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JohnDoe777
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Recent Forum Posts
python Toggle buttons visability June 30, 2025, 2:04 p.m.
First create a toggle parm and name it "button_toggle".
In the 2 buttons put in the "Hide When" section this
If this is a HDA:
In both button parms put this in the Callback Script(Set to Python)
Then go to the Scripts tab and add a Python Module and paste this.
If this is not a HDA or you want it to be less clean.
In both button parms put this in the Callback Script.
In the 2 buttons put in the "Hide When" section this
{ button_toggle == 0 }changing the 0 to a 1 in the second button parm. If this is a HDA:
In both button parms put this in the Callback Script(Set to Python)
hou.phm().toggle_button(kwargs)Then go to the Scripts tab and add a Python Module and paste this.
def toggle_button(kwargs): node = kwargs["node"] toggle = node.evalParm("button_toggle") node.parm("button_toggle").set(1-toggle)
If this is not a HDA or you want it to be less clean.
In both button parms put this in the Callback Script.
node = kwargs["node"]; toggle = node.evalParm("button_toggle"); node.parm("button_toggle").set(1-toggle)
python Toggle buttons visability June 29, 2025, 5:47 a.m.
You could use a hidden toggle parm in the "hide when" and then use a bit of python in the buttons callback to turn said toggle parm off and on.
Using python in parms without the constant calls? June 29, 2025, 5:39 a.m.
Hello,
When you use python in a parameter it's not only ran once when the node updates in any capacity but multiple times. This becomes even worse if you use python in a multi parm as this causes the python parm to evaluate exponentially.
I don't know if this is a long time bug or an uncontrollable aspect of how nodes evaluate. I try to avoid using Python in general in parms but sometimes it's necessary. So I was wondering if anyone knows if there's a work around to get these python parms not to run inefficiently or if this is just how it's unfortunately got to work?
Thanks
When you use python in a parameter it's not only ran once when the node updates in any capacity but multiple times. This becomes even worse if you use python in a multi parm as this causes the python parm to evaluate exponentially.
I don't know if this is a long time bug or an uncontrollable aspect of how nodes evaluate. I try to avoid using Python in general in parms but sometimes it's necessary. So I was wondering if anyone knows if there's a work around to get these python parms not to run inefficiently or if this is just how it's unfortunately got to work?
Thanks