Is it possible to assign a parameter to another in Python at once?

[magneto]

Hi,

I have a matrix4 parameter with 16 float fields. I can assign references to them one by one, but is it possible to do it at once. So like:

matrixParm.set(anotherMatrixParm)

[/CODE]

instead of:

[CODE]
m1.set(mm1)
m2.set(mm2)
m3.set(mm3)
[/CODE]

etc

When I do this, it can't find my matrix parameter called "m" in the attribcreate1.

[CODE]hou.node('/obj/geo1/attribcreate1').parm('m')[/CODE]

It works if I use "m1", "m2" for individual fields, but I want to assign the whole parameter like above.

Is this possible?

Thanks

[graham]

A parameters as a whole is generally referred to as a parameter tuple. This is basically a collection of the sub parms. Take the Translate parm on an object for example.

>>> pt=hou.parmTuple('/obj/geo1/t')
>>> for parm in pt:
...	 parm
...
<hou.Parm tx in /obj/geo1>
<hou.Parm ty in /obj/geo1>
<hou.Parm tz in /obj/geo1>

This is the reason you cannot find just 'm'. hou.Node.parmTuple('m') should return the parm tuple named after 'm': m1, m2, ....

That being said, hou.Parm objects support setting to other hou.Parm objects (hou.Parm.set(hou.Parm)) and automatically generating the corresponding channel references. Unfortunately hou.ParmTuples don't (existing RFE).

Luckily hou.ParmTuple objects are iterable with the hou.Parm objects contained in them. You can do something like this:

def setParmTupleToParmTuple(m, mm):
    for m_parm, mm_parm in zip(m, mm):
  	  m_parm.set(mm_parm)

[magneto]

Thanks Graham, exactly what I needed

So in essence hou.Parm is for channels but hou.ParmTuple is for a parameter as a whole, right?

Btw I noticed you become staff, congrats