4. detect a material has changed

detect a material has changed

  • H

    On 25/08/2014 at 12:51, xxxxxxxx wrote:

    Hi there,

    how can I detect that the user has changed a property of a shader which is used in a material? For example in the color channel.

    Thanks in advance
    Martin

    0
  • H

    On 25/08/2014 at 15:23, xxxxxxxx wrote:

    Hi Monkeytack,

    I don't think there's a built-in method for detecting that specific change. In similar situations (detecting changes in Layer Selection, etc) - I've cached a copy of the object I'm monitoring and then checked it against the live copy every time there's a c4d.EVMSG_CHANGE message.

    -Donovan

    0
  • H

    On 28/08/2014 at 04:27, xxxxxxxx wrote:

    thanks for the reply!

    do you have an example script?
     I was not able to implement your description?

    I have a tag plugin and I want to notify changes of the material which is, as the tag plugin, assigned to an object.
    How can I notify an EventMessage in my tag plugin and do the cache?

    Martin

    0
  • H

    On 28/08/2014 at 13:07, xxxxxxxx wrote:

    Hello,

    a tag's Execute function is called pretty much every time something happens in the scene. So you could check there if the material's dirty state changed:

      
class ExamplePythonTag(plugins.TagData) :  
   
  materialDirtyStatus = 0  
    
  def Init(self, node) :  
      # init your plugin here  
      return True  
        
    
  def Execute(self, tag, doc, op, bt, priority, flags) :  
        
      # search for texture tag  
      textureTag = op.GetTag(c4d.Ttexture)  
      if textureTag != None:  
        
          # get material  
          material = textureTag.GetMaterial()  
          if material != None:  
                
              # get dirty state  
              dirty = material.GetDirty(c4d.DIRTY_DATA)  
                
              # compare  
              if dirty != self.materialDirtyStatus:  
                  print("material changed...")  
                  self.materialDirtyStatus = dirty  
    
        
      return c4d.EXECUTIONRESULT_OK

    best wishes,
    Sebastian

    0
  • H

    On 02/09/2014 at 02:47, xxxxxxxx wrote:

    Hello Sebastian,

    thank you for the reply!
    It works !

    best wishes
    Martin

    0
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