Re: [Maya-Python] MMeshIntersector: Getting world position / matrix of point in object space

[Cedric Bazillou]

tips wise maybe just put your code into a function so the garbage collector 
can clean up intermediate elements?

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Re: [Maya-Python] MMeshIntersector: Getting world position / matrix of point in object space

[igo rov]

...yes thats true, and I wasnt`t expecting that there could be a bug in the
API :)  Deciding for api 1.0 or 2.0 ist not too easy.
I know the courses of cgcircuit, but for python. Hopefully taking the next
step to c++ won`t bee too hard for somebody coming more from the artist
side of maya. Though I will stick with python also, and defintely come back
here soon.

2018-08-04 18:08 GMT+02:00 Luiz Amaral :

> Hey igo, happy to see you solved the puzzle! Its such a great feeling to
> have our tools working. Specially after some struggle ;)
>
> Maya API can be tricky sometimes.
>
> I highly recomend Chad Vernon’s courses on cgcircuit for learning c++ API
>
> https://www.cgcircuit.com/
>
>  http://www.chadvernon.com/blog/resources/maya-api-programming/
>
> Good luck and enjoy the ride :D
>
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Re: [Maya-Python] MMeshIntersector: Getting world position / matrix of point in object space

[Luiz Amaral]

Hey igo, happy to see you solved the puzzle! Its such a great feeling to have 
our tools working. Specially after some struggle ;)

Maya API can be tricky sometimes.

I highly recomend Chad Vernon’s courses on cgcircuit for learning c++ API 

https://www.cgcircuit.com/

 http://www.chadvernon.com/blog/resources/maya-api-programming/

Good luck and enjoy the ride :D

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Re: [Maya-Python] MMeshIntersector: Getting world position / matrix of point in object space

[igo rov]

Hi again,

I don`t know how much sense this code still makes, however for me its for 
learning purposes and for me its one step towards my goal to learn c++ api. 
Especially converting between vectors, MFloatPoint and Matrix type might be 
horrible code...but I didn*t find a more direct way.at least it works 
for me.
If you have some hints for me, how to do things more clever, please don`t 
hesitate

import maya.OpenMaya as om

selList = om.MSelectionList()
selList.add("pCube1")
dagCube = om.MDagPath()
selList.getDagPath(0, dagCube)
mesh = dagCube.child(0)
trFn = om.MFnTransform(dagCube)
matrCube = trFn.transformationMatrix()
##
mesh.apiTypeStr() # should be kMesh
##
intersector = om.MMeshIntersector()
intersector.create(mesh, matrCube) # no error in API 1.0...Yeah ;)

selListLoc1 = om.MSelectionList()
selListLoc1.add("locator1")
dagLoc1 = om.MDagPath()
selListLoc1.getDagPath(0, dagLoc1)
trFnLoc1 = om.MFnTransform(dagLoc1)
vecLoc1 = trFnLoc1.translation(4)
pointLoc1 = om.MPoint(vecLoc1.x, vecLoc1.y, vecLoc1.z)
mPointOnMesh = om.MPointOnMesh()
intersector.getClosestPoint(pointLoc1,mPointOnMesh, 1000)
resultPoint = mPointOnMesh.getPoint()

# first I create vector
resultVector = om.MVector(resultPoint.x, resultPoint.y,resultPoint.z)

# then I convert to matrix
matrTrans = om.MTransformationMatrix()
matrTrans.setTranslation(resultVector,4)
localMatrix = matrTrans.asMatrix(1)
# this is the important step to get the world matrix, multiply child/local 
with the parent Matrix
worldMatr = localMatrix*matrCube
worldMatrTrans = om.MTransformationMatrix(worldMatr)

selListLoc2 = om.MSelectionList()
selListLoc2.add("locator2")
dagLoc2 = om.MDagPath()
selListLoc2.getDagPath(0, dagLoc2)
trFnLoc2 = om.MFnTransform(dagLoc2)
trFnLoc2.set(worldMatrTrans)

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Re: [Maya-Python] MMeshIntersector: Getting world position / matrix of point in object space

[Luiz Amaral]

import maya.openmaya as om

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Re: [Maya-Python] MMeshIntersector: Getting world position / matrix of point in object space

[Luiz Amaral]

Yeah good one! Try with the api 1.0

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Re: [Maya-Python] MMeshIntersector: Getting world position / matrix of point in object space

[Cedric Bazillou]

Hi guys ,
normally by design the closest point value returned by the intersector is 
in object space
http://help.autodesk.com/view/MAYAUL/2017/ENU/?guid=__cpp_ref_closest_point_cmd_2closest_point_cmd_8cpp_example_html

in the function closestPointCmd::createDisplay( MPointOnMesh 
&
 
info, MMatrix 
&
 
matrix )
we go from local to worldspace by applying the mesh parent transform ( and 
its what is used as well for the matrix initialization.) is quite horrible 
that they labelled a local point as world point though..

i would as well stay as far as possible from the OpenMaya 2 layer if i can 
as you will soon see some hidden bugs and only 30 percent of the function 
are exposed ( dont concern yourself with pythonic argument as you will need 
to convert your code to c++ if your are serious about your work)

Le jeudi 2 août 2018 15:34:56 UTC-4, Luiz Amaral a écrit :
>
> OK I’m out of ideas now :/

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Re: [Maya-Python] MMeshIntersector: Getting world position / matrix of point in object space

[Luiz Amaral]

OK I’m out of ideas now :/

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Re: [Maya-Python] MMeshIntersector: Getting world position / matrix of point in object space

[igo rov]

I get the same error

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Re: [Maya-Python] MMeshIntersector: Getting world position / matrix of point in object space

[Luiz Amaral]

Try this

meshIntersect.create(mesh, om2.MMatrix(matr))

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Re: [Maya-Python] MMeshIntersector: Getting world position / matrix of point in object space

[igo rov]

Can you execute this:

import maya.api.OpenMaya as om2

selList = om2.MGlobal.getActiveSelectionList()
dag = selList.getDagPath(0)
matr = dag.inclusiveMatrix()
mesh = dag.child(0)
meshIntersect = om2.MMeshIntersector()
meshIntersect.create(mesh, matr)


I get an error, because it won`t accept the "matr" argument

Am Donnerstag, 2. August 2018 02:19:20 UTC+2 schrieb Luiz Amaral:
>
> You should at least pass the identity matrix like this
>
> meshIntersect.create(mesh, om2.MMatrix.identity)
>

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Re: [Maya-Python] MMeshIntersector: Getting world position / matrix of point in object space

[Luiz Amaral]

You should at least pass the identity matrix like this

meshIntersect.create(mesh, om2.MMatrix.identity)

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Re: [Maya-Python] MMeshIntersector: Getting world position / matrix of point in object space

[Luiz Amaral]

Try this

matr = om2.MMatrix(dag.inclusiveMatrix())
meshIntersect.create(mesh, matr)

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Re: [Maya-Python] MMeshIntersector: Getting world position / matrix of point in object space

[igo rov]

Hi,
as for the missing Matrix parameter, there is this thread:
https://groups.google.com/forum/#!topic/python_inside_maya/axX7W8imeEU

I have the same problems as described there, if I pass the matrix I will
get this error: More keyword list entries (4) than format specifiers (2)

But you are right, there has to be a Matrix parameter as the documentation
says:.

then the matrix passed to create() should provide the mapping
from world space to the mesh's object space.


So for me the MMeshIntersector is not working

2018-08-01 23:47 GMT+02:00 Luiz Amaral :

> Hey there,
>
> “ ‘Point’ Specifies the location for which to evaluate the closest point
> on the mesh. `point' is transformed using the matrix parameter passed to
> the create() method, so for example if your matrix maps world to object
> space, then `point' should be specified in world space.”
>
> You should either pass the cube’s world matrix on creation or pass the
> point localized to the cube’s space on get closest point.
>
> Since you created the MMeshIntercector without passing a matrix to it the
> get closest point function expects a localized position.
>
> That’s why you are getting a “random” point instead of the closest point
> to locator2.
>
> If you pass the cube’s world matrix to the create just multiply the result
> of the get closest point by the same matrix and your locator will snap to
> the expected place.
>
> Or you can keep create the way it is and multiply the point by the inverse
> of the cube’s world matrix before passing it to the get closest point and
> then multiply the result by the world matrix again.
>
> Cheers,
>
> Luiz
>
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