This is not exactly what your asking for but it is along those lines.
This is an example of how to iterate over the selected meshes. This is
outside the context of my plug which I could show also but from the
looks there you have most of what you need and something like this
might work.
# Get the selection and create a selection list of all the nodes
meshes
selection = OpenMaya.MSelectionList()
OpenMaya.MGlobal.getActiveSelectionList( selection );
# Create an itorator to iterate over the selection
# Use the MFn class to as a filter to filter geometry types
iter = OpenMaya.MItSelectionList ( selection,
OpenMaya.MFn.kGeometric );
# Iterate over selected geometry nodes
while not iter.isDone():
#Define local vars
MObject iterMesh;
MFnMesh selectMesh;
MString name;
MDagPath dagpath;
#Get the mesh from iter
iter.getDependNode( iterMesh );
#Debuging and displaying info
selectMesh.setObject( iterMesh );
name = selectMesh.name();
MGlobal::displayInfo( "retreiving mesh named : " + name );
#Get the dag path of the geometry node
iter.getDagPath( dagpath );
iter.next()
On Feb 12, 8:44 am, "[email protected]"
<[email protected]> wrote:
> Hey, i ve been writing a bullet collsion tool and have completed the
> first part of the technical part. basically the function is to fire a
> ray and detect the first intersection with a mesh. a big thanks to all
> the people who post here cuz without your help i would nt of been able
> to begin to understand what the hell any of this means! the code is
> good and with 2 locators as ray start and direction it detects
> intersection the name of the face intersected and the normals of the
> face.
>
> The next stage is to build in an itterator that will cycle through all
> the meshs in a scene? any suggestions ? at the moment it just looks
> for pcube1
>
> import maya.cmds as mc
> import maya.OpenMaya as om
>
> ## create 2 locators named start and finish to angle the ray points
>
> startWP = mc.xform('start',q=1,rp=1,ws=1)
> FinishWP = mc.xform('Finish',q=1,rp=1,ws=1)
>
> vectBtwPnts= ((startWP [0] -FinishWP [0])*-1), ((startWP [1] -
> FinishWP [1])*-1), ((startWP [2] -FinishWP [2])*-1)
> vectorToFinish = om.MFloatVector(vectBtwPnts[0],vectBtwPnts
> [1],vectBtwPnts[2])
>
> def nameToNode(name ):
> selectionList = om.MSelectionList()
> selectionList.add( name )
> node = om.MObject()
> selectionList.getDependNode( 0, node )
> return node
>
> #retireves the right DAG node for selected objects
>
> def nameToDag( name ):
> selectionList = om.MSelectionList()
> selectionList.add( name )
> node = om.MDagPath()
> selectionList.getDagPath( 0, node )
> return node
>
> ## this is where the itterator is needed ? ?
>
> dag = nameToDag(" pCube1 " )
>
> meshFn = om.MFnMesh()
> meshFn.setObject( dag )
>
> raySource = om.MFloatPoint(startWP[0],startWP[1],startWP[2])
> rayDirection = vectorToFinish
> rayDirection = rayDirection.normal()
>
> hitFacePtr = om.MScriptUtil().asIntPtr()
> hitPoint = om.MFloatPoint()
>
> idsSorted = False
> testBothDirections = False
> faceIds = None
> triIds = None
> accelParams = None
> hitRayParam = None
> hitTriangle = None
> hitBary1 = None
> hitBary2 = None
>
> maxParamPtr = 99999999
> worldSpace = om.MSpace.kWorld
>
> hit = meshFn.closestIntersection(raySource,
> rayDirection,
> faceIds,
> triIds,
> idsSorted,
> worldSpace,
> maxParamPtr,
> testBothDirections,
> accelParams,
> hitPoint,
> hitRayParam,
> hitFacePtr,
> hitTriangle,
> hitBary1,
> hitBary2)
>
> if hit:
> hitFace = om.MScriptUtil ( hitFacePtr ).asInt()
>
> faceNumber = hitFace
> vector = om.MVector()
> NormalFn = om.MFnMesh(dag)
> NormalFn.getPolygonNormal(faceNumber, vector, worldSpace)
> hitFace = om.MScriptUtil ( hitFacePtr ).asInt()
> print "The hit point in X is %f " %hitPoint[0]
> print "The hit point in Y is %f " %hitPoint[1]
> print "The hit point in Z is %f " %hitPoint[2]
> print "The number of the face hit is %d" %hitFace
>
> print "The normal of the hit face is %f in x" %vector.x
> print "The normal of the hit face is %f in y" %vector.y
> print "The normal of the hit face is %f in z" %vector.z
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Yours,
Maya-Python Club Team.
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