    doc.InsertObject(volumeBuilder, None, None)
    doc.SetActiveObject(volumeBuilder)

    # Creates a cube object
    cube = c4d.BaseObject(c4d.Ocube)
    if cube is None:
        raise Exception('Could not create cube object')
    
    capsule = c4d.BaseObject(c4d.Ocapsule)
    capsule.SetRelPos(c4d.Vector(0,100,0))

    # Inserts cube into the active document
    capsule.InsertUnder(volumeBuilder)
    cube.InsertUnder(volumeBuilder)
    
    

    # Adds cube object to the volume builder
    ret = volumeBuilder.AddSceneObject(cube)
    if not ret:
        raise Exception('Could not add scene object')
    ret = volumeBuilder.AddSceneObject(capsule)
    if not ret:
        raise Exception('Could not add scene object')

    # Retrieves cube's volume builder settings container
    settings = volumeBuilder.GetSettingsContainerForObject(capsule)
    if settings is None:
        raise Exception('Could not access settings')

    # Configures cube's settings
    settings[c4d.ID_VOLUMEBUILDER_TAG_USEPOINTS] = True
    settings[c4d.ID_VOLUMEBUILDER_TAG_MESHRADIUS] = 10.0

    volumeBuilder.SetBoolMode(0, c4d.BOOLTYPE_DIFF)
    
    inputCount = volumeBuilder.GetInputObjectCount()
    if inputCount == 0:
        raise RuntimeError("There is no input object for this volume builder.")

    # Iterates over all objects used in the volume builder
    for i in range(inputCount):
        # Retrieves the object
        inputObject = volumeBuilder.GetInputObject(i)
        if inputObject is None: continue

        # Prints the names and if it's a child of something else in the volume builder
        name = inputObject.GetName()
        print(name, i)

        if volumeBuilder.InputObjectIsChild(i):
            print("child object")

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

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

falcon

@m_magalhaes Thank you so much for putting this togeather. It really helped me in working out where I was going wrong!

Thank you,

Hayden.

ferdinand

Hello @falcon,

without further questions or replies, we will consider this topic as solved by Monday, the 30th and flag it accordingly.

Thank you for your understanding,
Ferdinand