Examples

NRRD Data

The file for this example can be found here: http://www.slicer.org/slicerWiki/images/0/00/CTA-cardio.nrrd

using Meshing
using FileIO
using NRRD
using WGLMakie
using Downloads
using GeometryBasics

nrrd = Downloads.download("http://www.slicer.org/slicerWiki/images/0/00/CTA-cardio.nrrd")

# load the file as an AxisArray
ctacardio = load(nrrd)

# use marching cubes with isolevel at 100
#algo = MarchingCubes(iso=100)
# use marching tetrahedra with iso at 100
 algo = MarchingTetrahedra(iso=100)


# generate the mesh using marching cubes
vts, fcs = isosurface(ctacardio, algo)

WGLMakie.mesh(vts, map(v -> GeometryBasics.TriangleFace(v...), fcs))

Gyroid and Isocaps

We do not provide an equivalent to isocaps in Matlab, though a similar result may be achieved by setting the boundary to a large value:

using GeometryTypes

gyroid(v) = cos(v[1])*sin(v[2])+cos(v[2])*sin(v[3])+cos(v[3])*sin(v[1])
gyroid_shell(v) = max(gyroid(v)-0.4,-gyroid(v)-0.4)

xr,yr,zr = ntuple(_->LinRange(0,pi*4,50),3)

A = [gyroid_shell((x,y,z)) for x in xr, y in yr, z in zr]
A[1,:,:] .= 1e10
A[:,1,:] .= 1e10
A[:,:,1] .= 1e10
A[end,:,:] .= 1e10
A[:,end,:] .= 1e10
A[:,:,end] .= 1e10

vts, fcs = isosurface(A, MarchingCubes())

# view with Makie
import WGLMakie
using LinearAlgebra
WGLMakie.mesh(vts, map(v -> GeometryBasics.TriangleFace(v...), fcs), color=[norm(v) for v in v])