CODEWITHSUNDEEP
vtk
user2426357
user2426357

Reputation: 31

vtk oriented bounding box in 3d space

I have a set of data points in the 3D space and would like to fit a bounding box to them. I know that vtkOBBTree::ComputeOBB can do this for me. But I can't seem to figure out how to visualize the oriented bounding box.

Any help is appreciated!

Upvotes: 1

Views: 1959

Answers (1)

MrPedru22
MrPedru22

Reputation: 1344

For a bounding box you can use vtkOutlineFilter. You just have to set as input the 3D data that you want to fit. Then you create the mapper and the actor, and add it to the scene, as you would do in a typical VTK scenario. Here is a working example, in Python:

from vtk import *

quadric = vtkQuadric()
quadric.SetCoefficients(.5, 1, .2, 0, .1, 0, 0, .2, 0, 0)

sample = vtkSampleFunction()
sample.SetSampleDimensions(50,50,50)
sample.SetImplicitFunction(quadric)

contour = vtkContourFilter()
contour.SetInputConnection(sample.GetOutputPort())
contour.GenerateValues(5,0,1)

contourMapper = vtkPolyDataMapper()
contourMapper.SetInputConnection(contour.GetOutputPort())
contourMapper.SetScalarRange(0,1.2)

contourActor = vtkActor()
contourActor.SetMapper(contourMapper)

outline = vtkOutlineFilter()
outline.SetInputConnection(sample.GetOutputPort())

outlineMapper = vtkPolyDataMapper()
outlineMapper.SetInputConnection(outline.GetOutputPort())

outlineActor = vtkActor()
outlineActor.SetMapper(outlineMapper)
outlineActor.GetProperty().SetColor(1,1,1)

ren = vtkRenderer()
ren.SetBackground(0.188,0.373,0.647)
ren.AddActor(contourActor)
ren.AddActor(outlineActor)

renWin = vtkRenderWindow()
renWin.AddRenderer(ren)
renWin.SetWindowName("IsoSurface")
renWin.SetSize(500,500)

iren = vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)

renWin.Render()
iren.Initialize()
iren.Start()

Upvotes: 1

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