FE Mesh Quality Visualization - Revision history

Clisle at 19:31, 13 February 2007

2007-02-13T19:31:34Z

Clisle at 19:30, 13 February 2007

2007-02-13T19:30:46Z

Clisle at 18:00, 13 February 2007

2007-02-13T18:00:37Z

Clisle at 17:56, 13 February 2007

2007-02-13T17:56:24Z

Clisle at 17:55, 13 February 2007

2007-02-13T17:55:07Z

Clisle at 17:48, 13 February 2007

2007-02-13T17:48:59Z

Clisle at 16:02, 4 January 2007

2007-01-04T16:02:02Z

Clisle at 15:52, 4 January 2007

2007-01-04T15:52:48Z

Clisle at 14:51, 3 January 2007

2007-01-03T14:51:55Z

Clisle at 14:45, 3 January 2007

2007-01-03T14:45:49Z

← Older revision		Revision as of 19:31, 13 February 2007
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	To exercise the API for the FE Mesh Quality filter, a sample application is being developed using KWWidgets. The application allows class methods to be invoked through the controls on the left. This application also serves as a simplified way to learn the API interface to KWWidgets for others in our project later on.		To exercise the API for the FE Mesh Quality filter, a sample application is being developed using KWWidgets. The application allows class methods to be invoked through the controls on the left. This application also serves as a simplified way to learn the API interface to KWWidgets for others in our project later on.

−	[[Image: mesh-quality-viewer-021307.png]]	+	[[Image: mesh-quality-viewer-021307.png\|left\|thumb\|]]

← Older revision		Revision as of 19:30, 13 February 2007
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	It can be observed through inspection that some tests assign lower values to "poor" quality elements while other tests assign higher values to "poor" quality elements. Because of this inconsistency between algorithms, a normalization strategy is incorporated into the FE Mesh Quality Viewer along with attention paid to color table mapping, so that consistent coloring schemes are applied and displayed regardless of the mesh quality test selected by the user.		It can be observed through inspection that some tests assign lower values to "poor" quality elements while other tests assign higher values to "poor" quality elements. Because of this inconsistency between algorithms, a normalization strategy is incorporated into the FE Mesh Quality Viewer along with attention paid to color table mapping, so that consistent coloring schemes are applied and displayed regardless of the mesh quality test selected by the user.
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		+	''' Mesh Quality Viewer Application '''
		+
		+	To exercise the API for the FE Mesh Quality filter, a sample application is being developed using KWWidgets. The application allows class methods to be invoked through the controls on the left. This application also serves as a simplified way to learn the API interface to KWWidgets for others in our project later on.
		+
		+	[[Image: mesh-quality-viewer-021307.png]]

@@ Line 11: / Line 11: @@
-[[Image:hexQual1-Dec06small.jpg]]
+[[Image:hexQual1-Dec06small.jpg]]   [[Image:hexQual5-Dec06small.png]]
@@ Line 28: / Line 25: @@
 '''Comparing the Metrics in the VTK Mesh Quality Filter'''
 In December 2006 (VTK 5.1), the vtkMeshQualityFilter was updated to reference the Verdict external library for mesh quality computations developed by Sandia National Labs.   Verdict includes a very complete list of tests to be applied to mesh element types (hexahedral, tetrahedral, quad, tris, etc.).  To understand which metrics will be the most useful for our project, we selected several boundary elements from a finger bone dataset which had varying degrees of distortion and created the following visual inspection results.
 [[Image:jacobian.png]]                   [[Image:edge-ratio.png]]
@@ Line 38: / Line 37: @@
-{{Image:frobenius-med.png]]        [[Image:frobenius-max.png]]
+[[Image:frobenius-med.png]]        [[Image:frobenius-max.png]]
 [[Image:volume-021207.png]]

@@ Line 30: / Line 30: @@
 In December 2006 (VTK 5.1), the vtkMeshQualityFilter was updated to reference the Verdict external library for mesh quality computations developed by Sandia National Labs.   Verdict includes a very complete list of tests to be applied to mesh element types (hexahedral, tetrahedral, quad, tris, etc.).  To understand which metrics will be the most useful for our project, we selected several boundary elements from a finger bone dataset which had varying degrees of distortion and created the following visual inspection results.
-[[Image:jacobian.png]]             [[Image:edge-ratio.png]]
+[[Image:jacobian.png]]                   [[Image:edge-ratio.png]]
@@ Line 37: / Line 38: @@
-{{Image:
+{{Image:frobenius-med.png]]        [[Image:frobenius-max.png]]

@@ Line 30: / Line 30: @@
 In December 2006 (VTK 5.1), the vtkMeshQualityFilter was updated to reference the Verdict external library for mesh quality computations developed by Sandia National Labs.   Verdict includes a very complete list of tests to be applied to mesh element types (hexahedral, tetrahedral, quad, tris, etc.).  To understand which metrics will be the most useful for our project, we selected several boundary elements from a finger bone dataset which had varying degrees of distortion and created the following visual inspection results.
-[[Image:jacobian.png]]
+[[Image:jacobian.png]]             [[Image:edge-ratio.png]]
-[[Image:edge-ratio.png]]

← Older revision		Revision as of 17:48, 13 February 2007
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	[[Image:fe-thresh.png]]		[[Image:fe-thresh.png]]
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		+	'''Comparing the Metrics in the VTK Mesh Quality Filter'''
		+
		+	In December 2006 (VTK 5.1), the vtkMeshQualityFilter was updated to reference the Verdict external library for mesh quality computations developed by Sandia National Labs. Verdict includes a very complete list of tests to be applied to mesh element types (hexahedral, tetrahedral, quad, tris, etc.). To understand which metrics will be the most useful for our project, we selected several boundary elements from a finger bone dataset which had varying degrees of distortion and created the following visual inspection results.
		+
		+	[[Image:jacobian.png]]
		+
		+	[[Image:edge-ratio.png]]

← Older revision		Revision as of 16:02, 4 January 2007
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	'''Selecting Elements by Threshold Value'''		'''Selecting Elements by Threshold Value'''

−	Because of the large number of elements in a mesh, it is useful to display only certain elements. We provide for this by ~~allowing~~ a threshold value to enable the display of only ~~selected~~ elements. The per element quality value attached to each element is used to determine whether the element should be rendered or not.	+	Because of the large number of elements in a mesh, it is useful to display only certain elements. We provide for this by using a threshold value to enable the display of only "interesting" elements. The per element quality value attached to each element is used to determine whether the particular element should be rendered or not. Below is a sample image where only elements of lower quality are rendered. Notice that these elements lie entirely on the mesh boundaries.
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		+	[[Image:fe-thresh.png]]

← Older revision		Revision as of 15:52, 4 January 2007
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	[[Image:hexQual5-Dec06small.png]]		[[Image:hexQual5-Dec06small.png]]
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		+
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		+	'''Selecting Elements by Threshold Value'''
		+
		+	Because of the large number of elements in a mesh, it is useful to display only certain elements. We provide for this by allowing a threshold value to enable the display of only selected elements. The per element quality value attached to each element is used to determine whether the element should be rendered or not.

← Older revision		Revision as of 14:51, 3 January 2007
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−	[[Image:hexQual1-Dec06small.~~png~~]]	+	[[Image:hexQual1-Dec06small.jpg]]



	[[Image:hexQual5-Dec06small.png]]		[[Image:hexQual5-Dec06small.png]]

@@ Line 8: / Line 8: @@
 '''Rendering Techniques'''
-The mesh quality filter adds floating point "quality" values to each VTK cell in the mesh dataset.  There is a one-to-one correspondence between mesh elements and cells in a vtkUnstructuredGrid object.   Several techniques are planned for the visualization tools constructed by this project, including dynamic element sizing and thresholding elements above an adjustable quality value.  In the example shown here, each element is reduced in size, yet keeps its aspect ratio.  Each element is colored according to its individual quality value.
+The mesh quality filter adds floating point "quality" values to each VTK cell in the mesh dataset.  There is a one-to-one correspondence between mesh elements and cells in a vtkUnstructuredGrid object.   Several techniques are planned for the visualization tools constructed by this project, including dynamic element sizing and thresholding elements above an adjustable quality value.  In the examples shown here, each element is reduced in size, yet keeps its aspect ratio.  Each element is colored according to its individual quality value.
-[[Image:hexQual4 - Dec06.png]]