Struggling on SetParameter for OLight

mocoloco

Hello there!

I'm starting a new TAG plugin development and I would like to affect OLight parameter, i.e. c4d.LIGHT_COLOR, but my DescId does not reach its target.

All this is happening in dataTag.Execute.

Here the code, and the GetParameter returns only None, which means there is something wrong...

 # TAG Execute() method
def Execute(self, tag, doc, op, bt, priority, flags):
    self.tagData = tag.GetDataInstance()
    sim_color = c4d.Vector(0) # For debug purpose, set a black color value

    if op.GetType() == c4d.Olight:
        # For debug purpose  
        print( op.GetParameter( c4d.DescID(c4d.DescLevel(c4d.LIGHT_COLOR, c4d.DTYPE_COLOR, 0)), c4d.DESCFLAGS_GET_PARAM_GET ) )

        op.SetParameter( c4d.DescID(c4d.DescLevel(c4d.LIGHT_COLOR, c4d.DTYPE_COLOR, 0)), sim_color, c4d.DESCFLAGS_SET_USERINTERACTION )
    
        return c4d.EXECUTIONRESULT_OK

I tried different flags for SetParameter, but based on @ferdinand explanation on CTrack, it seems that c4d.DESCFLAGS_SET_USERINTERACTION is the good one.

If someone can light me up on this, that would be awesome.

Cheers,
Christophe

mocoloco

Little addition after looking for a solution and reading more on OLight, it seems that the correct data type is c4d.DTYPE_VECTOR instead of c4d.DTYPE.COLOR. But even with this I can't reach the value.

 # TAG Execute() method
def Execute(self, tag, doc, op, bt, priority, flags):
    self.tagData = tag.GetDataInstance()
    sim_color = c4d.Vector(0) # For debug purpose, set a black color value

    if op.GetType() == c4d.Olight:
        # For debug purpose  
        print( op.GetParameter( c4d.DescID(c4d.DescLevel(c4d.LIGHT_COLOR, c4d.DTYPE_VECTOR, 0)), c4d.DESCFLAGS_GET_PARAM_GET ) )

        op.SetParameter( c4d.DescID(c4d.DescLevel(c4d.LIGHT_COLOR, c4d.DTYPE_VECTOR, 0)), sim_color, c4d.DESCFLAGS_SET_USERINTERACTION )
    
        return c4d.EXECUTIONRESULT_OK

m_adam

Hi @mocoloco for such a parameter, using the bracket operator will be more easy.
Find bellow the code within a Python Scripting tag, this work as expected.

from typing import Optional
import c4d

doc: c4d.documents.BaseDocument # The document evaluating this tag
op: c4d.BaseTag # The Python scripting tag
flags: int # c4d.EXECUTIONFLAGS
priority: int # c4d.EXECUTIONPRIORITY
tp: Optional[c4d.modules.thinkingparticles.TP_MasterSystem] # Particle system
thread: Optional[c4d.threading.BaseThread] # The thread executing this tag

def main() -> None:
    obj = op.GetObject()
    previousLightColor = obj[c4d.LIGHT_COLOR]
    print(previousLightColor)
    newLightColor = c4d.Vector(0.0, 1.0, 1.9)
    obj[c4d.LIGHT_COLOR] = newLightColor

But if you really want to use G/SetParameter you can do it with the code bellow. The issue with your code is that DESCFLAGS_GET_PARAM_GET mean to be used within the implementation to notify the system that this parameter have been already retrieved so no need to retrieve it again. So if you pass this flag as an input therefor you will have nothing in return.

    obj = op.GetObject()
    previousLightColor = obj.GetParameter(c4d.DescID(c4d.DescLevel(c4d.LIGHT_COLOR, c4d.DTYPE_VECTOR, 0)), c4d.DESCFLAGS_GET_NONE)
    print(previousLightColor)
    newLightColor = c4d.Vector(0.0, 0.0, 1.9)
    obj.SetParameter( c4d.DescID(c4d.DescLevel(c4d.LIGHT_COLOR, c4d.DTYPE_VECTOR, 0)), newLightColor, c4d.DESCFLAGS_SET_NONE )

Cheers,
Maxime.

mocoloco

Hi @m_adam,

Thanks a lot for the flags, it does work as expected now.
Are c4d.DESCFLAGS_GET_NONE and c4d.DESCFLAGS_GET_0 similars?

Cheers,
Christophe.