remeshSurface | R Documentation |
This function applies uniform remeshing to a SurfaceGeometry object, creating a new mesh with more regular face sizes and improved quality.
remeshSurface(surfgeom, voxel_size = 2, ...)
surfgeom |
A |
voxel_size |
Numeric value specifying the target edge length in the remeshed output. Smaller values create finer meshes with more faces. |
... |
Additional arguments to pass to |
Remeshing is a process that reconstructs the mesh to improve its quality and/or adjust its resolution. Uniform remeshing creates a new mesh where the edge lengths are approximately equal throughout the surface, which is often desirable for analysis and visualization.
The voxel_size
parameter controls the resolution of the output mesh:
Smaller values create denser meshes with more vertices and faces
Larger values create coarser meshes with fewer vertices and faces
Common reasons to remesh a surface include:
Simplifying high-resolution meshes for faster processing
Creating more uniform triangle sizes for better numerical stability
Preparing meshes for specific analyses that require regular structures
Fixing mesh defects and improving the overall quality
This function uses the VCG library (via the Rvcg package) to perform the remeshing operation, which is a robust and widely-used algorithm for mesh processing.
A new SurfaceGeometry
object with the remeshed surface.
SurfaceGeometry
, vcgUniformRemesh
# Create a simple cube mesh
vertices <- matrix(c(
0, 0, 0, # vertex 1
1, 0, 0, # vertex 2
1, 1, 0, # vertex 3
0, 1, 0, # vertex 4
0, 0, 1, # vertex 5
1, 0, 1, # vertex 6
1, 1, 1, # vertex 7
0, 1, 1 # vertex 8
), ncol = 3, byrow = TRUE)
# Define faces (12 triangular faces making a cube)
# Note indices are 0-based
faces <- matrix(c(
# bottom face (z=0)
0, 1, 2,
0, 2, 3,
# top face (z=1)
4, 5, 6,
4, 6, 7,
# front face (y=0)
0, 1, 5,
0, 5, 4,
# back face (y=1)
2, 3, 7,
2, 7, 6,
# left face (x=0)
0, 3, 7,
0, 7, 4,
# right face (x=1)
1, 2, 6,
1, 6, 5
), ncol = 3, byrow = TRUE)
# Create the SurfaceGeometry object
surf_geom <- SurfaceGeometry(vertices, faces, "lh")
# Remesh with a coarse voxel size - fewer triangles
coarse_remesh <- remeshSurface(surf_geom, voxel_size = 0.5)
# Remesh with a fine voxel size - more triangles
fine_remesh <- remeshSurface(surf_geom, voxel_size = 0.2)
# Visualize the meshes if rgl is available
if(requireNamespace("rgl", quietly = TRUE)) {
# Original mesh
rgl::open3d()
rgl::shade3d(surf_geom@mesh, col = "red")
rgl::title3d(main = "Original Mesh")
# Coarse remesh
rgl::open3d()
rgl::shade3d(coarse_remesh@mesh, col = "green")
rgl::title3d(main = "Coarse Remesh (voxel_size = 0.5)")
# Fine remesh
rgl::open3d()
rgl::shade3d(fine_remesh@mesh, col = "blue")
rgl::title3d(main = "Fine Remesh (voxel_size = 0.2)")
# Compare the number of faces in each mesh
cat("Original mesh faces:", ncol(surf_geom@mesh$it), "\n")
cat("Coarse remesh faces:", ncol(coarse_remesh@mesh$it), "\n")
cat("Fine remesh faces:", ncol(fine_remesh@mesh$it), "\n")
}
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