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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