Hi Michael,
Normaly picture is a GIF. I think Google get just first frame au GIF...
I try to store output value "outTranslate" for use it when i load my scene.
I set "outTranslate" attribute to storable and in line 116 of my script I
get attribute value for initialize one variable. I not sure this solution
is really good beacause cause an error in first compute.
# RuntimeError: maximum recursion depth exceeded in cmp //
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distanceConstraint.ma
Description: Binary data
# coding=ascii
"""
!@Brief Maya animation node.
"""
#
# Initialize Plugin
#
import math
from maya import OpenMaya, OpenMayaMPx
#
# Initialize Plugin
#
class DistanceConstraint(OpenMayaMPx.MPxNode):
"""
!@Brief Implementation of distance constraint node.
"""
kPluginNode = "distanceConstraint"
kPluginNodeID = OpenMaya.MTypeId(0x2051339)
kPluginNodeType = OpenMayaMPx.MPxNode.kDependNode
SOURCE = OpenMaya.MObject()
DISTANCE = OpenMaya.MObject()
OUT_TRANSLATE_X = OpenMaya.MObject()
OUT_TRANSLATE_Y = OpenMaya.MObject()
OUT_TRANSLATE_Z = OpenMaya.MObject()
OUT_TRANSLATE = OpenMaya.MObject()
# ==
# Node Init
# ==
@classmethod
def creator(cls):
return OpenMayaMPx.asMPxPtr(cls())
def __init__(self):
super(DistanceConstraint, self).__init__()
self._mv_last_anchor = None
self._mv_point = None
@classmethod
def initializer(cls):
a_in_attributes = list()
a_out_attributes = list()
# Input
source_attr = OpenMaya.MFnMatrixAttribute()
cls.SOURCE = source_attr.create('source', 's')
source_attr.setStorable(True)
source_attr.setKeyable(False)
a_in_attributes.append(cls.SOURCE)
distance_attr = OpenMaya.MFnNumericAttribute()
cls.DISTANCE = distance_attr.create('distance', 'd', OpenMaya.MFnNumericData.kDouble, 1.0)
distance_attr.setStorable(True)
distance_attr.setKeyable(True)
a_in_attributes.append(cls.DISTANCE)
# Output
out_translate_X_attr = OpenMaya.MFnNumericAttribute()
cls.OUT_TRANSLATE_X = out_translate_X_attr.create("outTranslateX", "otx", OpenMaya.MFnNumericData.kDouble, 0.0)
out_translate_y_attr = OpenMaya.MFnNumericAttribute()
cls.OUT_TRANSLATE_Y = out_translate_y_attr.create("outTranslateY", "oty", OpenMaya.MFnNumericData.kDouble, 0.0)
out_translate_z_attr = OpenMaya.MFnNumericAttribute()
cls.OUT_TRANSLATE_Z = out_translate_z_attr.create("outTranslateZ", "otz", OpenMaya.MFnNumericData.kDouble, 0.0)
out_translate_attr = OpenMaya.MFnNumericAttribute()
cls.OUT_TRANSLATE = out_translate_attr.create("outTranslate", "ot", cls.OUT_TRANSLATE_X, cls.OUT_TRANSLATE_Y, cls.OUT_TRANSLATE_Z)
out_translate_attr.setKeyable(False)
out_translate_attr.setStorable(True)
a_out_attributes.append(cls.OUT_TRANSLATE)
# Add attribute
for mo_attribute in (a_in_attributes + a_out_attributes):
cls.addAttribute(mo_attribute)
# Attribute dependencies
for mo_out_attribute in a_out_attributes:
for mo_in_attribute in a_in_attributes:
cls.attributeAffects(mo_in_attribute, mo_out_attribute)
# ==
# Compute
# ==
def compute(self, plug, data):
# Set valid plugs
a_valid_output = [self.OUT_TRANSLATE_X, self.OUT_TRANSLATE_Y, self.OUT_TRANSLATE_Z, self.OUT_TRANSLATE]
if plug in a_valid_output:
# Get Data
mm_source = data.inputValue(self.SOURCE).asMatrix()
f_distance = data.inputValue(self.DISTANCE).asDouble()
mtr_source = OpenMaya.MTransformationMatrix(mm_source)
mv_anchor = mtr_source.getTranslation(OpenMaya.MSpace.kWorld)
# Compute only if current anchor is different of last anchor
if self._mv_last_anchor is not None and mv_anchor == self._mv_last_anchor:
return
# Get output point
if self._mv_point is None:
