Creating an Xpresso node

[Helper]

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 28/10/2010 at 21:24, xxxxxxxx wrote:

User Information:
Cinema 4D Version:   12 
Platform:   Windows  ;   
Language(s) :       PYTHON  ;

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I want to dynamically create an XPresso node which references the current active material (or some other object).

Using the python code below successfully creates a node, but it seems to reference the object the Xpresso tag belongs to by default (Cube).   The code tries to use SetLink to change the object reference to a material, however in the Xpresso editor it still references the original Cube object.

Any idea how to create a node which references a specific object?

Aside: I saw the note about using GetParameter rather than GetDataInstance, but Python doesn't seem to support that method.

_
_def main() :
  # Get Node master for selected Xpresso tag
  nm = doc.GetActiveTag().GetNodeMaster()

# This creates a Xpresso reference node
  # to the Cube object containing the active tag
  node = nm.CreateNode(nm.GetRoot(), c4d.ID_OPERATOR_OBJECT)

# prints out 'Cube' as the node link
  print node.GetOperatorContainer()[c4d.GV_OBJECT_OBJECT_ID].GetName()

# Attempt to reference the active material instead
  con = node.GetOperatorContainer()
  con.SetLink(c4d.GV_OBJECT_OBJECT_ID, doc.GetActiveMaterial())
  node.SetOperatorContainer(con)

# prints out 'Mat' as the node link
  print node.GetOperatorContainer()[c4d.GV_OBJECT_OBJECT_ID].GetName()

# Add the new node to root XGroup
  nm.InsertLast(nm.GetRoot(), node)

# Node is now added to XPresso but is still a reference to Cube

[Helper]

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 29/10/2010 at 01:18, xxxxxxxx wrote:

Hi Trelane, please try:

mat = doc.GetActiveMaterial()
if mat==None: return
node[c4d.GV_OBJECT_OBJECT_ID]=mat

Cheers, Seb

[Helper]

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 29/10/2010 at 07:55, xxxxxxxx wrote:

Sebastian, thank you for the quick response, that worked!

Another question if I may.  The Layer shader is behaving strangely.  I'm trying to get at the shaders within a layer, but iterating over the layer container causes c4d to crash!   Here is some sample code that crashes:

Before running, create material with Layer shader in reflection channel and add some layers

def main() :
  # Get the Layer shader object inside material
  mat = doc.GetActiveMaterial()
  if mat==None: return
  layerShader = mat[c4d.MATERIAL_REFLECTION_SHADER]
  if layerShader==None: return

# Prints 'Layer' so everything is fine up to here
  print layerShader.GetName()

# layerShader is not iterable so display container
  con = layerShader.GetDataInstance()
  for k,v in con:
      print k,v

# crash!

[Helper]

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

On 29/10/2010 at 09:35, xxxxxxxx wrote:

Can you please post a file so I can reproduce the crash? Here everything works as expected.
Cheers, Sebastian