MFnMesh.getClosestIntersection method is causing problem

[Anonymous]

Hello Everyone,
I'm quite new to Maya API programming. Recently I was trying to develop a plugin which uses ray projection, I've used MFnMesh.getClosestIntersection method to do so. But it's causing some problem which I'm unable to figure out. This plugin works on my laptop but on every other computer, whenever the plugin goes into Compute method, Maya crashes. I'm attaching the code with this post. If anyone could help me figure out what the problem is then would be really great.

''' Author - Pranay Meher
 Date - 26-8-2012
 This script emulates the wheel collission on a ground plane
'''

import maya.OpenMaya as OpenMaya
import maya.OpenMayaMPx as OpenMayaMPx
import sys

kPluginNodeTypeName = 'project'

kPluginNodeId = OpenMaya.MTypeId( 0x800010 )

# Class implementaion
class projectNode( OpenMayaMPx.MPxNode ):
 
 inputMeshsrc=OpenMaya.MObject()
 iteration = OpenMaya.MObject()
 inputPoint = OpenMaya.MObject()
 output = OpenMaya.MObject()
 radius = OpenMaya.MObject()
 
 
 def __init__( self ):
 OpenMayaMPx.MPxNode.__init__( self )
 
 def compute( self, plug, data ):
 
 if plug == self.output:
 print 'In Calculation'
 
 # get the inputMeshSrc and in point data handle
 inMeshSrcHandle = data.inputValue( self.inputMeshSrc )
 inPointHandle = data.inputValue( self.inputPoint )
 
 meshsrc=inMeshSrcHandle.asMesh()
 mFnMeshSource = OpenMaya.MFnMesh( meshSrc )
 
 inRadiusHandle = data.inputValue( self.radius )
 inRadius = inRadiusHandle.asFloat()
 
 inPoint = inPointHandle.asFloat3()
 
 groundPoint = self.rayProject( mFnMeshSource, inPoint )
 
 outHandle = data.outputValue( self.output )
 outHandle.set3Float( groundPoint.x, groundPoint.y, groundPoint.z )
 
 print 'Throwing Ground Point'
 
 data.setClean( plug )
 
 else:
 return OpenMaya.MStatus.kUnknownParameter
 
 @classmethod
 def nodeCreator( cls ):
 return OpenMayaMPx.asMPxPtr( cls() )
 
 def rayProject( self, mFnMeshSource, pointSource ):
 # This attribute will store the intersection Point in worldspace
 hitPoint = OpenMaya.MFloatPoint()
 
 #Setting up attributes required by MFn mesh to calculate intersection
 rayDirection = OpenMaya.MFloatVector( 0, -1, 0 )
 raySource = OpenMaya.MFloatPoint( pointSource, pointSource, pointSource )
 
 hitFacePtr = OpenMaya.MScriptUtil().asIntPtr()
 idsSorted = False
 testBothDirections = True
 faceIds = None
 triIds = None
 accelParams = None
 hitRayParam = None
 hitTriangle = None
 hitBary1 = None
 hitBary2 = None
 maxParamPtr = 99999999
 tolerance = 0.1
 
 hit = mFnMeshSource.closestIntersection(raySource,
 rayDirection,
 faceIds,
 triIds,
 idsSorted,
 OpenMaya.MSpace.kWorld,
 maxParamPtr,
 testBothDirections,
 accelParams,
 hitPoint,
 hitRayParam,
 hitFacePtr,
 hitTriangle,
 hitBary1,
 hitBary2)
 
 if hit:
 outTemp = OpenMaya.MPoint( hitPoint.x, hitPoint.y, hitPoint.z )
 
 hitMPoint = OpenMaya.MPoint( hitPoint.x, hitPoint.y, hitPoint.z )
 
 return hitMPoint
 
 @classmethod
 def nodeInitializer( cls ):
 fnTypedAttr = OpenMaya.MFnTypedAttribute()
 fnNumericAttr = OpenMaya.MFnNumericAttribute()
 
 # Setting up the input Mesh attribute
 cls.inputMeshsrc=fnTypedAttr.create( 'InputMeshSrc', 'inMeshSrc', OpenMaya.MFnData.kMesh )
 fnTypedAttr.setReadable( True )
 fnTypedAttr.setHidden( True )
 
 cls.radius = fnNumericAttr.create( 'Radius', 'rds', OpenMaya.MFnNumericData.kFloat )
 
 # Setting the trasformation point attributes
 cls.inputPoint = fnNumericAttr.createPoint( 'inputPoint', 'inPoint' )
 fnNumericAttr.setConnectable( True )
 
 
 # Setting up output compound attribute
 cls.output = fnNumericAttr.createPoint( 'output', 'out' )
 fnNumericAttr.setWritable( False )
 fnNumericAttr.setStorable( False )
 
 
 cls.addAttribute( cls.inputMeshSrc )
 cls.addAttribute( cls.radius )
 cls.addAttribute( cls.inputPoint )
 cls.addAttribute( cls.output )
 
 cls.attributeAffects( cls.inputPoint, cls.output )
 cls.attributeAffects( cls.inputMeshSrc, cls.output )
 cls.attributeAffects( cls.radius, cls.output )

def initializePlugin( mobject ):
 mplugin = OpenMayaMPx.MFnPlugin( mobject )
 
 try:
 mplugin.registerNode( kPluginNodeTypeName, kPluginNodeId, projectNode.nodeCreator, projectNode.nodeInitializer )
 except:
 sys.stderr.write( 'Could not register plugin - %s\n' % kPluginNodeTypeName )
 raise

def uninitializePlugin( mobject ):
 mplugin = OpenMayaMPx.MFnPlugin( mobject )
 
 try:
 mplugin.deregisterNode( kPluginNodeId )
 except:
 sys.stderr.write('Could not unregister plugin - %s\n' % kPluginNodeTypeName )

The plugin requires a scene with polyPlane, polySphere and a locator. Then connect the attribute as below.
polyPlane.worldMesh -> project1.inputMeshSrc
locator1.translate -> project1.inputPoint
project1.output -> pSphere1.translate

Please also note that I'm testing this code on Maya 2012. The indentations are not displayed correctly on this page but my code has proper indentations.

projectionnode.zip

[Anonymous]

Since code is not displayed with proper indentations, I can mail the plugin code whoever is willing to help me. Thanks in advance. Please send me a mail on pranaymeher@gmail.com

[Steve_Curley]

If you don't mind it being made publically available attach it to the above post - must be zipped or it won't attach. See this post for help with attachments.

[Anonymous]

Thanks Steve,
I've attached the test scene and plugin code to my post.