Python: paste relative references (for ramp)

[JJ FX]

Hi, 

So I cannot figure out how with python create a relative referenced ramp. The closest I got is to this:

# pseudocode

controller = 'my_controller_node'
target = 'polyextrude_node'
path = target.relativePathTo(controller) # or the other way around

controllerRamp = controller.parm('thicknessramp')
targetRamp = target.parm('thicknessramp')

# store the current ramp:
keys = targetRamp.evalAsRamp().keys()
values = targetRamp.evalAsRamp().values()

# set the expression on the thicknessramp parameter
expression = 'ch("' + path + '/' + controllerRamp.name() + '")'
targetRamp.setExpression(expression)

# now the ramp is all broken, so I'm restoring the control points and give them expressions too
for i in range(len(keys)):
    key = targetRamp.name() + str(i+1) + 'pos'
    value = targetRamp.name() + str(i+1) + 'value'
    interp = targetRamp.name() + str(i+1) + 'interp'

    # set the keys, values and interpolations
    controller.parm(key).set(keys[i])
    controller.parm(value).set(values[i])
    controller.parm(interp).set(2)
    
    # and finally expressions
    expression = 'ch("' + path + '/' + key + '")'
    target.parm(key).setExpression(expression)
    expression = 'ch("' + path + '/' + value + '")'
    target.parm(value).setExpression(expression)
    expression = 'ch("' + path + '/' + interp + '")'
    target.parm(interp).setExpression(expression)

So this works fine as long I don't add new points to the controller node. Then ofcourse ramp creates new parameter names 'parmname15pos' etc... So the whole thing is not working properly.

This seams to be quite overengineered already... What am I missing that I have to use to do the copy / paste relative references for a ramp parameter?

[flcc]

May be you can find some clue in this asset, as it generate control point diynamically.

https://richardcthomas.com/image-to-ramp

And by the way it's a nice usefull asset.

[Librarian]

@JJ FX can you post working file.. Thank you

[JJ FX]

On 22.03.2022 at 8:24 PM, flcc said:

May be you can find some clue in this asset, as it generate control point diynamically.

https://richardcthomas.com/image-to-ramp

And by the way it's a nice usefull asset.

Thanks, will look into that

[JJ FX]

On 28.03.2022 at 9:58 AM, Librarian said:

@JJ FX can you post working file.. Thank you

Will do when I find some time!