Create a Mesh with Images and Shapes - Revision history

Nairnj: /* Image and Shape Commands */

2016-12-06T03:31:57Z

Image and Shape Commands

← Older revision		Revision as of 03:31, 6 December 2016
Line 22:		Line 22:
	* [[FEA Region and Hole Commands\|Hole Command]]: Remove elements using a series of shape commands.		* [[FEA Region and Hole Commands\|Hole Command]]: Remove elements using a series of shape commands.
	* [[BMPRegion Command\|BMPRegion Command]]: Generate elements using a 2D image or CAD drawing of an object.		* [[BMPRegion Command\|BMPRegion Command]]: Generate elements using a 2D image or CAD drawing of an object.

	~~===Nested Shape Commands ===~~

	By [[Nested Shapes\|nesting shapes]], you can create many more types of shapes.		By [[Nested Shapes\|nesting shapes]], you can create many more types of shapes.

Nairnj: /* Image and Shape Commands */

2016-12-06T03:26:21Z

Image and Shape Commands

← Older revision		Revision as of 03:26, 6 December 2016
Line 22:		Line 22:
	* [[FEA Region and Hole Commands\|Hole Command]]: Remove elements using a series of shape commands.		* [[FEA Region and Hole Commands\|Hole Command]]: Remove elements using a series of shape commands.
	* [[BMPRegion Command\|BMPRegion Command]]: Generate elements using a 2D image or CAD drawing of an object.		* [[BMPRegion Command\|BMPRegion Command]]: Generate elements using a 2D image or CAD drawing of an object.

			===Nested Shape Commands ===

			By [[Nested Shapes\|nesting shapes]], you can create many more types of shapes.

Nairnj: /* Procedure */

2014-01-05T22:06:28Z

Procedure

← Older revision		Revision as of 22:06, 5 January 2014
Line 9:		Line 9:
	<li>Create a standard mesh, which can be done by [[FEA Mesh Generation Commands\|generating]] or [[Explicit FEA Mesh Generation\|explicitly defining]] a mesh. Each area (in [[FEA Mesh Generation Commands\|generated]] meshes) or element (in [[Explicit FEA Mesh Generation\|explicitly defined]] meshes) can be assigned to various materials. For sections of the mesh that will be set from image or shape commands, set the material <tt>id</tt> in the [[Area Command]] to <tt>_NONE_</tt> or the <tt>mat</tt> attribute of <tt>XML</tt> commands to 0. The material will be determined later by subsequent image and shape commands.</li>		<li>Create a standard mesh, which can be done by [[FEA Mesh Generation Commands\|generating]] or [[Explicit FEA Mesh Generation\|explicitly defining]] a mesh. Each area (in [[FEA Mesh Generation Commands\|generated]] meshes) or element (in [[Explicit FEA Mesh Generation\|explicitly defined]] meshes) can be assigned to various materials. For sections of the mesh that will be set from image or shape commands, set the material <tt>id</tt> in the [[Area Command]] to <tt>_NONE_</tt> or the <tt>mat</tt> attribute of <tt>XML</tt> commands to 0. The material will be determined later by subsequent image and shape commands.</li>

	<li>Once the initial mesh is ready, use one or more interspersed [[~~FEA~~ BMPRegion Command\|BMPRegion]], [[FEA Region and Hole Commands\|Region, or Hole]], commands (in <tt>XML</tt> files, the corresponing commands are [[~~FEA~~ BMPRegion Command\|<tt><BMP></tt>]], [[FEA Region and Hole Commands\|<tt><Body></tt>, or <tt><Hole></tt>]] commands). These commands will map elements covered by the image or by shapes to the material (or hole) associated with the command. The grid can be regular or irregular. The assignment will be determined by comparing the centroid of the element to the same location in an image or to see if it is contained in a shape. To resolve complicated structures, the grid has to be fine enough to resolve material boundaries.</li>		<li>Once the initial mesh is ready, use one or more interspersed [[BMPRegion Command\|BMPRegion]], [[FEA Region and Hole Commands\|Region, or Hole]], commands (in <tt>XML</tt> files, the corresponing commands are [[BMPRegion Command\|<tt><BMP></tt>]], [[FEA Region and Hole Commands\|<tt><Body></tt>, or <tt><Hole></tt>]] commands). These commands will map elements covered by the image or by shapes to the material (or hole) associated with the command. The grid can be regular or irregular. The assignment will be determined by comparing the centroid of the element to the same location in an image or to see if it is contained in a shape. To resolve complicated structures, the grid has to be fine enough to resolve material boundaries.</li>

	<li>When the mesh is done, any elements initialized to <tt>_NONE_</tt> (or <tt>mat=0</tt>) but not assigned to a material by an image or shape command will automatically be removed from the mesh. This feature allows calculations on materials with voids or irregular edges without needing to use complicated [[Area Command\|Area commands]] to construct the shape. If these removals cause the mesh to be partitioned into disconnected sections, however, the FEA analysis will fail. A good way to verify connectivity is to attempt to [[Resequence Command\|resequence the nodes]].</li>		<li>When the mesh is done, any elements initialized to <tt>_NONE_</tt> (or <tt>mat=0</tt>) but not assigned to a material by an image or shape command will automatically be removed from the mesh. This feature allows calculations on materials with voids or irregular edges without needing to use complicated [[Area Command\|Area commands]] to construct the shape. If these removals cause the mesh to be partitioned into disconnected sections, however, the FEA analysis will fail. A good way to verify connectivity is to attempt to [[Resequence Command\|resequence the nodes]].</li>

Nairnj: /* Image and Shape Commands */

2014-01-01T18:17:05Z

Image and Shape Commands

← Older revision		Revision as of 18:17, 1 January 2014
Line 21:		Line 21:
	* [[FEA Region and Hole Commands\|Region Command]]: Generate elements using a series of shape commands.		* [[FEA Region and Hole Commands\|Region Command]]: Generate elements using a series of shape commands.
	* [[FEA Region and Hole Commands\|Hole Command]]: Remove elements using a series of shape commands.		* [[FEA Region and Hole Commands\|Hole Command]]: Remove elements using a series of shape commands.
	* [[~~FEA~~ BMPRegion Command\|BMPRegion Command]]: Generate elements using a 2D image or CAD drawing of an object.		* [[BMPRegion Command\|BMPRegion Command]]: Generate elements using a 2D image or CAD drawing of an object.

Nairnj: /* Introduction */

2013-12-07T17:37:28Z

Introduction

← Older revision		Revision as of 17:37, 7 December 2013
Line 1:		Line 1:
	One way to create a complicated FEA mesh, especially composite materials with complex structures of subelements, is to define them with image and shape commands.		One way to create a complicated FEA mesh, especially composite materials with complex structures of subelements, is to define them with image and shape commands.
	__TOC__		__TOC__
	== ~~Introduction~~ ==		== Procedure ==

	An advanced method for creating FEA meshes is to create them using image and shape commands. The procedure for using this method is:		An advanced method for creating FEA meshes is to create them using image and shape commands. The procedure for using this method is:

Nairnj at 17:37, 7 December 2013

2013-12-07T17:37:06Z

← Older revision		Revision as of 17:37, 7 December 2013
Line 9:		Line 9:
	<li>Create a standard mesh, which can be done by [[FEA Mesh Generation Commands\|generating]] or [[Explicit FEA Mesh Generation\|explicitly defining]] a mesh. Each area (in [[FEA Mesh Generation Commands\|generated]] meshes) or element (in [[Explicit FEA Mesh Generation\|explicitly defined]] meshes) can be assigned to various materials. For sections of the mesh that will be set from image or shape commands, set the material <tt>id</tt> in the [[Area Command]] to <tt>_NONE_</tt> or the <tt>mat</tt> attribute of <tt>XML</tt> commands to 0. The material will be determined later by subsequent image and shape commands.</li>		<li>Create a standard mesh, which can be done by [[FEA Mesh Generation Commands\|generating]] or [[Explicit FEA Mesh Generation\|explicitly defining]] a mesh. Each area (in [[FEA Mesh Generation Commands\|generated]] meshes) or element (in [[Explicit FEA Mesh Generation\|explicitly defined]] meshes) can be assigned to various materials. For sections of the mesh that will be set from image or shape commands, set the material <tt>id</tt> in the [[Area Command]] to <tt>_NONE_</tt> or the <tt>mat</tt> attribute of <tt>XML</tt> commands to 0. The material will be determined later by subsequent image and shape commands.</li>

	<li>Once the initial mesh is ready, use one or more interspersed [[BMPRegion Command\|BMPRegion]], [[FEA Region and Hole Commands\|Region, or Hole]], commands (in <tt>XML</tt> files, the corresponing commands are [[BMPRegion Command\|<tt><BMP></tt>]], [[FEA Region and Hole Commands\|<tt><Body></tt>, or <tt><Hole></tt>]] commands). These commands will map elements covered by the image or by shapes to the material (or hole) associated with the command. The grid can be regular or irregular. The assignment will be determined by comparing the centroid of the element to the same location in an image or to see if it is contained in a shape. To resolve complicated structures, the grid has to be fine enough to resolve material boundaries.</li>		<li>Once the initial mesh is ready, use one or more interspersed [[FEA BMPRegion Command\|BMPRegion]], [[FEA Region and Hole Commands\|Region, or Hole]], commands (in <tt>XML</tt> files, the corresponing commands are [[FEA BMPRegion Command\|<tt><BMP></tt>]], [[FEA Region and Hole Commands\|<tt><Body></tt>, or <tt><Hole></tt>]] commands). These commands will map elements covered by the image or by shapes to the material (or hole) associated with the command. The grid can be regular or irregular. The assignment will be determined by comparing the centroid of the element to the same location in an image or to see if it is contained in a shape. To resolve complicated structures, the grid has to be fine enough to resolve material boundaries.</li>

	<li>When the mesh is done, any elements initialized to <tt>_NONE_</tt> (or <tt>mat=0</tt>) but not assigned to a material by an image or shape command will automatically be removed from the mesh. This feature allows calculations on materials with voids or irregular edges without needing to use complicated [[Area Command\|Area commands]] to construct the shape. If these removals cause the mesh to be partitioned into disconnected sections, however, the FEA analysis will fail. A good way to verify connectivity is to attempt to [[Resequence Command\|resequence the nodes]].</li>		<li>When the mesh is done, any elements initialized to <tt>_NONE_</tt> (or <tt>mat=0</tt>) but not assigned to a material by an image or shape command will automatically be removed from the mesh. This feature allows calculations on materials with voids or irregular edges without needing to use complicated [[Area Command\|Area commands]] to construct the shape. If these removals cause the mesh to be partitioned into disconnected sections, however, the FEA analysis will fail. A good way to verify connectivity is to attempt to [[Resequence Command\|resequence the nodes]].</li>
Line 15:		Line 15:
	</ol>		</ol>

	== ~~Using images~~ ==		== Image and Shape Commands ==

	~~An advanced feature of [[NairnFEA]] is that you can go directly from a digital image of an object or a CAD drawing to an FEA mesh. The command to handle this feature is the [[BMPRegion Command]].~~		To define the mesh using a series of geometric shapes or images, the the commands are

	~~== Using Shapes ==~~

	To define the mesh using a series of geometric shapes, the ~~two~~ commands are

	* [[FEA Region and Hole Commands\|Region Command]]: Generate elements using a series of shape commands.		* [[FEA Region and Hole Commands\|Region Command]]: Generate elements using a series of shape commands.
	* [[FEA Region and Hole Commands\|Hole Command]]: Remove elements using a series of shape commands.		* [[FEA Region and Hole Commands\|Hole Command]]: Remove elements using a series of shape commands.
			* [[FEA BMPRegion Command\|BMPRegion Command]]: Generate elements using a 2D image or CAD drawing of an object.

Nairnj: /* Introduction */

2013-09-13T20:01:18Z

Introduction

← Older revision		Revision as of 20:01, 13 September 2013
Line 9:		Line 9:
	<li>Create a standard mesh, which can be done by [[FEA Mesh Generation Commands\|generating]] or [[Explicit FEA Mesh Generation\|explicitly defining]] a mesh. Each area (in [[FEA Mesh Generation Commands\|generated]] meshes) or element (in [[Explicit FEA Mesh Generation\|explicitly defined]] meshes) can be assigned to various materials. For sections of the mesh that will be set from image or shape commands, set the material <tt>id</tt> in the [[Area Command]] to <tt>_NONE_</tt> or the <tt>mat</tt> attribute of <tt>XML</tt> commands to 0. The material will be determined later by subsequent image and shape commands.</li>		<li>Create a standard mesh, which can be done by [[FEA Mesh Generation Commands\|generating]] or [[Explicit FEA Mesh Generation\|explicitly defining]] a mesh. Each area (in [[FEA Mesh Generation Commands\|generated]] meshes) or element (in [[Explicit FEA Mesh Generation\|explicitly defined]] meshes) can be assigned to various materials. For sections of the mesh that will be set from image or shape commands, set the material <tt>id</tt> in the [[Area Command]] to <tt>_NONE_</tt> or the <tt>mat</tt> attribute of <tt>XML</tt> commands to 0. The material will be determined later by subsequent image and shape commands.</li>

	<li>Once the initial mesh is ready, use one or more interspersed [[BMPRegion Command\|BMPRegion]], [[FEA Region or Hole Commands\|Region, or Hole]], commands (in <tt>XML</tt> files, the corresponing commands are [[BMPRegion Command\|<tt><BMP></tt>]], [[Region ~~Command~~\|<tt><Body></tt>]], or ~~[[Hole Command\|~~<tt><Hole></tt>]] commands). These commands will map elements covered by the image or by shapes to the material associated with the command. The grid can be regular or irregular. The ~~material~~ will be ~~selected~~ by comparing the centroid of the element to the same location in an image or to see if it is contained in a shape. To resolve complicated structures, the grid has to be fine enough to resolve material boundaries.</li>		<li>Once the initial mesh is ready, use one or more interspersed [[BMPRegion Command\|BMPRegion]], [[FEA Region and Hole Commands\|Region, or Hole]], commands (in <tt>XML</tt> files, the corresponing commands are [[BMPRegion Command\|<tt><BMP></tt>]], [[FEA Region and Hole Commands\|<tt><Body></tt>, or <tt><Hole></tt>]] commands). These commands will map elements covered by the image or by shapes to the material (or hole) associated with the command. The grid can be regular or irregular. The assignment will be determined by comparing the centroid of the element to the same location in an image or to see if it is contained in a shape. To resolve complicated structures, the grid has to be fine enough to resolve material boundaries.</li>

	<li>When the mesh is done, any elements initialized to <tt>_NONE_</tt> (or <tt>mat=0</tt>) but not assigned to a material by an image or shape command will automatically be removed from the mesh. This feature allows calculations on materials with voids or irregular edges without needing to use complicated [[Area Command\|Area commands]] to construct the shape. If these removals cause the mesh to be partitioned into disconnected sections, however, the FEA analysis will fail. A good way to verify connectivity is to attempt to [[Resequence Command\|resequence the nodes]].</li>		<li>When the mesh is done, any elements initialized to <tt>_NONE_</tt> (or <tt>mat=0</tt>) but not assigned to a material by an image or shape command will automatically be removed from the mesh. This feature allows calculations on materials with voids or irregular edges without needing to use complicated [[Area Command\|Area commands]] to construct the shape. If these removals cause the mesh to be partitioned into disconnected sections, however, the FEA analysis will fail. A good way to verify connectivity is to attempt to [[Resequence Command\|resequence the nodes]].</li>

Nairnj: /* Introduction */

2013-09-13T19:58:16Z

Introduction

← Older revision		Revision as of 19:58, 13 September 2013
Line 9:		Line 9:
	<li>Create a standard mesh, which can be done by [[FEA Mesh Generation Commands\|generating]] or [[Explicit FEA Mesh Generation\|explicitly defining]] a mesh. Each area (in [[FEA Mesh Generation Commands\|generated]] meshes) or element (in [[Explicit FEA Mesh Generation\|explicitly defined]] meshes) can be assigned to various materials. For sections of the mesh that will be set from image or shape commands, set the material <tt>id</tt> in the [[Area Command]] to <tt>_NONE_</tt> or the <tt>mat</tt> attribute of <tt>XML</tt> commands to 0. The material will be determined later by subsequent image and shape commands.</li>		<li>Create a standard mesh, which can be done by [[FEA Mesh Generation Commands\|generating]] or [[Explicit FEA Mesh Generation\|explicitly defining]] a mesh. Each area (in [[FEA Mesh Generation Commands\|generated]] meshes) or element (in [[Explicit FEA Mesh Generation\|explicitly defined]] meshes) can be assigned to various materials. For sections of the mesh that will be set from image or shape commands, set the material <tt>id</tt> in the [[Area Command]] to <tt>_NONE_</tt> or the <tt>mat</tt> attribute of <tt>XML</tt> commands to 0. The material will be determined later by subsequent image and shape commands.</li>

	<li>Once the initial mesh is ready, use one or more interspersed [[BMPRegion Command\|BMPRegion]], [[Region ~~Command~~\|Region]], or ~~[[Hole Command\|~~Hole]] commands (in <tt>XML</tt> files, the corresponing commands are [[BMPRegion Command\|<tt><BMP></tt>]], [[Region Command\|<tt><Body></tt>]], or [[Hole Command\|<tt><Hole></tt>]] commands). These commands will map elements covered by the image or by shapes to the material associated with the command. The grid can be regular or irregular. The material will be selected by comparing the centroid of the element to the same location in an image or to see if it is contained in a shape. To resolve complicated structures, the grid has to be fine enough to resolve material boundaries.</li>		<li>Once the initial mesh is ready, use one or more interspersed [[BMPRegion Command\|BMPRegion]], [[FEA Region or Hole Commands\|Region, or Hole]], commands (in <tt>XML</tt> files, the corresponing commands are [[BMPRegion Command\|<tt><BMP></tt>]], [[Region Command\|<tt><Body></tt>]], or [[Hole Command\|<tt><Hole></tt>]] commands). These commands will map elements covered by the image or by shapes to the material associated with the command. The grid can be regular or irregular. The material will be selected by comparing the centroid of the element to the same location in an image or to see if it is contained in a shape. To resolve complicated structures, the grid has to be fine enough to resolve material boundaries.</li>

	<li>When the mesh is done, any elements initialized to <tt>_NONE_</tt> (or <tt>mat=0</tt>) but not assigned to a material by an image or shape command will automatically be removed from the mesh. This feature allows calculations on materials with voids or irregular edges without needing to use complicated [[Area Command\|Area commands]] to construct the shape. If these removals cause the mesh to be partitioned into disconnected sections, however, the FEA analysis will fail. A good way to verify connectivity is to attempt to [[Resequence Command\|resequence the nodes]].</li>		<li>When the mesh is done, any elements initialized to <tt>_NONE_</tt> (or <tt>mat=0</tt>) but not assigned to a material by an image or shape command will automatically be removed from the mesh. This feature allows calculations on materials with voids or irregular edges without needing to use complicated [[Area Command\|Area commands]] to construct the shape. If these removals cause the mesh to be partitioned into disconnected sections, however, the FEA analysis will fail. A good way to verify connectivity is to attempt to [[Resequence Command\|resequence the nodes]].</li>

Nairnj: /* Using images */

2013-09-13T19:17:13Z

Using images

← Older revision		Revision as of 19:17, 13 September 2013
Line 17:		Line 17:
	== Using images ==		== Using images ==

	To go ~~direct~~ from digital ~~images~~ to an FEA mesh~~, you can use~~ the [[BMPRegion Command]].		An advanced feature of [[NairnFEA]] is that you can go directly from a digital image of an object or a CAD drawing to an FEA mesh. The command to handle this feature is the [[BMPRegion Command]].

	== Using Shapes ==		== Using Shapes ==

Nairnj: /* XML Images and Shapes */

2013-09-13T19:15:54Z

XML Images and Shapes

← Older revision		Revision as of 19:15, 13 September 2013
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	* [[FEA Region and Hole Commands\|Region Command]]: Generate elements using a series of shape commands.		* [[FEA Region and Hole Commands\|Region Command]]: Generate elements using a series of shape commands.
	* [[FEA Region and Hole Commands\|Hole Command]]: Remove elements using a series of shape commands.		* [[FEA Region and Hole Commands\|Hole Command]]: Remove elements using a series of shape commands.

	~~== XML Images and Shapes ==~~

	~~The main commands for creating a mesh from images and shapes in <tt>XML</tt> files are:~~

	* [[BMPRegion Command\|<tt><BMP></tt> Command]]: Generate elements from an image in a BMP file.
	* [[Region Command\|<tt><Body></tt> Command]]: Generate elements using a series of shape commands.
	* [[Hole Command\|<tt><Hole></tt> Command]]: Remove elements using a series of shape commands.

	~~The available 2D shapes for create FEA meshes are:~~

	* [[Rect Command\|<tt><Rect></tt> Command]]: Define rectangle to set element material type.
	* [[Oval Command\|<tt><Oval></tt> Command]]: Define oval to set element material type.
	* [[PolyPt Command\|<tt><PolyPt></tt> Command]]: Define polygon to set element material type

	~~<pre>~~
	~~<BMP name="MatImage.bmp" width="50" angles="MatAngles.bmp">~~
	~~<Origin x="0" y="0"/>~~
	~~<Intensity mat="2" imin="76" imax="255">~~
	~~<Thickness units="mm">1</Thickness>~~
	~~</Intensity>~~
	~~<Intensity mat="3" imin="1" imax="75">~~
	~~<Thickness units="mm">1</Thickness>~~
	~~</Intensity>~~
	~~<Intensity imin="0" imax="255" minAngle="0.000000" maxAngle="90.000000"/>~~
	~~</BMP>~~

	~~<Body mat='1' angle='0' thick='1'>~~
	~~<Oval units='mm' xmin='10' xmax='40' ymin='10' ymax='40'/>~~
	~~<Rect units='mm' xmin='10' xmax='40' ymin='10' ymax='40'/>~~
	~~</Body>~~

	~~<Hole>~~
	~~<Rect xmin='20' xmax='30' ymin='20' ymax='30'/>~~
	~~</Hole>~~
	~~</pre>~~

	~~The image and shape commands are:~~

	~~<dl>~~

	~~<dt><code><BMP></code></dt>~~
	~~<dd>The details on the <code><BMP></code> command and the meaning of its attributes and subordinate commands are given <a href="definempm.html#BMPShape">here</a> (in the MPM documentation).</dd>~~

	~~<dt><code><Body></code></dt>~~
	~~<dd>Defines a block of material. All material points in the block will be assigned the same material~~
	~~number (<code>mat</code>, see <a href="definematl.html">Defining Materials</a>;~~
	~~numbers can be replaced by names using a <code>matname</code> attribute~~
	~~as explained <a href="definematl.html#usemats">here</a>), material angle~~
	~~(<code>angle</code> in degrees which is used for some <a href="definematl.html">anisotropic~~
	~~materials</a>; t can be entered as a number or as a <a href="function.html">user-defined function</a>), and thickness (<code>thick</code> in mm)~~
	A single <code><Body></code> for 2D FEA can contain any number of the <a href="definempm.html#2DShapes">2D shape commands</a>. The shapes can overlap; if they do the element material will be for the first shape command that intersects that elements centroid.
	~~If not specified angle will be zero and the thickness will be 1 mm.</dd>~~

	~~<dt><code><Hole></code></dt>~~
	<dd>Defines empty space within a body. A single <code><Hole></code> group for 2D FEA can contain any number of the <a href="definempm.html#2DShapes">2D shape commands</a>. Any subsequent <code><BMP></code> or <code><Body></code> structures that overlap the hole will not assign those elements.</dd>

	~~</dl>~~

← Older revision		Revision as of 03:31, 6 December 2016
Line 22:		Line 22:
	* [[FEA Region and Hole Commands\|Hole Command]]: Remove elements using a series of shape commands.		* [[FEA Region and Hole Commands\|Hole Command]]: Remove elements using a series of shape commands.
	* [[BMPRegion Command\|BMPRegion Command]]: Generate elements using a 2D image or CAD drawing of an object.		* [[BMPRegion Command\|BMPRegion Command]]: Generate elements using a 2D image or CAD drawing of an object.

	~~===Nested Shape Commands ===~~

	By [[Nested Shapes\|nesting shapes]], you can create many more types of shapes.		By [[Nested Shapes\|nesting shapes]], you can create many more types of shapes.

← Older revision		Revision as of 22:06, 5 January 2014
Line 9:		Line 9:
	<li>Create a standard mesh, which can be done by [[FEA Mesh Generation Commands\|generating]] or [[Explicit FEA Mesh Generation\|explicitly defining]] a mesh. Each area (in [[FEA Mesh Generation Commands\|generated]] meshes) or element (in [[Explicit FEA Mesh Generation\|explicitly defined]] meshes) can be assigned to various materials. For sections of the mesh that will be set from image or shape commands, set the material <tt>id</tt> in the [[Area Command]] to <tt>_NONE_</tt> or the <tt>mat</tt> attribute of <tt>XML</tt> commands to 0. The material will be determined later by subsequent image and shape commands.</li>		<li>Create a standard mesh, which can be done by [[FEA Mesh Generation Commands\|generating]] or [[Explicit FEA Mesh Generation\|explicitly defining]] a mesh. Each area (in [[FEA Mesh Generation Commands\|generated]] meshes) or element (in [[Explicit FEA Mesh Generation\|explicitly defined]] meshes) can be assigned to various materials. For sections of the mesh that will be set from image or shape commands, set the material <tt>id</tt> in the [[Area Command]] to <tt>_NONE_</tt> or the <tt>mat</tt> attribute of <tt>XML</tt> commands to 0. The material will be determined later by subsequent image and shape commands.</li>

	<li>Once the initial mesh is ready, use one or more interspersed [[~~FEA~~ BMPRegion Command\|BMPRegion]], [[FEA Region and Hole Commands\|Region, or Hole]], commands (in <tt>XML</tt> files, the corresponing commands are [[~~FEA~~ BMPRegion Command\|<tt><BMP></tt>]], [[FEA Region and Hole Commands\|<tt><Body></tt>, or <tt><Hole></tt>]] commands). These commands will map elements covered by the image or by shapes to the material (or hole) associated with the command. The grid can be regular or irregular. The assignment will be determined by comparing the centroid of the element to the same location in an image or to see if it is contained in a shape. To resolve complicated structures, the grid has to be fine enough to resolve material boundaries.</li>		<li>Once the initial mesh is ready, use one or more interspersed [[BMPRegion Command\|BMPRegion]], [[FEA Region and Hole Commands\|Region, or Hole]], commands (in <tt>XML</tt> files, the corresponing commands are [[BMPRegion Command\|<tt><BMP></tt>]], [[FEA Region and Hole Commands\|<tt><Body></tt>, or <tt><Hole></tt>]] commands). These commands will map elements covered by the image or by shapes to the material (or hole) associated with the command. The grid can be regular or irregular. The assignment will be determined by comparing the centroid of the element to the same location in an image or to see if it is contained in a shape. To resolve complicated structures, the grid has to be fine enough to resolve material boundaries.</li>

	<li>When the mesh is done, any elements initialized to <tt>_NONE_</tt> (or <tt>mat=0</tt>) but not assigned to a material by an image or shape command will automatically be removed from the mesh. This feature allows calculations on materials with voids or irregular edges without needing to use complicated [[Area Command\|Area commands]] to construct the shape. If these removals cause the mesh to be partitioned into disconnected sections, however, the FEA analysis will fail. A good way to verify connectivity is to attempt to [[Resequence Command\|resequence the nodes]].</li>		<li>When the mesh is done, any elements initialized to <tt>_NONE_</tt> (or <tt>mat=0</tt>) but not assigned to a material by an image or shape command will automatically be removed from the mesh. This feature allows calculations on materials with voids or irregular edges without needing to use complicated [[Area Command\|Area commands]] to construct the shape. If these removals cause the mesh to be partitioned into disconnected sections, however, the FEA analysis will fail. A good way to verify connectivity is to attempt to [[Resequence Command\|resequence the nodes]].</li>

← Older revision		Revision as of 18:17, 1 January 2014
Line 21:		Line 21:
	* [[FEA Region and Hole Commands\|Region Command]]: Generate elements using a series of shape commands.		* [[FEA Region and Hole Commands\|Region Command]]: Generate elements using a series of shape commands.
	* [[FEA Region and Hole Commands\|Hole Command]]: Remove elements using a series of shape commands.		* [[FEA Region and Hole Commands\|Hole Command]]: Remove elements using a series of shape commands.
	* [[~~FEA~~ BMPRegion Command\|BMPRegion Command]]: Generate elements using a 2D image or CAD drawing of an object.		* [[BMPRegion Command\|BMPRegion Command]]: Generate elements using a 2D image or CAD drawing of an object.

← Older revision		Revision as of 20:01, 13 September 2013
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	<li>Create a standard mesh, which can be done by [[FEA Mesh Generation Commands\|generating]] or [[Explicit FEA Mesh Generation\|explicitly defining]] a mesh. Each area (in [[FEA Mesh Generation Commands\|generated]] meshes) or element (in [[Explicit FEA Mesh Generation\|explicitly defined]] meshes) can be assigned to various materials. For sections of the mesh that will be set from image or shape commands, set the material <tt>id</tt> in the [[Area Command]] to <tt>_NONE_</tt> or the <tt>mat</tt> attribute of <tt>XML</tt> commands to 0. The material will be determined later by subsequent image and shape commands.</li>		<li>Create a standard mesh, which can be done by [[FEA Mesh Generation Commands\|generating]] or [[Explicit FEA Mesh Generation\|explicitly defining]] a mesh. Each area (in [[FEA Mesh Generation Commands\|generated]] meshes) or element (in [[Explicit FEA Mesh Generation\|explicitly defined]] meshes) can be assigned to various materials. For sections of the mesh that will be set from image or shape commands, set the material <tt>id</tt> in the [[Area Command]] to <tt>_NONE_</tt> or the <tt>mat</tt> attribute of <tt>XML</tt> commands to 0. The material will be determined later by subsequent image and shape commands.</li>

	<li>Once the initial mesh is ready, use one or more interspersed [[BMPRegion Command\|BMPRegion]], [[FEA Region or Hole Commands\|Region, or Hole]], commands (in <tt>XML</tt> files, the corresponing commands are [[BMPRegion Command\|<tt><BMP></tt>]], [[Region ~~Command~~\|<tt><Body></tt>]], or ~~[[Hole Command\|~~<tt><Hole></tt>]] commands). These commands will map elements covered by the image or by shapes to the material associated with the command. The grid can be regular or irregular. The ~~material~~ will be ~~selected~~ by comparing the centroid of the element to the same location in an image or to see if it is contained in a shape. To resolve complicated structures, the grid has to be fine enough to resolve material boundaries.</li>		<li>Once the initial mesh is ready, use one or more interspersed [[BMPRegion Command\|BMPRegion]], [[FEA Region and Hole Commands\|Region, or Hole]], commands (in <tt>XML</tt> files, the corresponing commands are [[BMPRegion Command\|<tt><BMP></tt>]], [[FEA Region and Hole Commands\|<tt><Body></tt>, or <tt><Hole></tt>]] commands). These commands will map elements covered by the image or by shapes to the material (or hole) associated with the command. The grid can be regular or irregular. The assignment will be determined by comparing the centroid of the element to the same location in an image or to see if it is contained in a shape. To resolve complicated structures, the grid has to be fine enough to resolve material boundaries.</li>

	<li>When the mesh is done, any elements initialized to <tt>_NONE_</tt> (or <tt>mat=0</tt>) but not assigned to a material by an image or shape command will automatically be removed from the mesh. This feature allows calculations on materials with voids or irregular edges without needing to use complicated [[Area Command\|Area commands]] to construct the shape. If these removals cause the mesh to be partitioned into disconnected sections, however, the FEA analysis will fail. A good way to verify connectivity is to attempt to [[Resequence Command\|resequence the nodes]].</li>		<li>When the mesh is done, any elements initialized to <tt>_NONE_</tt> (or <tt>mat=0</tt>) but not assigned to a material by an image or shape command will automatically be removed from the mesh. This feature allows calculations on materials with voids or irregular edges without needing to use complicated [[Area Command\|Area commands]] to construct the shape. If these removals cause the mesh to be partitioned into disconnected sections, however, the FEA analysis will fail. A good way to verify connectivity is to attempt to [[Resequence Command\|resequence the nodes]].</li>

← Older revision		Revision as of 19:58, 13 September 2013
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	<li>Create a standard mesh, which can be done by [[FEA Mesh Generation Commands\|generating]] or [[Explicit FEA Mesh Generation\|explicitly defining]] a mesh. Each area (in [[FEA Mesh Generation Commands\|generated]] meshes) or element (in [[Explicit FEA Mesh Generation\|explicitly defined]] meshes) can be assigned to various materials. For sections of the mesh that will be set from image or shape commands, set the material <tt>id</tt> in the [[Area Command]] to <tt>_NONE_</tt> or the <tt>mat</tt> attribute of <tt>XML</tt> commands to 0. The material will be determined later by subsequent image and shape commands.</li>		<li>Create a standard mesh, which can be done by [[FEA Mesh Generation Commands\|generating]] or [[Explicit FEA Mesh Generation\|explicitly defining]] a mesh. Each area (in [[FEA Mesh Generation Commands\|generated]] meshes) or element (in [[Explicit FEA Mesh Generation\|explicitly defined]] meshes) can be assigned to various materials. For sections of the mesh that will be set from image or shape commands, set the material <tt>id</tt> in the [[Area Command]] to <tt>_NONE_</tt> or the <tt>mat</tt> attribute of <tt>XML</tt> commands to 0. The material will be determined later by subsequent image and shape commands.</li>

	<li>Once the initial mesh is ready, use one or more interspersed [[BMPRegion Command\|BMPRegion]], [[Region ~~Command~~\|Region]], or ~~[[Hole Command\|~~Hole]] commands (in <tt>XML</tt> files, the corresponing commands are [[BMPRegion Command\|<tt><BMP></tt>]], [[Region Command\|<tt><Body></tt>]], or [[Hole Command\|<tt><Hole></tt>]] commands). These commands will map elements covered by the image or by shapes to the material associated with the command. The grid can be regular or irregular. The material will be selected by comparing the centroid of the element to the same location in an image or to see if it is contained in a shape. To resolve complicated structures, the grid has to be fine enough to resolve material boundaries.</li>		<li>Once the initial mesh is ready, use one or more interspersed [[BMPRegion Command\|BMPRegion]], [[FEA Region or Hole Commands\|Region, or Hole]], commands (in <tt>XML</tt> files, the corresponing commands are [[BMPRegion Command\|<tt><BMP></tt>]], [[Region Command\|<tt><Body></tt>]], or [[Hole Command\|<tt><Hole></tt>]] commands). These commands will map elements covered by the image or by shapes to the material associated with the command. The grid can be regular or irregular. The material will be selected by comparing the centroid of the element to the same location in an image or to see if it is contained in a shape. To resolve complicated structures, the grid has to be fine enough to resolve material boundaries.</li>

	<li>When the mesh is done, any elements initialized to <tt>_NONE_</tt> (or <tt>mat=0</tt>) but not assigned to a material by an image or shape command will automatically be removed from the mesh. This feature allows calculations on materials with voids or irregular edges without needing to use complicated [[Area Command\|Area commands]] to construct the shape. If these removals cause the mesh to be partitioned into disconnected sections, however, the FEA analysis will fail. A good way to verify connectivity is to attempt to [[Resequence Command\|resequence the nodes]].</li>		<li>When the mesh is done, any elements initialized to <tt>_NONE_</tt> (or <tt>mat=0</tt>) but not assigned to a material by an image or shape command will automatically be removed from the mesh. This feature allows calculations on materials with voids or irregular edges without needing to use complicated [[Area Command\|Area commands]] to construct the shape. If these removals cause the mesh to be partitioned into disconnected sections, however, the FEA analysis will fail. A good way to verify connectivity is to attempt to [[Resequence Command\|resequence the nodes]].</li>