[vtkusers] Creating a parallel version of vtkOBBTree.IntersectWithLine

[Guillaume Jacquenot]

Dear VTK users,

I am using vtkOBBTree class to find the intersection of a ray with a mesh.

I am interested in running this method in parallel for multiple rays on
multiple CPUs or GPUs.

For time being, I have this Python snippet

obb_tree = vtk.vtkOBBTree()
obb_tree.SetDataSet(vtkPolyData)
obb_tree.BuildLocator()
points = vtk.vtkPoints()
points.SetDataTypeToDouble()
cellIds = vtk.vtkIdList()
code = self.obb_tree.IntersectWithLine(pSource, pTarget, points, cellIds)



In this thread, I have a solution where I create several vtkOBBTree instance
in different threads with openmp

https://stackoverflow.com/questions/45589572/why-does-openmp-not-parallelize-vtk-intersectwithline-code

Is it the good solution wrt to performance?
Are there other VTK mechanism to speed-up computation?

Can VTK-m be a solution? Can VTK-m classes be used to build a vtkOBBTree
equivalent?

Thanks


Regards,
Guillaume Jacquenot
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