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Synopsis

hardenPointCurve( curve , [caching=boolean], [constructionHistory=boolean], [multiplicity=int], [name=string], [nodeState=int], [object=boolean], [replaceOriginal=boolean])

Note: Strings representing object names and arguments must be separated by commas. This is not depicted in the synopsis.

hardenPointCurve is undoable, queryable, and editable.

The hardenPointCurve command changes the knots of a curve given a list of control point indices so that the knot corresponding to that control point gets the specified multiplicity. Multiplicity of -1 is the universal value used for multiplicity equal to the degree of the curve.

limitations
The CV whose multiplicity is being raised needs to have its neighbouring CVs of multiplicity 1. How many neighbours depends on the degree of the curve and the difference in CV multiplicities before and after this operation. For example, if you're changing a CV of multiplicity 1 into a CV of multiplicity 3, you will need the 4 neighbouring CVs (2 on each side) to be of multiplicity 1. The CVs that do not satisfy that requirement will be ignored.

Return value

string[]Object name and node name

In query mode, return type is based on queried flag.

Flags

caching, constructionHistory, multiplicity, name, nodeState, object, replaceOriginal
Long name (short name) Argument types Properties
caching(cch) boolean createqueryedit
Toggle caching for all attributes so that no recomputation is needed
multiplicity(m) int createqueryedit
the required multiplicity of the curve knot
Default: -1
nodeState(nds) int createqueryedit

Maya dependency nodes have 6 possible states. The Normal (0), HasNoEffect (1), and Blocking (2) states can be used to alter how the graph is evaluated.

The Waiting-Normal (3), Waiting-HasNoEffect (4), Waiting-Blocking (5) are for internal use only. They temporarily shut off parts of the graph during interaction (e.g., manipulation). The understanding is that once the operation is done, the state will be reset appropriately, e.g. Waiting-Blocking will reset back to Blocking.

The Normal and Blocking cases apply to all nodes, while HasNoEffect is node specific; many nodes do not support this option. Plug-ins store state in the MPxNode::state attribute. Anyone can set it or check this attribute. Additional details about each of these 3 states follow.

State Description
Normal The normal node state. This is the default.
HasNoEffect

The HasNoEffect option (a.k.a. pass-through), is used in cases where there is an operation on an input producing an output of the same data type. Nearly all deformers support this state, as do a few other nodes. As stated earlier, it is not supported by all nodes.

It’s typical to implement support for the HasNoEffect state in the node’s compute method and to perform appropriate operations. Plug-ins can also support HasNoEffect.

The usual implementation of this state is to copy the input directly to the matching output without applying the algorithm in the node. For deformers, applying this state leaves the input geometry undeformed on the output.

Blocking

This is implemented in the depend node base class and applies to all nodes. Blocking is applied during the evaluation phase to connections. An evaluation request to a blocked connection will return as failures, causing the destination plug to retain its current value. Dirty propagation is indirectly affected by this state since blocked connections are never cleaned.

When a node is set to Blocking the behavior is supposed to be the same as if all outgoing connections were broken. As long as nobody requests evaluation of the blocked node directly it won’t evaluate after that. Note that a blocked node will still respond to getAttr requests but a getAttr on a downstream node will not reevaluate the blocked node.

Setting the root transform of a hierarchy to Blocking won’t automatically influence child transforms in the hierarchy. To do this, you’d need to explicitly set all child nodes to the Blocking state.

For example, to set all child transforms to Blocking, you could use the following script.


import maya.cmds as cmds
def blockTree(root):
nodesToBlock = []
for node in {child:1 for child in cmds.listRelatives( root, path=True, allDescendents=True )}.keys():
nodesToBlock += cmds.listConnections(node, source=True, destination=True )
for node in {source:1 for source in nodesToBlock}.keys():
cmds.setAttr( '%s.nodeState' % node, 2 )

Applying this script would continue to draw objects but things would not be animated.


Default: kdnNormal
Common flags
constructionHistory(ch) boolean create
Turn the construction history on or off.
name(n) string create
Sets the name of the newly-created node. If it contains namespace path, the new node will be created under the specified namespace; if the namespace does not exist, it will be created.
object(o) boolean create
Create the result, or just the dependency node.
replaceOriginal(rpo) boolean create
Create "in place" (i.e., replace).

Flag can appear in Create mode of command Flag can appear in Edit mode of command
Flag can appear in Query mode of command Flag can have multiple arguments, passed either as a tuple or a list.

Python examples

import maya.cmds as cmds

# Make the example curve.
cmds.curve( d=3, p=((-7.253894, 0, 10.835724), (-7.423939, 0, 6.977646), (-7.400778, 0, 2.798971), (-7.458196, 0, -1.524959), (-2.411453, 0, -1.07677), (1.44791, 0, -0.8977448), (5.526346, 0, -0.8610371), (5.740407, 0, 3.780402), (6.293634, 0, 7.571941), (5.957847, 0, 10.72273), (2.753946, 0, 10.894312), (-0.6375988, 0, 11.062571), (-5.889847, 0, 10.940658)), k=(0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 10, 10) )

# Raise the ones that you want to have "sharp" corners
cmds.hardenPointCurve( 'curve1.cv[3]', 'curve1.cv[6]', 'curve1.cv[9]', ch=True, rpo=True, m=-1 )

# Same result, as the in-between CVs are ignored:
cmds.undo()
cmds.hardenPointCurve( 'curve1.cv[0:12]', ch=1, rpo=1, m=-1 )