Make a boundary around a mask with two levels of decimation, and apply to a mask.
mask_with_boundary_surf(
vertices,
faces,
mask,
width1 = 4,
k1 = 2,
width2 = 6,
k2 = 3
)A new mesh (list with components vertices and faces)
A \(V \times 3\) matrix, where each row contains the Euclidean coordinates at which a given vertex in the mesh is located. \(V\) is the number of vertices in the mesh
An \(F \times 3\) matrix, where each row contains the vertex indices for a given triangular face in the mesh. \(F\) is the number of faces in the mesh.
A length \(V\) logical vector indicating if each vertex is within the input mask.
the width of the middle/outer region. All vertices in the middle/outer region
are between 1 and width1 edges away from the closest vertex in mask/middle region.
roughly, the triangle size multiplier. Every k1/k2 vertex within
every k1/k2 layer (beginning with the innermost layer) will be retained;
the rest will be discarded. If the mesh originally has triangles of regular
size, the sides of the triangles in the middle/outer region will be about
k1/k2 as long.
The boundary consists of a width1-vertex-wide middle region and a
width2-vertex-wide outer region, for a total of width1 + width2 layers
of vertices surrounding the input mask. In the first layer, every k1
vertex within every k1 layer (beginning with the innermost
layer) is retained; the rest are discarded. In the second layer, every
k2 vertex within every k2 layer (beginning with the innermost
layer) is retained; the rest are discarded. It is recommended to make width1
a multiple of k1 and width2 a multiple of k2.
Default boundary: a 4-vertex wide middle region with triangles twice as long, and a 6-vertex wide outer region with triangles three times as long.