Use hou.SopNodeType.addSelector() to create a selector and add it to a SOP node type. When the user creates a new instance of a node type in the viewer, Houdini will invoke all of its selectors sequentially. Each selector prompts the user to select geometry. When all selectors have been invoked, Houdini creates the new node and each selector connects its input nodes and fills in any group parameters on the node to match what was selected.
Return the node type that this selector is attached to.
Remove this selector from its node type.
See also hou.SopNodeType.addSelector().
Return the name of this selector. The name is unique within the node type it is attached to.
Return the name of the type of selector to use. Different selectors have different behaviors. For example “prims” will select only primitives and is used, for example, by the cookie SOP. “points” will select only points, and is used by SOPs like the point SOP. “everything” will select any geometry, and is used for SOPs like “xform” and “blast”.
See hou.SopNodeType.selectors() for example code that returns all the available selector types.
A string to display at the bottom of the viewer to instruct the user what to select.
of hou.primType enum values
Return a sequence of hou.primType enumeration values to specify what primitive types are allowed.
Note that if you pass an empty sequence for the
in hou.SopNodeType.addSelector() and then call this method on
the newly-created selector, this method will return a tuple of all
Return the name of the SOP node parameter containing the group field. The selector will set this parameter to the string representing the points, primitives, edges, etc. chosen by the user in the viewer. It is typically named “group”.
Return the name of the SOP node parameter containing the menu of geometry types. If the selector can select multiple geometry types (e.g. points or primitives), it will set this parameter to match the type of geometry the user chose. The transform SOP, for example, has a Group Type parameter that tells it how to interpret the string in the Group parameter. For such selectors, the parameter is typically named “grouptype”. For selectors that do not allow multiple geometry types, this parameter is usually “”.
Return the index of the input connector on the SOP node where the selector should wire input SOPs. A cookie SOP, for example, has two input connectors and one selector for each input connector.
Return whether or not this input is required or optional. If the user does not select any geometry and the input is not required, the selector will not connect anything to its input connector.
Return whether the user is allowed to select the geometry and begin manipulating the handles with a single mouse click. A transform SOP, for example, lets you select the geometry and drag it right away. Dragging the geometry forces the selector to finish immediately, the selector connects the input and sets the group parameter, and subsequent mouse movements are passed to the handle which translates the geometry by changing parameter values.
Return whether or not use an empty string in the group parameter if the
user selects all the geometry. If False, Houdini will place an asterisk
*) in the group parameter when the user selects all the geometry. Most
SOPs use an empty string.
Returns an optional extra info string that contains additional settings.
of hou.geometryType enum values
Return a tuple of hou.geometryType enumeration values. This tuple describes which geometry entities (e.g. points, primitives, edges, etc.) the selector allows. Note that this list is a property of the selector type and you cannot specify it when creating a new selector. Instead, you must choose a selector type with the desired geometry types.
See hou.SopNodeType.selectors() for a function that returns a list of all the selector types. The following function will return the geometry types for a particular selector type.
def geometryTypesForSelectorType(selector_type): '''Given a selector type name, return the tuple of geometry types it will select.''' # First find a node type that uses this selector. for node_type in hou.sopNodeTypeCategory().nodeTypes().values(): # Skip manager nodes, like shopnets, ropnets, etc. if not isinstance(node_type, hou.SopNodeType): continue for selector in node_type.selectors(): if selector_type == selector.selectorType(): return selector.geometryTypes() # The selector type name is invalid. raise hou.OperationFailed("Invalid selector type")
Return a tuple of indices mapping geometry types to indices on the geometry type parameter menu.
Whether or not a selector is ordered is a property of the selector type, and you cannot specify it when creating a new selector. Instead, you must choose the appropriate selector type. For example, the “everything” selector can select primitives, primitive groups, points, point groups, edges, and breakpoints. It sets a group type menu parameter to match the type of selection, and this menu must have the entries “Guess from Group”, “Breakpoints”, “Edges”, “Points”, and “Primitives”. For an “everything” selector, this method returns (4, 4, 3, 3, 2, 1), mapping the geometry element types to 0-based entries in the menu. For example, if the user selects edges, the selector will look up the fifth element (2) and set the menu parameter to the item at index 2 (“Edges”).
The length of the tuple of ints is the same as
If this selector is not intended to work with a menu parameter, each
value in the tuple will be -1.
See also hou.Selector.geometryTypes().
Return whether or not this selector preserves the order in which the user selected the geometry.
For example, the selector is for points and the user clicks on points 1, 0,
and 2, in that order, an ordered selector will set the SOP’s group parameter
"1 0 2", while an unordered selector will set it to
SOPs where the order of the group selector matters, use ordered selectors.
Whether or not a selector is ordered is a property of the selector type, and you cannot specify it when creating a new selector. Instead, you must choose the appropriate selector type. For example, “prims” is an unordered selector type, but “ordered_prims” is ordered. See hou.Selector.geometryTypes() for a function that can be adapted to determine if a selector is ordered, and see hou.SopNodeType.selectors() for a function to list all the selector types.