WrapSolidify surface

siaeleni · February 10, 2021, 3:40pm

Hello,

I use Wrap Solifidy feature in order to create the outer surface of a model, but I get some strange results like the photo attached. Do you have any idea why?

Thanks!
notsmooth

lassoan · February 10, 2021, 3:47pm

This happens because shrinking step sometimes finds the inner surface of the shell. This is fixed in this pull request, so updating to latest version of the extension in latest Slicer Stable Release or latest Slicer Preview Release should fix the problem. If you still encounter these artifacts then locate SegmentEditorEffect.py file on your computer and change 100 to a smaller number (50, 20, 10).

github.com

sebastianandress/Slicer-SurfaceWrapSolidify/blob/9e9e15ea0a9cc7a03f75a6aaf8451e755967695f/SegmentEditorWrapSolidify/SegmentEditorWrapSolidifyLib/SegmentEditorEffect.py#L484


    maxRadius = max(diameters)/2.0
    sphereSource = vtk.vtkSphereSource()
    # to make sure the volume is fully included in the sphere, radius must be sqrt(2) times larger
    sphereSource.SetRadius(maxRadius*1.5)
    # Set resolution to be about one magnitude lower than the final resolution
    # (by creating an initial surface element for about every 100th final element).
    sphereSurfaceArea = 4 * math.pi * maxRadius*maxRadius
    voxelSurfaceArea = spacing * spacing
    numberOfSurfaceElements = sphereSurfaceArea/voxelSurfaceArea
    numberOfIinitialSphereSurfaceElements = numberOfSurfaceElements/100
    sphereResolution = math.sqrt(numberOfIinitialSphereSurfaceElements)
    # Set resolution to minimum 10
    sphereResolution = max(int(sphereResolution), 10)
    sphereSource.SetPhiResolution(sphereResolution)
    sphereSource.SetThetaResolution(sphereResolution)
    sphereSource.SetCenter((bounds[0]+bounds[1])/2.0, (bounds[2]+bounds[3])/2.0, (bounds[4]+bounds[5])/2.0)
    sphereSource.Update()
    initialRegionPd = sphereSource.GetOutput()
elif self.region == REGION_SEGMENT:
  # create initial region from segment (that will be grown)

Let us know how if it worked.

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WrapSolidify surface

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