Geometry Axis asset node and LoadAssets

[iplai]

My script works and I got what I want, but there are two problems.

• maxon.AssetManagerInterface.LoadAssets always return False event the asset loaded successfully.

• I set the parameters of Geometry Axis by find the param's name. Is there a better way to change the parameters?

import maxon, c4d

def loadGeometryAxis(x=0, y=0, z=0, parent: c4d.BaseList2D = None):
    repository = maxon.AssetInterface.GetUserPrefsRepository()
    if not repository:
        raise RuntimeError("Could not access the user preferences repository.")
    # Geometry Axis asset id
    assetid = maxon.Id("net.maxon.neutron.asset.geo.geometryaxis")
    assetsToLoad = [(assetid, ""), ]
    sceneNodesHook = doc.FindSceneHook(c4d.SCENENODES_IDS_SCENEHOOK_ID)
    if not sceneNodesHook:
        raise RuntimeError("Could not retrieve Scene Nodes scene hook.")
    sceneNodesHook.Message(maxon.neutron.MSG_CREATE_IF_REQUIRED)
    sceneNodes = sceneNodesHook.GetNimbusRef(maxon.neutron.NODESPACE)
    if not sceneNodes:
        raise RuntimeError("Could not retrieve Scene Nodes graph model.")
    graph = sceneNodes.GetGraph()
    didLoad = maxon.AssetManagerInterface.LoadAssets(repository, assetsToLoad, graphModelRef=graph)
    if not didLoad:
        # `didLoad` is always False, event the asset loaded successfully.
        # What's wrong?
        # raise RuntimeError(f"Could not load assets for the ids: {assetsToLoad}")
        ...
    obj = doc.GetFirstObject()
    # Is there is a better way to change the parameters?
    for bc, descid, _ in obj.GetDescription(c4d.DESCFLAGS_DESC_0):
        name = bc[c4d.DESC_NAME]
        if name == "Axis X":
            obj[descid] = x
        if name == "Axis Y":
            obj[descid] = y
        if name == "Axis Z":
            obj[descid] = z
    if parent is not None:
        obj.InsertUnderLast(parent)


if __name__ == "__main__":
    cube = c4d.BaseObject(c4d.Ocube)
    loadGeometryAxis(y=1, parent=cube)
    doc.InsertObject(cube)

[Manuel]

Hi,

In this case, the asset loaded is a capsule. For capsule, the return value can be false. This looks like a bug in our API. One remark about your code, as you want to load a capsule, you do not need to pass a graphModelRef to the LoadAssets function.

How to access or change the parameter value, is a good question. To access the data, you must use the descID as you understood but the descID of capsules are exceptionally long. It seems those descID are based on either the path of the port or the ID of the port.
I asked the devs but for now, it seems that the best attribut to identify the parameter is its name. Of course, this is bad as the name will change from languages to languages.

Cheers,
Manuel

[iplai]

@manuel
Thank you very much to answer my confusion. If I do not need to pass a graphModelRef to the LoadAssets function, my code can be simplified a lot. Can it be okay to identify the parameter by the index of iterating the capsule's description. Since the capsule is newly created, and there're no extra parameters, so it seems the index is fixed.

First, get the index by following code.

for i, (bc, descid, _) in enumerate(capsule.GetDescription(c4d.DESCFLAGS_DESC_0)):
    name = bc[c4d.DESC_NAME]
    if name == "Axis X":
        print(i) # 59
    if name == "Axis Y":
        print(i) # 60
    if name == "Axis Z":
        print(i) # 61

Then, the total function def:

def loadGeometryAxis(x=0, y=0, z=0, parent: c4d.BaseObject = None):
    repository = maxon.AssetInterface.GetUserPrefsRepository()
    if not repository:
        raise RuntimeError("Could not access the user preferences repository.")
    # Geometry Axis asset id
    assetid = maxon.Id("net.maxon.neutron.asset.geo.geometryaxis")
    assetsToLoad = [(assetid, ""), ]
    maxon.AssetManagerInterface.LoadAssets(repository, assetsToLoad)
    capsule = doc.GetFirstObject()
    for i, (bc, descid, _) in enumerate(capsule.GetDescription(c4d.DESCFLAGS_DESC_0)):
        if i == 59:
            capsule[descid] = x
        if i == 60:
            capsule[descid] = y
        if i == 61:
            capsule[descid] = z
    if parent is not None:
        capsule.InsertUnderLast(parent)
    return capsule

[Dunhou]

Hi there,

In C4D 2024, the Geometry Axis can not accessible in python anymore, how can I fix that?

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:
    for i, (bc, descid, _) in enumerate(op.GetDescription(c4d.DESCFLAGS_DESC_0)):
        name = bc[c4d.DESC_NAME]
        if name == "Axis X":
            print(i,descid)
            print(op[descid])
if __name__ == '__main__':
    main()

2024

2023

Cheers~
DunHou

[m_adam]

Thanks a lot for the report !
I will need to debug it properly but it appear that there is a bug in the conversion layer when subscription is used in conjunction of nested data like the one produced by Graph.
In the meantime please use the next code:

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:
    for i, (bc, descid, _) in enumerate(op.GetDescription(c4d.DESCFLAGS_DESC_NONE)):
        name = bc[c4d.DESC_NAME]
        if name == "Axis X":
            print(op.GetParameter(descid, c4d.DESCFLAGS_GET_NONE))
            op.SetParameter(descid, 0.25, c4d.DESCFLAGS_SET_NONE)
if __name__ == '__main__':
    main()

Cheers,
Maxime.

[m_adam]

This is indeed a regression and it will be fixed in the next Cinema 4D release.

The issue is that Python was generating wrong DescId since forever in case of multiple sub level entry. Previously the system was able to return a value but due to some optimization on parameter access this was not working anymore.

Cheers,
Maxime.

[m_adam]

@Dunhou said in Geometry Axis asset node and LoadAssets:

Hi there,

In C4D 2024, the Geometry Axis can not accessible in python anymore, how can I fix that?

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:
    for i, (bc, descid, _) in enumerate(op.GetDescription(c4d.DESCFLAGS_DESC_0)):
        name = bc[c4d.DESC_NAME]
        if name == "Axis X":
            print(i,descid)
            print(op[descid])
if __name__ == '__main__':
    main()

2024

2023

Cheers~
DunHou

Hi, this issue have been fixed in 2024.2 and your code is working as it was previously.

Cheers,
Maxime.