New Intersect API use

[Mathew Schwartz]

I am trying to convert some old code to start working in newer maya.  It seems the API has changed as it doesnt recognize intersect as a method anymore.  (http://download.autodesk.com/us/maya/2009help/api/class_m_fn_mesh.html#4f5a5cc3ab4834b8045239a3438930dc)

I would like to simply have a start position and direction.  Then check if that vector hits an object/polygon.  

Below is how the code used to be structured   

dag = nameToDag(mesh_name)

    meshFn = om.MFnMesh()

    meshFn.setObject( dag )

    #This is the Ray being shot

    

    raySource = om.MPoint(source[0])

    rayDirection = om.MVector(source[1])

 

    pointsValue = om.MPointArray()

    polygonIdsValue = om.MIntArray()

    spaceValue = 4

    toleranceValue =  0.01

    intersectionPoints = om.MFloatPointArray()

    

    ret = om.MFnMesh.intersect(meshFn, raySource, rayDirection.normal(),

            pointsValue, toleranceValue, spaceValue, polygonIdsValue )

Now I tried replacing it with: 

    meshFn.allIntersections( raySource,                  # raySource - where we are shooting the ray from.

                             rayDirection,               # rayDirection - the direction in which we are shooting the ray.

                             None,                       # faceIds - here, we do not care if specific faces are intersected)

                             None,                       # triIds - here, we do not care if specific tri's are intersected)

                             False,                      # idsSorted - here, we do not need to sort the faceId's or triId's indices.

                             om.MSpace.kTransform, # coordinate space - the mesh's local coordinate space.

                             float(9999),                # the range of the ray.

                             False,                      # testBothDirections - we are not checking both directions from the raySource

                             None,                       # accelParams - this object is not applicable here.

                             False,                      # sortHits - we do not need to sort the intersection points along the ray.

                             intersectionPoints,         # hitPoints - the array of points which have been intersected.

                             None,                       # hitRayParams - we do not need any parametric distances of the points along the ray.

                             None,                       # hitFaces - we do not need the id's of the faces intersected.

                             None,                       # hitTriangles - we do not need the id's of the triangles intersected.

                             None,                       # hitBary1s - we do not need the barycentric coordinates of the points within the triangles.

                             None,                       # hitBary2s - we do not need the barycentric coordinates of the points within the triangles.

                             toleranceValue              # tolerance - a numeric tolerance threshold which allow intersections to occur just outside the mesh.

based on the API example from here (http://help.autodesk.com/view/MAYAUL/2015/ENU/?guid=__files_GUID_767D6572_552D_4D94_90E2_AE626F276D37_htm) 

but it is giving the error:

# Error: TypeError: file <maya console> line 100: function takes at most 11 arguments (17 given) #

Can anyone give a basic working example with a plane, or explain what the problem is?

Thanks

[Alec Fredericks]

Hey Mat,

It looks like you might be mixing API 1.0 and 2.0. Take a look at t more updated version of the API example here:

https://knowledge.autodesk.com/search-result/caas/CloudHelp/cloudhelp/2016/ENU/Maya-SDK/files/GUID-767D6572-552D-4D94-90E2-AE626F276D37-htm.html

It breaks down the API 1.0 & 2.0 differences. Your example above shows what is in the 1.0 API code, while a version of allIntersections with fewer arguments is in the 2.0 code.

Alec

[Mathew Schwartz]

Hi Alec,

Thanks for that link, I will try to figure out what my issue is using that function.  

 However, in both examples they use "allIntersections".  My old code just used a function "intersect"  from here: http://download.autodesk.com/us/maya/2009help/api/class_m_fn_mesh.html#4f5a5cc3ab4834b8045239a3438930dc

If the link you gave has API1 and API2 with the same allIntersections method, do you know what is different than the intersect method I had been using.

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[Alec Fredericks]

I'll take a look at your coffee later today to see if anything jumps out.

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