Mesh FromPartShape/ro: Difference between revisions

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<languages/>
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{{Docnav|[[Mesh Export|Export Mesh]]|[[Mesh CurvaturePlot|Curvature Plot]]|[[Mesh_Workbench|Mesh]]|IconL=Mesh_ExportMesh.png|IconC=Workbench_Mesh.svg|IconR=Mesh_CurvaturePlot.png}}


{{Docnav
{{GuiCommand|Name=Mesh MeshFromShape‏‎|MenuLocation=Meshes → Create Mesh from Shape|Workbenches=[[Mesh Workbench|Mesh]]|SeeAlso=}}
|[[Mesh_Export|Export]]
|[[Mesh_RemeshGmsh|RemeshGmsh]]
|[[Mesh_Workbench|Mesh]]
|IconL=Mesh_Export.svg
|IconR=Mesh_RemeshGmsh.svg
|IconC=Workbench_Mesh.svg
}}


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{{GuiCommand
|Name=Mesh FromPartShape
|MenuLocation=Meshes → Create Mesh from Shape
|Workbenches=[[Mesh Workbench|Mesh]]
|SeeAlso=
}}
</div>

==Description==

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==Introducere==
==Introducere==
Această comandă creează o plasă dintr-un obiect tip formă.
Această comandă creează o plasă dintr-un obiect tip formă.
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The inverse operation is [[Part_ShapeFromMesh|Part ShapeFromMesh]] from the [[File:Workbench_Part.svg|24px]] [[Part_Workbench|Part Workbench]].
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<span id="Usage"></span>
==Utilizare==
==Utilizare==
# Selectați obiectul de tip formă.
# Selectați obiectul de tip formă.
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<br />
<br />
Doar selectând {{KEY| Meshes}} → {{KEY|[[Image:Mesh_Mesh_from_Shape.svg|32px]] Create Mesh from shape...}} vă va oferi un meniu suplimentar pentru a vă alege forma de transformat în plasă
Doar selectând {{KEY| Meshes}} → {{KEY|[[Image:Mesh_Mesh_from_Shape.svg|32px]] Create Mesh from shape...}} vă va oferi un meniu suplimentar pentru a vă alege forma de transformat în plasă
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<span id="Meshers"></span>
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==Notes==
* Tutorial: [[Export_to_STL_or_OBJ|Export_to_STL_or_OBJ]]
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[[Image:Mesh_Mesher_Standard.jpg]]
[[Image:Mesh_Mesher_Standard.jpg]]
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<span id="Standard_mesher"></span>
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[[Image:Mesh_Mesher_Mefisto.jpg]]
[[Image:Mesh_Mesher_Mefisto.jpg]]
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Lungimea maximă a muchiei: dacă acest număr este mai mic, ochiul devine mai fin. Valoarea cea mai mică este de 0,000.
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<span id="Mefisto_mesher"></span>
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Puteți alege între plase fiind:
Puteți alege între plase fiind:
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* Elemente de ordine al doilea: Fie elementele de ordinul doi vor fi generate.
* Elemente de ordine al doilea: Fie elementele de ordinul doi vor fi generate.
* Quad dominantă: Dacă ochiurile vor fi aranjate ca hexahedral.
* Quad dominantă: Dacă ochiurile vor fi aranjate ca hexahedral.
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'''Standard Mesher'''
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<span id="Netgen_mesher"></span>
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'''Netgen Mesher'''
'''Netgen Mesher'''
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* {{MenuCommand|Fineness}}: select an options for the finesse of the mesh:
[[Image:Mesh_Mesher_Netgen.jpg]]
** {{MenuCommand|Very coarse}}
** {{MenuCommand|Coarse}}
** {{MenuCommand|Moderate}}
** {{MenuCommand|Fine}}
** {{MenuCommand|Very fine}}
** {{MenuCommand|User defined}}: for this option the following settings can be specified:
*** {{MenuCommand|Mesh size grading}}: a smaller value results in a finer mesh. The value must be in the {{Value|0.1}} - {{Value|1.0}} range.
*** {{MenuCommand|Element per edge}}: a larger value results in a finer mesh. The value must be in the {{Value|0.2}} - {{Value|10.0}} range.
*** {{MenuCommand|Element per curvature radius}}: a larger value results in a finer mesh. The value must be in the {{Value|0.2}} - {{Value|10}} range.
*{{MenuCommand|Optimize surface}}: if checked, the surface shape will be optimized.
*{{MenuCommand|Second order elements}}: if checked, second order elements will be generated resulting in a finer mesh.
*{{MenuCommand|Quad dominated}}: if checked, the mesh will preferably use [https://en.wikipedia.org/wiki/Types_of_mesh#Two-dimensional quadrilateral faces].


===Gmsh mesher===
You can choose between mesh {{MenuCommand|Fineness }} being:
*{{MenuCommand|Very coarse}}
*{{MenuCommand|Coarse}}
*{{MenuCommand|Moderate}}
*{{MenuCommand|Fine}}
*{{MenuCommand|Very fine}}
*{{MenuCommand|User defined}}
:For this you can set these values:
:{{MenuCommand|Mesh size grading}}: If this parameter is smaller, the mesh becomes finer. A value in the range of 0.1-1.
:{{MenuCommand|Element per edge}}: If this parameter is larger, the mesh becomes finer. A value in the range of 0.2-10.
:{{MenuCommand|Element per curvature radius}}: If this parameter is larger, the mesh becomes finer. A value in the range of 0.2-10.


For Linux users: the external [https://gmsh.info/ Gmsh] module is required.
For every {{MenuCommand|Fineness}} you can also choose:
*{{MenuCommand|Optimize surface}}: Whether an optimization of surface shape will be done.
*{{MenuCommand|Second order elements}}: Whether second order elements will be generated.
*{{MenuCommand|Quad dominated}}: Whether meshes will be arranged preferably using [https://en.wikipedia.org/wiki/Types_of_mesh#Two-dimensional quadrilateral faces].


* {{MenuCommand|Meshing}}: select a meshing option:
== Scripting ==
** {{MenuCommand|Automatic}}
** {{MenuCommand|Adaptive}}
** {{MenuCommand|Delaunay}}
** {{MenuCommand|Frontal}}
** {{MenuCommand|BAMG}}
** {{MenuCommand|Frontal Quad}}
** {{MenuCommand|Parallelograms}}
* {{MenuCommand|Max. element size}}: a smaller value results in a finer mesh. Specify {{Value|0}} to have this size automatically determined.
* {{MenuCommand|Min. element size}}: a smaller value results in a finer mesh. The value should be smaller than the {{MenuCommand|Max. element size}}. Specify {{Value|0}} to have this size automatically determined.
* {{MenuCommand|Angle}}: seems to be unsupported at this time.
* {{MenuCommand|Path}}: press the {{Button|...}} button and browse to the {{FileName|gmsh.exe}} path.
* If the meshing process takes too long you can press the {{Button|Kill}} button to abort it.
* Press the {{Button|Clear}} button to remove the information in the text area. <!--Because the task panel closes the Clear button cannot be used with this command. But the same task panel is used for the Mesh_RemeshGmsh command-->


==Notes==
This tool can be used in [[macros|macros]] and from the [[Python|Python]] console by using the following function:

{{Code|code=
* This command is not restricted to objects created with the [[Part_Workbench|Part workbench]]. It can create a mesh from any object that has a shape including objects created with the [[PartDesign_Workbench|PartDesign workbench]].
MeshPart.meshFromShape(Shape=Shape, MaxLength=520)
* The [[Std_Export|Std Export]] command can export shape objects directly to a mesh format.
}}
* See also: [[Export_to_STL_or_OBJ|Export to STL or OBJ]] tutorial.

==Preferences==

===Standard mesher===

* The {{MenuCommand|Surface deviation}} setting is stored: {{MenuCommand|Tools → Edit parameters... → BaseApp → Preferences → Mod → Mesh → Meshing → Standard → LinearDeflection}}.
* The {{MenuCommand|Angular deviation}} setting is stored: {{MenuCommand|Tools → Edit parameters... → BaseApp → Preferences → Mod → Mesh → Meshing → Standard → AngularDeflection}}.
* The {{MenuCommand|Relative surface deviation}} setting is stored: {{MenuCommand|Tools → Edit parameters... → BaseApp → Preferences → Mod → Mesh → Meshing → Standard → RelativeLinearDeflection}}.

===Gmsh mesher===

* The {{MenuCommand|Path}} is stored: {{MenuCommand|Tools → Edit parameters... → BaseApp → Preferences → Mod → Mesh → Meshing → gmshExe}}.

==Properties==

See: [[Mesh_Feature|Mesh Feature]].

==Scripting==

See also: [[FreeCAD_Scripting_Basics|FreeCAD Scripting Basics]].

To create a mesh object from a shape object use the {{incode|meshFromShape}} method of the MeshPart module. This method has several signatures. The signature determines the mesher that will be used. The example below uses the Mefisto mesher signature.


Example:
{{Code|code=
{{Code|code=
import FreeCAD, Draft, Arch, Mesh, MeshPart
import FreeCAD, Part, Mesh, MeshPart


cyl = FreeCAD.ActiveDocument.addObject("Part::Cylinder","Cylinder")
Line = Draft.makeWire([FreeCAD.Vector(0, 0, 0),FreeCAD.Vector(2000, 2000, 0)])
Wall = Arch.makeWall(Line, width=150, height=3000)
FreeCAD.ActiveDocument.recompute()
FreeCAD.ActiveDocument.recompute()


msh = FreeCAD.ActiveDocument.addObject("Mesh::Feature", "Mesh")
Shape = Wall.Shape.copy(False)
msh.Mesh = MeshPart.meshFromShape(Shape=cyl.Shape, MaxLength=1)
Shape.Placement = Wall.getGlobalPlacement()
msh.ViewObject.DisplayMode = "Flat Lines"

mesh_obj = FreeCAD.ActiveDocument.addObject("Mesh::Feature", "Mesh")
mesh_obj.Mesh = MeshPart.meshFromShape(Shape=Shape, MaxLength=520)
mesh_obj.ViewObject.DisplayMode = "Flat Lines"
}}
}}


==Notes==
* Tutorial: [[Export_to_STL_or_OBJ|Export_to_STL_or_OBJ]]


{{Docnav
{{Docnav|[[Mesh Export|Export Mesh]]|[[Mesh CurvaturePlot|Curvature Plot]]|[[Mesh_Workbench|Mesh]]|IconL=Mesh_ExportMesh.png|IconC=Workbench_Mesh.svg|IconR=Mesh_CurvaturePlot.png}}
|[[Mesh_Export|Export]]

|[[Mesh_RemeshGmsh|RemeshGmsh]]
{{Mesh Tools navi}}
|[[Mesh_Workbench|Mesh]]
|IconL=Mesh_Export.svg
|IconR=Mesh_RemeshGmsh.svg
|IconC=Workbench_Mesh.svg
}}


{{Mesh Tools navi{{#translation:}}}}
{{Userdocnavi}}
{{Userdocnavi{{#translation:}}}}
{{clear}}

Latest revision as of 15:58, 20 May 2023

Other languages:

Mesh FromPartShape

Menu location
Meshes → Create Mesh from Shape
Workbenches
Mesh
Default shortcut
None
Introduced in version
-
See also
None

Description

Introducere

Această comandă creează o plasă dintr-un obiect tip formă.

The inverse operation is Part ShapeFromMesh from the Part Workbench.

Utilizare

  1. Selectați obiectul de tip formă.
  2. Alegeți Meshes → Create Mesh from shape... din meniul principal.
  3. Un meniu va cere utilizarea mesher-ului/tessellation și valorile corespunzătoare pentru mesher


Doar selectând Meshes → Create Mesh from shape... vă va oferi un meniu suplimentar pentru a vă alege forma de transformat în plasă

Limitări



Abaterea de suprafață: Dacă acest număr este mai mic, ochiul devine mai fin. Valoarea cea mai mică este de 0,001.

Puteți alege între plase fiind:

  • Foarte grosieră
  • Grosieră
  • Moderat
  • Fină
  • Foarte fină
  • Definită de utilizator


Pentru ca Mesh fiind "definit de utilizator", puteți seta aceste valori:

    • Clasificarea dimensiunii ochiului: Dacă acest parametru este mai mic, ochiul devine mai fin. O valoare cuprinsă între 0,1 și 10.
    • Element per muchie/edge: Dacă acest parametru este mai mare, ochiul devine mai fin. O valoare cuprinsă între 0,1 și 10.
    • Element pe raza de curbură: Dacă acest parametru este mai mare, ochiul devine mai fin. O valoare cuprinsă între 0,1 și 10.


Pentru fiecare opțiune principală puteți de asemenea să alegeți:

  • Optimizați suprafața: dacă va fi făcută optimizarea formei suprafeței.
  • Elemente de ordine al doilea: Fie elementele de ordinul doi vor fi generate.
  • Quad dominantă: Dacă ochiurile vor fi aranjate ca hexahedral.

Mefisto Mesher

Netgen Mesher

  • Fineness: select an options for the finesse of the mesh:
    • Very coarse
    • Coarse
    • Moderate
    • Fine
    • Very fine
    • User defined: for this option the following settings can be specified:
      • Mesh size grading: a smaller value results in a finer mesh. The value must be in the 0.1 - 1.0 range.
      • Element per edge: a larger value results in a finer mesh. The value must be in the 0.2 - 10.0 range.
      • Element per curvature radius: a larger value results in a finer mesh. The value must be in the 0.2 - 10 range.
  • Optimize surface: if checked, the surface shape will be optimized.
  • Second order elements: if checked, second order elements will be generated resulting in a finer mesh.
  • Quad dominated: if checked, the mesh will preferably use quadrilateral faces.

Gmsh mesher

For Linux users: the external Gmsh module is required.

  • Meshing: select a meshing option:
    • Automatic
    • Adaptive
    • Delaunay
    • Frontal
    • BAMG
    • Frontal Quad
    • Parallelograms
  • Max. element size: a smaller value results in a finer mesh. Specify 0 to have this size automatically determined.
  • Min. element size: a smaller value results in a finer mesh. The value should be smaller than the Max. element size. Specify 0 to have this size automatically determined.
  • Angle: seems to be unsupported at this time.
  • Path: press the ... button and browse to the gmsh.exe path.
  • If the meshing process takes too long you can press the Kill button to abort it.
  • Press the Clear button to remove the information in the text area.

Notes

Preferences

Standard mesher

  • The Surface deviation setting is stored: Tools → Edit parameters... → BaseApp → Preferences → Mod → Mesh → Meshing → Standard → LinearDeflection.
  • The Angular deviation setting is stored: Tools → Edit parameters... → BaseApp → Preferences → Mod → Mesh → Meshing → Standard → AngularDeflection.
  • The Relative surface deviation setting is stored: Tools → Edit parameters... → BaseApp → Preferences → Mod → Mesh → Meshing → Standard → RelativeLinearDeflection.

Gmsh mesher

  • The Path is stored: Tools → Edit parameters... → BaseApp → Preferences → Mod → Mesh → Meshing → gmshExe.

Properties

See: Mesh Feature.

Scripting

See also: FreeCAD Scripting Basics.

To create a mesh object from a shape object use the meshFromShape method of the MeshPart module. This method has several signatures. The signature determines the mesher that will be used. The example below uses the Mefisto mesher signature. 

import FreeCAD, Part, Mesh, MeshPart

cyl = FreeCAD.ActiveDocument.addObject("Part::Cylinder","Cylinder")
FreeCAD.ActiveDocument.recompute()

msh = FreeCAD.ActiveDocument.addObject("Mesh::Feature", "Mesh")
msh.Mesh = MeshPart.meshFromShape(Shape=cyl.Shape, MaxLength=1)
msh.ViewObject.DisplayMode = "Flat Lines"


Mesh
User documentation
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