pymel.core.modeling.projectTangent¶

projectTangent(*args, **kwargs)¶

The project tangent command is used to align (for tangents) a curve to two other curves or a surface. A surface isoparm may be selected to define the direction (U or V) to align to. The end of the curve must intersect with these other objects. Curvature continuity may also be applied if required. Tangent continuity means the end of the curve is modified to be tangent at the point it meets the other objects. Curvature continuity means the end of the curve is modified to be curvature continuous as well as tangent. If the normal tangent direction is used, the curvature continuity and rotation do not apply. Also, curvature continuity is only available if align to a surface (not with 2 curves).

Flags:

Long Name / Short Name		Argument Types	Properties
caching / cch		bool
	Toggle caching for all attributes so that no recomputation is needed
constructionHistory / ch		bool
	Turn the construction history on or off.
curvature / c		bool
	Curvature continuity is on if true and off otherwise. Default:false
curvatureScale / cs		float
	Curvature scale applied to curvature of curve to align. Available if curvature option is true. Default:0.0
frozen / fzn		bool
ignoreEdges / ie		bool
	If false, use the tangents of the trim edge curves if the surface is trimmed. If true, use the tangents of the underlying surface in the U/V directions. Default:false
name / n		unicode
	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.
nodeState / nds		int
	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-Blockingwill reset back to Blocking. The Normaland Blockingcases apply to all nodes, while HasNoEffectis node specific; many nodes do not support this option. Plug-ins store state in the MPxNode::stateattribute. Anyone can set it or check this attribute. Additional details about each of these 3 states follow. StateDescriptionNormalThe normal node state. This is the default.HasNoEffectThe HasNoEffectoption (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. Its typical to implement support for the HasNoEffectstate in the nodes 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. BlockingThis is implemented in the depend node base class and applies to all nodes. Blockingis 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 Blockingthe 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 wont evaluate after that. Note that a blocked node will still respond to getAttrrequests but a getAttron a downstream node will not reevaluate the blocked node. Setting the root transform of a hierarchy to Blockingwont automatically influence child transforms in the hierarchy. To do this, youd need to explicitly set all child nodes to the Blockingstate. 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
object / o		bool
	Create the result, or just the dependency node.
replaceOriginal / rpo		bool
	Create in place(i.e., replace). Flag can have multiple arguments, passed either as a tuple or a list.
reverseTangent / rt		bool
	Reverse the tangent direction if true and leave it the way it is if false. Default:false
rotate / ro		float
	Amount by which the tangent of the curve to align will be rotated. Available only if the normal direction (3) is not used for tangentDirection. Default:0.0
tangentDirection / td		int
	Tangent align direction type legal values: 1=u direction (of surface or use first curve), 2=v direction (of surface or use second curve), 3=normal direction (at point of intersection). Default:1
tangentScale / ts		float
	Tangent scale applied to tangent of curve to align. Default:1.0 Common flags

Derived from mel command maya.cmds.projectTangent

Example:

import pymel.core as pm

# Do project tangent with curvature continuity between a curve and a
# nurbs plane surface
pm.projectTangent( 'curve1', 'nurbsPlane1', c=True )

# Do project tangent between the 3 curves and tangent align the curve
# with the reverse tangent of the second of the other 2 curves
# (i.e. with curve3)
pm.projectTangent( 'curve1', 'curve2', 'curve3', td=2, rt=True )