Hi All,
In the attached example I have a simple HDA with two parameters, what I need is for the second param to have a maximum range dependent on the value of the first param (max range limited to half the value of the first param).
Although it's possible to inject HScript snippets in the Channels tab of the Operator Type Property window, it's apparently not possible to do the same in the range input.
Any ideas on how to achieve this?
Thanks
Limit the Range of HDA Parameter
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- netlander
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- SciTheSqrl
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the range option is purely for cosmetic purpose, it only affect how the interface will display the parameter and wouldn't prevent the user from adding value above the defined range and you can't setup a dynamic behavior for it.
one way I see you could 'enforce' a real range is using the hda's python module script that would automatically update the value of the Bevel parameter when the value of the size and/or bevel parameter change (using the callback script).
for exemple (not tested) :
you could also make it a bit more dynamic by giving the 2 parameter you'd wish to enforce and reuse the function in the callback parameter :
callback :
second way is to use a clamp hscript function on whichever node you're using inside the hda to ensure the limit is always enforced no matter what.
I wouldn't recommend trying to cheat by updating the UI of the hda using python.
one way I see you could 'enforce' a real range is using the hda's python module script that would automatically update the value of the Bevel parameter when the value of the size and/or bevel parameter change (using the callback script).
for exemple (not tested) :
def enforceRange(kwargs):
node = kwargs["node"]
sizeValue = node.evalParm("Size")
bevelValue = node.evalParm("Bevel")
if bevelValue > sizeValue:
node.parm("Bevel").set(sizeValue)
you could also make it a bit more dynamic by giving the 2 parameter you'd wish to enforce and reuse the function in the callback parameter :
def enforceRange(kwargs, rangeParm, parm):
node = kwargs["node"]
range = node.evalParm(rangeParm)
value= node.evalParm(parm)
if value> range :
node.parm(parm).set(range )
callback :
hou.phm().enforceRange(kwargs, "Size", "Bevel")
second way is to use a clamp hscript function on whichever node you're using inside the hda to ensure the limit is always enforced no matter what.
I wouldn't recommend trying to cheat by updating the UI of the hda using python.
Edited by SciTheSqrl - June 19, 2023 08:15:34
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- netlander
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Thanks for the answer which is somewhat more involved than I hoped and will likely look into it at some point as I need to embrace this aspect of Houdini scripting.
There is the padlock icon next to the range boudaries to prevent the end-user from going outside of the range.
SciTheSqrl
the range option is purely for cosmetic purpose, it only affect how the interface will display the parameter and wouldn't prevent the user from adding value above the defined range...
There is the padlock icon next to the range boudaries to prevent the end-user from going outside of the range.
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- oniregoc
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Hello,
I tryed to dynamicly "enforce" max range value of a switch with the number of switch input like this :
def enforceRange(kwargs):
node = kwargs
inputvalue = opninputs(',')-1
node.parm("Range").set(0,inputvalue)
but of course it doesn't work because the range need two values (min and max)...how do I set the max value ? any ideas ?
By the way got the error : Traceback (most recent call last): File "Sop/Test::1.0/ModByC", line 1, in <module>
TypeError: enforceRange() takes 1 positional argument but 2 were given
I tryed to dynamicly "enforce" max range value of a switch with the number of switch input like this :
def enforceRange(kwargs):
node = kwargs
inputvalue = opninputs(',')-1
node.parm("Range").set(0,inputvalue)
but of course it doesn't work because the range need two values (min and max)...how do I set the max value ? any ideas ?
By the way got the error : Traceback (most recent call last): File "Sop/Test::1.0/ModByC", line 1, in <module>
TypeError: enforceRange() takes 1 positional argument but 2 were given
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