how to fill a surface to obtain a 3D mask

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Mads
Mads on 10 Jan 2018
Commented: Mads on 11 Jan 2018
I have a script that gives me 3D coordinates of the surface of a 3D object.
I would like to obtain a mask in 3D where everything on and inside the surface is true, and everthing outside the surface is false.
The mask could for example be of size 64-by-64-by-64.
Roughly speaking a 3D version of imfill() that tolerates not all points being connected once they are placed in the mask grid.

Answers (1)

Image Analyst
Image Analyst on 10 Jan 2018
Is there any problem with just doing it one slice at a time using imfill()?
  1 Comment
Mads
Mads on 11 Jan 2018
When for a given slice the points are connected, there is no problem. But when the curve is not closed imfill() doesn't work. I have tried imdilate() followed by imerode() to "invent" the missing points, but the operations seem to be a bit too harsh on the other parts of the curve. I wonder if there is some interpolation method that can fill out missing portions of the curve to close it...

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