Which software for watertight meshes? (volume calculation)

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Tsunami
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Which software for watertight meshes? (volume calculation)

Post by Tsunami »

Hey there!

I have to calculate the volume of some boulders.
As they are naturally lying on the ground, I cannot get a perfect cloud as the bottom part isn't accessible.

I tried to generate meshes in Meshlab and CloudComapare, however I will always have some kind of strange "bubble" in the lower part, where point density is very low.
Image

How can I avoid this? I tried all options but I couldn't find a way to do it properly.
I did Poisson Reconstruction and Ball Pivoting using various Parameters.
I don't need a super high accuracy, but with this result I cannot work...

I attached two example files, maybe you can help?
http://www.file-upload.net/download-115 ... e.pts.html

Thanks guys!
mca
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Re: Which software for watertight meshes? (volume calculatio

Post by mca »

If you get bubbles at places where you have enough points for a proper reconstruction, you have probably normals pointing into the wrong direction. The big bubble at the bottom where no input points are available is to be expected when using Poisson Reconstruction.
  • Check your normal direction in MeshLab (Render -> Show Normal/Curvature) Make sure all normals point outside the boulder!
  • Delete the bubble at the bottom manually after meshing (Use the select and delete tool)
  • Close the hole at the bottom again with (Filter -> Remeshing -> Close Holes)
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