# Tag Info

Accepted

### Finding "middle curve" inside region

Maybe use Pruning and SkeletonTransform as an alternative。 ...
• 32.6k
Accepted

### STL generation for Ball-in-a-maze puzzle

Using OpenCascadeLink, which comes with Mathematica, will give you excellent results. We start by loading the package and writing a little helper function to convert the annuli to polygons in 3D space ...
• 36.1k
Accepted

### How to plot the following region with bold ribs?

I don't know how to do this with a Region, but with a BoundaryMeshRegion you can supply different styles to the 1-, 2-, and 3-...
• 63.2k

### how to make the surface of a 3D region smooth

In order to completeness,here we provide another ways to do this. Thanks @xzczd suggestion。 Related How to graph a solid common to multiple functions MeshFunctions ...
• 32.6k

### How to get a membership condition for RegionBoundary using RegionMember

cond = CylindricalDecomposition[0 < x < 2 && 0 < y < -2 x + 4, {x, y}, "Boundary" ] // Simplify (x == 0 && y >= 0 &&...
• 13.7k
Accepted

### Finding Mesh Cell Normals

Here is an approach using the undocumented RegionMeshMeshCellNormals function mentioned previously in this answer, from which the vector plotting code I show ...
• 60.1k

### Finding Mesh Cell Normals

The conventional way to get face normals is to use Newell's method (which I have also used in previous answers): ...

### Finding "middle curve" inside region

We can approximate the medial axis with the interior edges of the mesh coordinate's Voronoi diagram. Sort of similar to the answer here, but in 2D. ...
• 33k
Accepted

### Remove islands from geographic regions

Assuming that the "continental part" of a country is the one with the largest area, you can use ConnectedMeshComponents and ...
• 13.6k

### STL generation for Ball-in-a-maze puzzle

You could convert it to BoundaryMeshRegion and do operations: ...
• 13.5k

### How to plot the following region with bold ribs?

HighlightMesh[DecayVolume, 1, BoxRatios -> 1] ...
• 32.6k

### STL generation for Ball-in-a-maze puzzle

Although CSGRegion is hard to export to stl upto the 13.0.1 version. ...
• 32.6k

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• 3,762

### How to plot smooth region based on data?

I think you are after BoundingRegion: ...
• 60.1k

### Checking if two line segments intersect

For line segments in 2D, you may try also this one: ...
• 41

### Surface integral with ImplicitRegion not working as expected?

This is a bug. Integrate[z, {x, y, z} ∈ DiscretizeRegion[myReg2, MaxCellMeasure -> .01]] -25.0531
• 32.6k
Accepted

### Surface integral with ImplicitRegion not working as expected?

This is a bug, but just wanted to post an answer to share what I found. Maybe it'll help someone at Wolfram figure out what's up. Here's a plot of the region with the $z = 0$ plane shown. Weird ...
• 8,188

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• 13.5k

### How to plot smooth region based on data?

Another way will be to use alpha shapes. This is available as ConcaveHullMesh in MMA. Using your points pt we can get the ...
• 14.4k

### How to plot smooth region based on data?

A possible solution using ConvexHullMesh: chm = ConvexHullMesh[pt] Length /@ {pt, MeshPrimitives[chm, 0]} {10000, 122} ...
• 16.2k

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• 32.6k

### Compute area enclosed in a curve on a surface

As long as I've transcribed h correctly, I think this might be a case of just tidying up your integrand before putting it into ...
• 8,188

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• 13.7k

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• 13.7k

### Plot swiped domain when varying parameters

You could use ParametricRegion: ...
• 124k
Accepted

### Polygon for "Provence-Alpes-Cote-D'Azur, France"

Provence-Alpes-Côte-d'Azur is made up of 18694 coordinates in 9 polygons. A trial and error approach showed that removing polygon #4, which contains 4 points covering the island of Sainte-Marguerite, ...
• 3,762

### Remove islands from geographic regions

A country is divided into AdministrativeDivisions for which Entity data is available. ...
• 16.2k

### Plot a region between two curves that is below another in $R^3$

This should work, if I understood your question correctly: Plot3D[ x^2 + 2 y^2, {x, y} ∈ ImplicitRegion[x^2 <= y <= x, {x, y}] ]
• 60.1k