The parent id points to the id of the parent parm of this parm. The parent parm is something like a folder.

Parameter id of the parent of this parameter.

Child index within its immediate parent parameter.

The HAPI type of the parm

The Houdini script-type of the parm

Some parameter types require additional type information.

• File path parameters will indicate what file extensions they expect in a space-separated list of wild-cards. This is set in the Operator Type Properties using the File Pattern parameter property. For example, for filtering by PNG and JPG only: “.png .jpg”

For the majority of parameter types permission will not be applicable. For file path parameters these permissions will indicate how the asset plans to use the file: whether it will only read it, only write to it, or both. This is set in the Operator Type Properties using the Browse Mode parameter property.

Number of tags on this parameter.

Tuple size. For scalar parameters this value is 1, but for vector parameters this value can be greater. For example, a 3 vector would have a size of 3. For folders and folder lists, this value is the number of children they own.

Any hapi.parmType can be a choice list. If this is set to hapi.choiceListType._None than this parameter is NOT a choice list. Otherwise, the parameter is a choice list of the indicated type. See hapi.getParmChoiceLists.

Any hapi.parmType can be a choice list. If the parameter is a choice list, this tells you how many choices it currently has. Note that some menu parameters can have a dynamic number of choices so it is important that this count is re-checked after every cook. See hapi.getParmChoiceLists.

Note that folders are not real parameters in Houdini so they do not have names. The folder names given here are generated from the name of the folderlist (or switcher) parameter which is a parameter. The folderlist parameter simply defines how many of the “next” parameters belong to the first folder, how many of the parameters after that belong to the next folder, and so on. This means that folder names can change just by reordering the folders around so don’t rely on them too much. The only guarantee here is that the folder names will be unique among all other parameter names.

The label string for the parameter

If this parameter is a multiparm instance than the hapi.ParmInfo.templateNameSH will be the hash-templated parm name, containing #'s for the parts of the name that use the instance number. Compared to the hapi.ParmInfo.nameSH the hapi.ParmInfo.nameSH will be the hapi.ParmInfo.templateNameSH but with the #'s replaced by the instance number. For regular parms, the hapi.ParmInfo.templateNameSH is identical to the hapi.ParmInfo.nameSH.

The help string for this parameter

Whether min/max exists for the parameter values.

Whether min/max exists for the parameter values.

Whether min/max exists for the parameter values.

Whether min/max exists for the parameter values.

Parameter value range, shared between int and float parameters.

Parameter value range, shared between int and float parameters.

Parameter value range, shared between int and float parameters.

Parameter value range, shared between int and float parameters.

Whether this parm should be hidden from the user entirely. This is mostly used to expose parameters as asset meta-data but not allow the user to directly modify them.

Whether this parm should appear enabled or disabled.

If true, it means this parameter doesn’t actually exist on the node in Houdini but was added by Houdini Engine as a spare parameter. This is just for your information. The behaviour of this parameter is not any different than a non-spare parameter.

Whether this parm should be on the same line as

Whether the label should be displayed.

The index to use to look into the values array in order to retrieve the actual value(s) of this parameter.

The index to use to look into the values array in order to retrieve the actual value(s) of this parameter.

The index to use to look into the values array in order to retrieve the actual value(s) of this parameter.

The index to use to look into the values array in order to retrieve the actual value(s) of this parameter.

If this is a hapi.parmType.Node this tells you what node types this parameter accepts.

The node input parameter could have another subtype filter specified, like “Object: Geometry Only”. In this case, this value will specify that extra filter. If the filter demands a node that HAPI does not support, both this and hapi.ParmInfo.inputNodeType will be set to NONE as such a node is not settable through HAPI.

See hapi.insertMultiparmInstance.

The index of the instance in the multiparm.

The number of parms in a multiparm instance.

The number of instances in a multiparm.

First instance’s hapi.ParmInfo.instanceNum. Either 0 or 1.

Provides the raw condition string which is used to evaluate the the visibility of a parm

Provides the raw condition string which is used to evalute whether a parm is enabled or disabled

Whether or not the “Use Menu Item Token As Value” checkbox was checked in a integer menu item.