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fangq / iso2mesh

Iso2Mesh - a 3D surface and volumetric mesh generator for MATLAB/Octave
http://iso2mesh.sf.net
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v2m parameter "isovalues" #31

Closed artturuohola closed 5 years ago

artturuohola commented 5 years ago

isovalues: a list of isovalues where the levelset is defined

Is there another way to explain what this parameter is, I don't understand it.

fangq commented 5 years ago

do you want to suggest something? it seems clear to me, despite brief.

artturuohola commented 5 years ago

Okay, Hmm I have a volumetric image consisting of grayscale colors 64 and 128, the shape is a sphere of radius 200, centrer at (250,250,250). What would the isovalues be in this case?

Thank you

fangq commented 5 years ago

@artturuohola, any value between 64 and 128 will give you the boundary between the two regions. there is a linear interpolation between the adjacent voxel, so, choosing different value will produce a very slightly different surface. If there is no particular reason, I typically choose the middle point (64+128)/2=96

artturuohola commented 5 years ago

Thank you, what value would you choose in the case of a head volume, consisting of air, bone, skin, csf, gray and white matter, defined by colors 42.5000 85.0000 127.5000 170.0000 212.5000 255.0000?

fangq commented 5 years ago

@artturuohola, you won't be able to use v2m to create a multi-label mesh using isosurfaces (unless you volume is a gray-scale image with each level-set completely separate from another one.

you should consider setting isovalues to [] and set method to 'cgalmesh'.