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FindMeshDefects[mreg]

finds defects in the mesh region mreg.

FindMeshDefects[mreg,{def1,…}]

finds only the specified type of defects def1, ….

FindMeshDefects[mreg,defects,format]

formats the results according to format specification.

Details and Options
Details and Options Details and Options
Examples  
Basic Examples  
Scope  
Specification  
Options  
MeshCellHighlight  
MeshCellLabel  
MeshCellMarker  
Show More Show More
MeshCellShapeFunction  
MeshCellStyle  
PlotLegends  
PlotTheme  
See Also
Related Guides
Related Workflows
History
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FindMeshDefects

FindMeshDefects[mreg]

finds defects in the mesh region mreg.

FindMeshDefects[mreg,{def1,…}]

finds only the specified type of defects def1, ….

FindMeshDefects[mreg,defects,format]

formats the results according to format specification.

Details and Options

  • By default, FindMeshDefects gives a mesh region with defects highlighted.
  • Possible geometrical defect types defi on surfaces include:
  • "HoleEdges"edges around a hole in the surface
    "TJunctionEdges"edges that form a T junction
    "TinyFaces"faces with near-zero area
    "OverlappingFaces"faces that overlap
  • Possible topological defect types defi include:
  • "IsolatedVertices"vertices without incident edges
    "DanglingEdges"edges without incident faces
    "SingularEdges"edges with more than two incident faces
    "SingularVertices"vertices with a non-disc neighborhood
    "TinyComponents"tiny connected mesh components
    "FlippedFaces"faces that point inward
  • Possible format specifications include:
  • Automaticmesh region with defects highlighted
    "Cell"association with mesh cells for each defect type
    "CellIndex"association with mesh cell indexes for each defect type
  • FindMeshDefects takes a PlotLegends option as well the options of MeshRegion.
  • With the setting PlotLegendsAutomatic, a legend is produced for each type of defect.

Examples

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Basic Examples  (1)

Find defects in a 3D mesh:

Wolfram Language code: model = ExampleData[{"Geometry3D", "StanfordBunny"}, "MeshRegion"];
Wolfram Language code: FindMeshDefects[model]

Scope  (10)

Specification  (10)

"DanglingEdges":

Wolfram Language code: FindMeshDefects[\!\(\*Graphics3DBox[«7»]\), "DanglingEdges"]

"FlippedFaces":

Wolfram Language code: FindMeshDefects[\!\(\*Graphics3DBox[«7»]\), "FlippedFaces"]

"HoleEdges":

Wolfram Language code: FindMeshDefects[\!\(\*Graphics3DBox[«7»]\), "HoleEdges"]

"IsolatedVertices":

Wolfram Language code: FindMeshDefects[\!\(\*Graphics3DBox[«7»]\), "IsolatedVertices"]

"OverlappingFaces":

Wolfram Language code: FindMeshDefects[\!\(\*Graphics3DBox[«7»]\), "OverlappingFaces"]

"SingularEdges":

Wolfram Language code: FindMeshDefects[\!\(\*Graphics3DBox[«7»]\), "SingularEdges"]

"SingularVertices":

Wolfram Language code: FindMeshDefects[\!\(\*Graphics3DBox[«7»]\), "SingularVertices"]

"TinyComponents":

Wolfram Language code: FindMeshDefects[\!\(\*Graphics3DBox[«7»]\), "TinyComponents"]

"TinyFaces":

Wolfram Language code: FindMeshDefects[\!\(\*Graphics3DBox[«7»]\), "TinyFaces"]

"TJunctionEdges":

Wolfram Language code: FindMeshDefects[\!\(\*Graphics3DBox[«7»]\), "TJunctionEdges"]

Options  (14)

MeshCellHighlight  (2)

MeshCellHighlight allows you to specify highlighting for parts of a MeshRegion:

Wolfram Language code: ℛ = MeshRegion[{{0, 0, 0}, {1, 0, 0}, {2, 0, 0}, {3, 0, -1 / 2}, {3, 0, 1 / 2}, {4, -1 / 2, 0}, {4, 1 / 2, 0}}, {Point[1], Line[{2, 3}], Triangle[{3, 4, 5}], Tetrahedron[{4, 6, 5, 7}]}];
Wolfram Language code: FindMeshDefects[ℛ, "SingularEdges", MeshCellHighlight -> {{0, All} -> Red}]

Individual cells can be highlighted using their cell index:

Wolfram Language code: ℛ = MeshRegion[{{0, 0, 0}, {1, 0, 0}, {2, 0, 0}, {3, 0, -1 / 2}, {3, 0, 1 / 2}, {4, -1 / 2, 0}, {4, 1 / 2, 0}}, {Point[1], Line[{2, 3}], Triangle[{3, 4, 5}], Tetrahedron[{4, 6, 5, 7}]}];
Wolfram Language code: FindMeshDefects[ℛ, "SingularEdges", MeshCellHighlight -> {{1, 1} -> {Thick, Yellow}, {1, 3} -> {Dashed, Black}}]

Or by the cell itself:

Wolfram Language code: ℛ = MeshRegion[{{0, 0, 0}, {1, 0, 0}, {2, 0, 0}, {3, 0, -1 / 2}, {3, 0, 1 / 2}, {4, -1 / 2, 0}, {4, 1 / 2, 0}}, {Point[1], Line[{2, 3}], Triangle[{3, 4, 5}], Tetrahedron[{4, 6, 5, 7}]}];
Wolfram Language code: FindMeshDefects[ℛ, "SingularEdges", MeshCellHighlight -> {Line[{6, 5}] -> {Thick, Yellow}, Line[{4, 6}] -> {Dashed, Black}}]

MeshCellLabel  (2)

MeshCellLabel can be used to label parts of a MeshRegion:

Wolfram Language code: ℛ = MeshRegion[{{0, 0, 0}, {1, 0, 0}, {2, 0, 0}, {3, 0, -1 / 2}, {3, 0, 1 / 2}, {4, -1 / 2, 0}, {4, 1 / 2, 0}}, {Point[1], Line[{2, 3}], Triangle[{3, 4, 5}], Tetrahedron[{4, 6, 5, 7}]}];
Wolfram Language code: FindMeshDefects[ℛ, "SingularEdges", MeshCellLabel -> {0 -> "Index"}]

Individual cells can be labeled using their cell index:

Wolfram Language code: ℛ = MeshRegion[{{0, 0, 0}, {1, 0, 0}, {2, 0, 0}, {3, 0, -1 / 2}, {3, 0, 1 / 2}, {4, -1 / 2, 0}, {4, 1 / 2, 0}}, {Point[1], Line[{2, 3}], Triangle[{3, 4, 5}], Tetrahedron[{4, 6, 5, 7}]}];
Wolfram Language code: FindMeshDefects[ℛ, "SingularEdges", MeshCellLabel -> {{1, 1} -> "x", {1, 2} -> "y"}]

Or by the cell itself:

Wolfram Language code: ℛ = MeshRegion[{{0, 0, 0}, {1, 0, 0}, {2, 0, 0}, {3, 0, -1 / 2}, {3, 0, 1 / 2}, {4, -1 / 2, 0}, {4, 1 / 2, 0}}, {Point[1], Line[{2, 3}], Triangle[{3, 4, 5}], Tetrahedron[{4, 6, 5, 7}]}];
Wolfram Language code: FindMeshDefects[ℛ, "SingularEdges", MeshCellLabel -> {Line[{6, 5}] -> "x", Line[{5, 4}] -> "y"}]

MeshCellMarker  (1)

MeshCellMarker can be used to assign values to parts of a MeshRegion:

Wolfram Language code: ℛ = MeshRegion[{{1, 0, 0}, {1, 0, 1}, {1, 1, 1}, {0, 0, 1}}, Polygon[{{3, 2, 1}, {4, 3, 2}, {3, 1, 4}, {1, 2, 4}}]];
Wolfram Language code: FindMeshDefects[ℛ, "FlippedFaces", MeshCellMarker -> {{0, 1} -> 1, {0, 2} -> 2, {0, 3} -> 3, {0, 4} -> 4}]

Use MeshCellLabel to show the markers:

Wolfram Language code: ℛ = MeshRegion[{{1, 0, 0}, {1, 0, 1}, {1, 1, 1}, {0, 0, 1}}, Polygon[{{3, 2, 1}, {4, 3, 2}, {3, 1, 4}, {1, 2, 4}}]];
Wolfram Language code: FindMeshDefects[ℛ, "FlippedFaces", MeshCellMarker -> {{0, 1} -> 1, {0, 2} -> 2, {0, 3} -> 3, {0, 4} -> 4}, MeshCellLabel -> {0 -> "Marker"}]

MeshCellShapeFunction  (2)

MeshCellShapeFunction allows you to specify functions for parts of a MeshRegion:

Wolfram Language code: ℛ = MeshRegion[{{1, 0, 0}, {1, 0, 1}, {1, 1, 1}, {0, 0, 1}}, Polygon[{{3, 2, 1}, {4, 3, 2}, {3, 1, 4}, {1, 2, 4}}]];
Wolfram Language code: FindMeshDefects[ℛ, "FlippedFaces", MeshCellShapeFunction -> {0 -> (Sphere[#, .1]&)}]

Individual cells can be drawn using their cell index:

Wolfram Language code: ℛ = MeshRegion[{{1, 0, 0}, {1, 0, 1}, {1, 1, 1}, {0, 0, 1}}, Polygon[{{3, 2, 1}, {4, 3, 2}, {3, 1, 4}, {1, 2, 4}}]];
Wolfram Language code: FindMeshDefects[ℛ, "FlippedFaces", MeshCellShapeFunction -> {{0, 1} -> (Sphere[#, .1]&), {0, 2} -> (Sphere[#, .15]&)}]

Or by the cell itself:

Wolfram Language code: ℛ = MeshRegion[{{1, 0, 0}, {1, 0, 1}, {1, 1, 1}, {0, 0, 1}}, Polygon[{{3, 2, 1}, {4, 3, 2}, {3, 1, 4}, {1, 2, 4}}]];
Wolfram Language code: FindMeshDefects[ℛ, "FlippedFaces", MeshCellShapeFunction -> {Point[1] -> (Sphere[#, .1]&), Point[2] -> (Sphere[#, .15]&)}]

MeshCellStyle  (2)

MeshCellShapeFunction allows you to specify functions for parts of a MeshRegion:

Wolfram Language code: ℛ = MeshRegion[{{1, 0, 0}, {1, 0, 1}, {1, 1, 1}, {0, 0, 1}}, Polygon[{{3, 2, 1}, {4, 3, 2}, {3, 1, 4}, {1, 2, 4}}]];
Wolfram Language code: FindMeshDefects[ℛ, "FlippedFaces", MeshCellStyle -> {{1, All} -> Red, {0, All} -> Black}]

Individual cells can be highlighted using their cell index:

Wolfram Language code: ℛ = MeshRegion[{{1, 0, 0}, {1, 0, 1}, {1, 1, 1}, {0, 0, 1}}, Polygon[{{3, 2, 1}, {4, 3, 2}, {3, 1, 4}, {1, 2, 4}}]];
Wolfram Language code: FindMeshDefects[ℛ, "FlippedFaces", MeshCellStyle -> {{1, 1} -> {Thick, Red}, {1, 2} -> {Dashed, Black}}]

Or by the cell itself:

Wolfram Language code: ℛ = MeshRegion[{{1, 0, 0}, {1, 0, 1}, {1, 1, 1}, {0, 0, 1}}, Polygon[{{3, 2, 1}, {4, 3, 2}, {3, 1, 4}, {1, 2, 4}}]];
Wolfram Language code: FindMeshDefects[ℛ, "FlippedFaces", MeshCellStyle -> {Line[{3, 2}] -> {Thick, Red}, Line[{2, 1}] -> {Dashed, Black}}]

PlotLegends  (3)

Use editable placeholders as the legend:

Wolfram Language code: ℛ = MeshRegion[{{0, 0, 0}, {1, 0, 0}, {2, 0, 0}, {3, 0, -1 / 2}, {3, 0, 1 / 2}, {4, -1 / 2, 0}, {4, 1 / 2, 0}}, {Point[1], Line[{2, 3}], Triangle[{3, 4, 5}], Tetrahedron[{4, 6, 5, 7}]}];
Wolfram Language code: FindMeshDefects[ℛ, {"SingularVertices", "DanglingEdges"}, PlotLegends -> Automatic]

Use the type being used as the legend:

Wolfram Language code: ℛ = MeshRegion[{{0, 0, 0}, {1, 0, 0}, {2, 0, 0}, {3, 0, -1 / 2}, {3, 0, 1 / 2}, {4, -1 / 2, 0}, {4, 1 / 2, 0}}, {Point[1], Line[{2, 3}], Triangle[{3, 4, 5}], Tetrahedron[{4, 6, 5, 7}]}];
Wolfram Language code: FindMeshDefects[ℛ, {"SingularVertices", "DanglingEdges"}, PlotLegends -> "Defects"]

Use Placed to control the placement of legends:

Wolfram Language code: ℛ = MeshRegion[{{0, 0, 0}, {1, 0, 0}, {2, 0, 0}, {3, 0, -1 / 2}, {3, 0, 1 / 2}, {4, -1 / 2, 0}, {4, 1 / 2, 0}}, {Point[1], Line[{2, 3}], Triangle[{3, 4, 5}], Tetrahedron[{4, 6, 5, 7}]}];
Wolfram Language code: FindMeshDefects[ℛ, {"SingularVertices", "DanglingEdges"}, PlotLegends -> Placed["Defects", Below]]

PlotTheme  (2)

Use a theme with grid lines and a legend:

Wolfram Language code: FindMeshDefects[MeshRegion[{{1, 0, 0}, {1, 0, 1}, {1, 1, 1}, {0, 0, 1}}, Polygon[{{3, 2, 1}, {4, 3, 2}, {3, 1, 4}, {1, 2, 4}}]], "FlippedFaces", PlotTheme -> "Detailed"]

Use a theme to draw a wireframe:

Wolfram Language code: FindMeshDefects[MeshRegion[{{1, 0, 0}, {1, 0, 1}, {1, 1, 1}, {0, 0, 1}}, Polygon[{{3, 2, 1}, {4, 3, 2}, {3, 1, 4}, {1, 2, 4}}]], "FlippedFaces", PlotTheme -> "Lines"]
Wolfram Research (2016), FindMeshDefects, Wolfram Language function, https://reference.wolfram.com/language/ref/FindMeshDefects.html.

Text

Wolfram Research (2016), FindMeshDefects, Wolfram Language function, https://reference.wolfram.com/language/ref/FindMeshDefects.html.

CMS

Wolfram Language. 2016. "FindMeshDefects." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/FindMeshDefects.html.

APA

Wolfram Language. (2016). FindMeshDefects. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/FindMeshDefects.html

BibTeX

@misc{reference.wolfram_2026_findmeshdefects, author="Wolfram Research", title="{FindMeshDefects}", year="2016", howpublished="\url{https://reference.wolfram.com/language/ref/FindMeshDefects.html}", note=[Accessed: 12-June-2026]}

BibLaTeX

@online{reference.wolfram_2026_findmeshdefects, organization={Wolfram Research}, title={FindMeshDefects}, year={2016}, url={https://reference.wolfram.com/language/ref/FindMeshDefects.html}, note=[Accessed: 12-June-2026]}