Questions tagged [mesh]
Questions on the use and creation of meshes including the use of MeshRegion, ElementMesh, and TetGenLink.
623
questions
4
votes
1answer
66 views
VoronoiMesh with boundary edges removed
I would like to create a Voronoi diagram without the boundary edges highlighted.
This code
gVD = VoronoiMesh[X, MeshCellStyle -> {{1, All} -> {Thick, Red}}]
...
4
votes
1answer
137 views
Drawing a “realistic” VoronoiMesh
Consider a set of points generated via Lloyd's relaxation algorithm
...
1
vote
0answers
48 views
Extract data from ConvexHullMesh [closed]
I have a ConvexHullMesh and want to extract the bounding points.
I am familiar with using Cases to extract data from plots but ...
0
votes
0answers
51 views
Why BoundingRegion Fails in such cases
When I was playing this answer of tube, function TubePolygons used in my question.
...
0
votes
1answer
70 views
Mesh Refinement for interpolation of f[x,y] fails for all but the simplest f
I would like to interpolate a function, f[x,y,z], on a mesh of the unit cube, starting with a coarse tetrahedral mesh and refining tetrahedra as needed to reduce the interpolation error below a ...
2
votes
1answer
105 views
Finding lower boundary of a 3D object in list format
I have the following point list and would like to find the points located in the lower boundary of the 3D object (It is part of a body torso).
https://pastebin.com/L12n0Gfr
I am using the following ...
3
votes
0answers
70 views
Unfold/develop a RevolutionPlot3D mesh onto a 2D plane?
I'm making my own blimp out of emergency blankets (Mylar), and I want it to have a NACA0025 airfoil shape. I'm new to Mathematica, but I still managed to create the shape I wanted with ...
14
votes
3answers
239 views
Ordering Problem With VoronoiMesh
Imagine I want to model 2D cells moving in a tissue. Consider, as an example, Lloyd's relaxation algorithm. Using VoronoiMesh I'm able to mimic some cell movement. ...
4
votes
1answer
95 views
Capturing mesh information
Mesh information
Using the helpful tips from Triangular mesh of random points on a sphere, it's easy to generate solids:
...
14
votes
2answers
510 views
How to make a structured mesh with a hole and extrude it
I am trying to use the FEMAddOns package to make a structured mesh with a hole and then extrude it. As a warm up example this worked nicely.
...
4
votes
1answer
167 views
MeshRefinementFunction analogue for ToElementMesh
MeshRefinementFunction according to the documentation is an option for DiscretizeRegion. Is there an analogue for ...
5
votes
1answer
97 views
How to create a 1D mesh from a curved line (with ToElementMesh)
I want to create an element mesh from an arc $x=Rcos(\varphi), y=Rsin(\varphi)$, with $R=100, \varphi \in [0,\pi/4]$ which looks like this:
...
7
votes
2answers
277 views
Computing volume of intersection of two regions
I am trying to compute the volume of intersection of the following two regions:
...
7
votes
1answer
231 views
Convert ConvexHull to Inequality
I have the following convex hull.
P0={0,0,0};
P1={1,0,0};
P2={0,1,0};
P3={0,0,1};
ConvexHullMesh[{P0,P1,P2,P3}]
Now I want the region algebraically as equality ...
0
votes
0answers
88 views
Surface area of a list of points
I would like to know how I can get the area of the following point list. I am using the following script to make a mesh region and then find the area. However, the area is much larger than the value ...
0
votes
1answer
67 views
RegionResize works improperly with different digital accuracy
The data is copied from the output cell of my original data.
...
2
votes
1answer
137 views
Plotting Cartesian mesh on Sphere with SphericalPlot3D
I really want to know how to plot the Cartesian grid lines on a 2D plane onto a sphere in the context of stereographic projection. I found this image showing what I want to plot. Can anyone help me to ...
9
votes
3answers
728 views
How to determine if a point is within a concave 3D polyhedron?
Generally, if you have a 3D polyhedron and wanted to check if a point was within it, you would use something like a ConvexHullMesh to create a region, which you can ...
1
vote
1answer
72 views
How to efficiently animate changing mesh on a fixed 3D plot?
Say I'd like to visualise a height function of a torus by animating a plane going upwards, and highlighting the intersection via Mesh/...
9
votes
1answer
137 views
Why do some PlotThemes not work with Mesh as expected? What can be done about it?
While updating my answer for (189038) I noted that some PlotThemes do not work with Mesh in a meaningful way:
...
5
votes
1answer
114 views
How to draw surface with four space curves as boundaries
How to draw a surface with four space curves as boundaries of the surface?
...
4
votes
1answer
126 views
MeshTools package: can one translate 3d meshes in order to then merge them?
I have created a 3d region for Laplace's eqn
...
11
votes
4answers
657 views
Area/Volume of a 2D/3D object as it is filled up with water
How could I get the volume of water on a region as it is filled up with water from below? Assume gravity points in some appropriate downward axis like -y (or -z in 3D) so the water fills upward from ...
7
votes
1answer
149 views
RandomPoint inside mesh for walk-on-spheres Monte Carlo PDE solver
I'm trying to understand a Monte-Carlo Laplace/Poisson PDE solver:
http://www.cs.cmu.edu/~kmcrane/Projects/MonteCarloGeometryProcessing/paper.pdf
This method inspired by random-walks and ray-tracing ...
5
votes
0answers
58 views
DelauneyMesh in 4d and higher
Is there any way to find the DelauneyMesh in 4D (or higher)? Its documentation implies that it should be possible "A Delaunay mesh consists of intervals (in 1D), ...
1
vote
0answers
101 views
Periodic Voronoi Mesh in a box
Is it possible to generate a periodic Voronoi Mesh inside a rectangular domain? I would also like to obtain the coordinates of each cell separately so that I can perform further operations on each ...
2
votes
0answers
66 views
0
votes
1answer
64 views
How to find out the number of nodes in the interval of mesh [closed]
I have a mesh created for the femur. I need to apply a total load of 800 N in the range 480 < z < 500. To do this, I need to know the number of nodes in this interval in order to apply Force to ...
8
votes
2answers
579 views
How to add 'border' to Voronoi diagram
Suppose I have a set of points pts, from which I generate a Voronoi diagram VD:
...
4
votes
2answers
165 views
FEM 2D mesh with inclusion
I want to create a FEM mesh with an inclusion, but I want to define the coordinates of the edge nodes manually, since I need the nodes for a problem that requires periodic boundary conditions.
The ...
0
votes
0answers
53 views
How can I convert such a model into a BoundaryMeshRegion
The obj file is here
As you see, I cannot import such a house model into Mathematica with BoundaryMeshRegion Option.
Import[objFile, "BoundaryMeshRegion"]
So my ...
1
vote
0answers
48 views
How to find intersection of higher dimensional convex hull?
I have often used ConvexHullMesh to obtain a convex hull for 2-d and 3-d points. But when I try to find it for 4-D points I encounter error even for simple cases.
<...
1
vote
1answer
80 views
Represent a Concave Mesh Volume
I programmatically generate a shape, where the top surface is defined by a series of polygons. I generate all the points of the polygon.
...
3
votes
2answers
151 views
Finding mesh elements within a given region
I write a code that generates the following mesh. I would like to find out the elements that completely lie within a certain circular region inside this meshed area. How do I do that?
The code that I ...
3
votes
1answer
62 views
Euler Characteristic of MengerMesh
When I ask Mathematica to give me the Euler characteristic of MengerMesh[1, 3], it returns 16. It seems to me the 1-step Menger sponge has genus 5 and should ...
0
votes
0answers
188 views
Projecting a 3D mesh region to 2D
How do I project a 3D MeshRegion to a 2D MeshRegion (or equivalent for a BoundaryMeshRegion). This question is similar to ...
5
votes
1answer
175 views
How to export a volume mesh?
Let's say that I generate a volume mesh using the following command:
Icosahedron[] // BoundaryDiscretizeGraphics // TriangulateMesh
which gives the following:
As ...
0
votes
1answer
67 views
1
vote
0answers
30 views
NearestMeshCells in Mathematica 11.3
Is there an efficient way of writing a function equivalent to NearestMeshCells (Mathematica 12.1) in Mathematica 11.3? I'm trying to write my own code, which I can ...
6
votes
2answers
346 views
8
votes
1answer
232 views
Generating a Periodic Voronoi Mesh
Consider the following hexagonal mesh, created from VoronoiMesh
...
1
vote
1answer
49 views
2
votes
1answer
92 views
4
votes
1answer
142 views
2
votes
1answer
81 views
How can I calculate volume of such a MeshRegion Object
The Data is here:
meshData
===
PolygonData is here
...
5
votes
1answer
112 views
Assigning ElementMarkers to existing ElementMesh boundaries
I've imported a 2D element mesh from another program as a list of triangle coordinates {{x1,y1},{x2,y2}....} ("nodes") and element connections {{n1,n2,n3},...} ("elements"). Then I create an ...
3
votes
1answer
128 views
How to divide a region in FEM with a parametric curve?
I'm using NDSolve with finite element to try to solve a heat transfer problem. The region I have is a rectangle where the four vertices are at ...
1
vote
2answers
57 views
Different style for vertical and horizontal lines in ListStepPlot
I would like to color the horizontal portions (the data) of a ListStepPlot in one style (e.g., blue) and the vertical (linking lines) in a different style (e.g., ...
6
votes
1answer
123 views
FEM Simulation: Meshing two Arbitrary objects in an “air” mesh
Based on this excellent answer to my previous question: FEM: Electric Field between two arbitrary defined shapes
I wanted to try out other shapes:
...
5
votes
2answers
197 views
Mesh on cross section of meshes / 2D Region on cross section of 3D Regions
Context
This is fairly general and simple question, (probably because it has a simple solution?). I want to define a mesh (e.g. to be used with Plot3D or FEM or ...
