Hey guys quick question.

How do I use the hide or disable paramater properties under certain conditions.

I see that The Disable When and Hide When are there, but how do I use them? I wanted to use a toggle for a property, but also to disable a whole bunch of other properties when this toggle would be on, and to enable others.

here is the reference for syntax you need to use in Disable/Hide When
http://www.sidefx.com/docs/houdini13.0/ref/windows/optype#conditionals [sidefx.com]

Thank you very much

Sorry to rez, but I'd like to expand on the question. Under the “Hide When” on a property, can you put in a condition to hide a property when the digital asset's input is being used?

My digital asset has one input and if there is something plugged in to that input, I want to use the dimensions of the input's bounding box. If, however, there is nothing plugged in to the input, I want to show the user a Vector 3 for dimensions.

ConcernedCitizen
Sorry to rez, but I'd like to expand on the question. Under the “Hide When” on a property, can you put in a condition to hide a property when the digital asset's input is being used?

My digital asset has one input and if there is something plugged in to that input, I want to use the dimensions of the input's bounding box. If, however, there is nothing plugged in to the input, I want to show the user a Vector 3 for dimensions.

The way we do this in our assets is we create hidden (invisible) integer parameters (e.g. “_has_1st_input”) with a default expression that returns non-zero if the input is connected ( e.g. strcmp(opinputpath('.', 0), “”) ). Then we refer these parameters in the Disable When and/or Hide When fields (e.g. { _has_1st_input == 0 } ).

(I might remember the strcmp() results incorrectly, but the main idea is the same.) But I'm always open for better solutions

cheers

riviera
The way we do this in our assets is we create hidden (invisible) integer parameters (e.g. “_has_1st_input”) with a default expression that returns non-zero if the input is connected ( e.g. strcmp(opinputpath('.', 0), “”) ). Then we refer these parameters in the Disable When and/or Hide When fields (e.g. { _has_1st_input == 0 } ).

(I might remember the strcmp() results incorrectly, but the main idea is the same.) But I'm always open for better solutions

I'm using toggle and I'm updating it in OnCreated and OnInputChanged. Both call function from PythonModule called CheckInputs(), which updates toggle. With Python I have a little more control on what input is connected and should it update or not.

I usually use hidden parm with expression too and it works pretty well unless the expression evaluates something expensive, but for checking connected input it's perfect

the problem with python callbacks is that it will not work if you nest your asset inside another locked asset since it will not have permission to change the parm value, and you don't want to be promoting these hidden parms just to be able to set it, so just keep that in mind

tamte
the problem with python callbacks is that it will not work if you nest your asset inside another locked asset since it will not have permission to change the parm value, and you don't want to be promoting these hidden parms just to be able to set it, so just keep that in mind

o_O

You cannot also disconnect asset if it's inside another locked asset, so why bother with adding functionality like this on it? Only parent can be disconnected, so whatever you do, you have to grab parent and while you are it, why not check parameter on it?

it was just generic warning about explicitly setting parameter values on assets using python callbacks

OnInputChanged() would still be triggered if the asset is inside of locked asset and connected directly to it's indirect input (even nested multiple levels), so it can still error out

it's just something to keep in mind while designing a flexible asset that someone may decide to use within another one

Apologies for the thread necromancy…

Been trying to figure out for a while now how to disable specific field(s) within a parameter. A great example of this already working in Houdini is the Time Shift SOP. When the Clamp menu is set to “Clamp to First”, the second field of the Start/End Frame parameter is disabled; when the Clamp menu is set to “Clamp to Last”, the first field is disabled.

How is this achieved?

As far as I tested, the help docs at http://www.sidefx.com/docs/houdini13.0/ref/windows/optype#conditionals [sidefx.com] allow you to disable the entire parameter based on one or more conditions, but I haven't seen how to disable just a specific field of a parameter, because I can only specify the conditional parameter, not the affected parameter.

What am I missing here?

Unfortunately, there's currently no way to disable/enable or hide/unhide specific components of parameters outside of the HDK. Sorry! Feel free to submit an RFE for it, though.