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Synopsis

rebuildCurve [-caching boolean] [-constructionHistory boolean] [-degree int] [-endKnots int] [-fitRebuild boolean] [-keepControlPoints boolean] [-keepEndPoints boolean] [-keepRange int] [-keepTangents boolean] [-name string] [-nodeState int] [-object boolean] [-range boolean] [-rebuildType int] [-replaceOriginal boolean] [-smartSurfaceCurveRebuild boolean] [-spans int] [-tolerance linear] curve [curve]

rebuildCurve is undoable, queryable, and editable.

This command rebuilds a curve by modifying its parameterization. In some cases the shape may also change. The rebuildType (-rt) determines how the curve is to be rebuilt.

The optional second curve can be used to specify a reference parameterization.

Return value

string[]Object name and node name

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

Related

fitBspline, smoothCurve

Flags

caching, constructionHistory, degree, endKnots, fitRebuild, keepControlPoints, keepEndPoints, keepRange, keepTangents, name, nodeState, object, range, rebuildType, replaceOriginal, smartSurfaceCurveRebuild, spans, tolerance
Long name (short name) Argument types Properties
-caching(-cch) boolean createqueryedit
Toggle caching for all attributes so that no recomputation is needed
-degree(-d) int createqueryedit
The degree of the resulting curve 1 - linear, 2 - quadratic, 3 - cubic, 5 - quintic, 7 - heptic
Default: 3
-endKnots(-end) int createqueryedit
End conditions for the curve 0 - uniform end knots, 1 - multiple end knots,
Default: 0
-fitRebuild(-fr) boolean createqueryedit
If true use the least squares fit rebuild. Otherwise use the convert method.
Default: true
-keepControlPoints(-kcp) boolean createqueryedit
If true, the CVs will remain the same. This forces uniform parameterization unless rebuildType is matchKnots.
Default: false
-keepEndPoints(-kep) boolean createqueryedit
If true, keep the endpoints the same.
Default: true
-keepRange(-kr) int createqueryedit
Determine the parameterization for the resulting curve. 0 - reparameterize the resulting curve from 0 to 1, 1 - keep the original curve parameterization, 2 - reparameterize the result from 0 to number of spans
Default: 1
-keepTangents(-kt) boolean createqueryedit
If true, keep the end tangents the same.
Default: true
-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
-rebuildType(-rt) int createqueryedit
How to rebuild the input curve. 0 - uniform, 1 - reduce spans, 2 - match knots, 3 - remove multiple knots, 4 - curvature 5 - rebuild ends 6 - clean
Default: 0
-smartSurfaceCurveRebuild(-scr) boolean createqueryedit
If true, curve on surface is rebuild in 3D and 2D info is kept
Default: false
-spans(-s) int createqueryedit
The number of spans in resulting curve Used only if rebuildType is uniform.
Default: 4
-tolerance(-tol) linear createqueryedit
The tolerance with which to rebuild.
Default: 0.01
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.
-range(-rn) boolean create
Force a curve range on complete input curve.
-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 be used more than once in a command.

MEL examples

// rebuild curve to 5 uniform spans
rebuildCurve -rt 0 -s 5;

// rebuild curve by reducing redundant spans
rebuildCurve -rt 1;

// rebuild curve by matching the parameterization of another curve
// curve1 is the curve to rebuild
// curve2 is the reference curve
rebuildCurve -rt 2 curve1 curve2;

// rebuild curve by removing all multiple interior knots
rebuildCurve -rt 3;

// rebuild curve using the curvature of the curve
// to create more spans where curvature is higher
rebuildCurve -rt 4;