SciVisFall2007/Assignment 2 - Revision history

Cscheid at 20:45, 25 October 2007

2007-10-25T20:45:41Z

← Older revision		Revision as of 20:45, 25 October 2007
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	"stack" the right way. Use the "AddPosition" method on the vtkActor		"stack" the right way. Use the "AddPosition" method on the vtkActor
	module to do that.		module to do that.

			== FAQ ==

			See FAQ [[SciVisFall2007/Assignment_2/FAQ \| here]].

	== Data ==		== Data ==

Cscheid at 03:56, 17 October 2007

2007-10-17T03:56:58Z

← Older revision		Revision as of 03:56, 17 October 2007
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	The assignment is due at midnight on October ~~30th~~. You will need to		The assignment is due at midnight on October 25th. You will need to
	use the CADE handin functionality to turn in your assignment. The		use the CADE handin functionality to turn in your assignment. The
	class account is "cs5630".		class account is "cs5630".

Cscheid at 03:55, 17 October 2007

2007-10-17T03:55:14Z

← Older revision		Revision as of 03:55, 17 October 2007
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	The purpose of this assignment is to make sure you understand (and experiment with) the		The purpose of this assignment is to make sure you understand (and experiment with) the
	basic concepts involved in the visualization of 2D scalar and vector		basic concepts involved in the visualization of 2D scalar and vector
	fields. As you work on the assignment, we encourage ~~highly~~ you to read the available		fields. As you work on the assignment, we greatly encourage you to read the available
	documentation on both python and VTK. Some of the problems will require you to use VTK modules you might not have previously seen. These are indicated in the problems.		documentation on both python and VTK. Some of the problems will require you to use VTK modules you might not have previously seen. These are indicated in the problems.

Cscheid: /* Grads only */

2007-10-17T01:21:21Z

Grads only

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	vistrail we have provided you to create divergence and curl		vistrail we have provided you to create divergence and curl
	fields. It's OK to copy and paste these modules.		fields. It's OK to copy and paste these modules.

			=== Extra credit ===

			Try to generate a visualization that portrays both
			divergence and curl at the same time. There are (at least) two issues
			we want you to solve creatively here - occlusion and colormap
			interference. This is your chance to explore anything you might feel like doing.
			Here is a set of places to get you started: vtkProbeFilter, opacity values, vtk clipping algorithms, interactive visualizations (look up terminator.vt in the examples) Have fun!

Cscheid: /* Problem 2: Differential visualization in scalar fields */

2007-10-17T01:18:05Z

Problem 2: Differential visualization in scalar fields

← Older revision		Revision as of 01:18, 17 October 2007
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	portrays the mountain steepness without sacrificing the height		portrays the mountain steepness without sacrificing the height
	information. Potentially relevant modules: vtkContourFilter, vtkWarpVector.		information. Potentially relevant modules: vtkContourFilter, vtkWarpVector.


	=== Grads only ===		=== Grads only ===

Cscheid at 01:17, 17 October 2007

2007-10-17T01:17:54Z

Cscheid: /* General Hints */

2007-10-17T01:17:09Z

General Hints

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	documentation on both python and VTK. Some of the problems will require you to use VTK modules you might not have previously seen. These are indicated in the problems.		documentation on both python and VTK. Some of the problems will require you to use VTK modules you might not have previously seen. These are indicated in the problems.

	=== General Hints ===		== Submitting your vistrail ==

			You '''''do not''''' need to use assignment2.vt as a starting point for your solution. You are welcome to, but it's not necessary.


			=== Labelling your visualizations ===

			Your visualizations should be labeled "Problem 1a", "Problem 1b", "Problem 1c", "Problem 2a", etc.


			== General Hints ==

	Some of the fields in this assignment are such that most of		Some of the fields in this assignment are such that most of
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	"stack" the right way. Use the "AddPosition" method on the vtkActor		"stack" the right way. Use the "AddPosition" method on the vtkActor
	module to do that.		module to do that.


			== Data ==

			All the data you need is available at http://www.sci.utah.edu/~cscheid/scivis_fall07/assignment2/. These are:

			* [http://www.sci.utah.edu/~cscheid/scivis_fall07/assignment2/assignment2.vt assignment2.vt] Only necessary for grad students. Includes the PythonSource modules necessary for generating gradient, divergence and curl.
			* [http://www.sci.utah.edu/~cscheid/scivis_fall07/assignment2/honolulu.vtk honolulu.vtk] DEM of Honolulu, HI, around Pearl Harbor and Diamond Head Crater.
			* [http://www.sci.utah.edu/~cscheid/scivis_fall07/assignment2/honolulu_small.vtk honolulu_small.vtk] Downsampled version of above file. '''''You should probably test your visualzations with this file'''''. It is 1/16th of the size of honolulu.vtk, so it will work well on slower machines.
			* [http://www.sci.utah.edu/~cscheid/scivis_fall07/assignment2/vector_field.vtk vector_field.vtk] 2D vector field for Problems 3 and 4.
			* [http://www.sci.utah.edu/~cscheid/scivis_fall07/assignment2/vector_field.vtk vector_field.vtk] Normalized 2D vector field for Problems 3 and 4.

	== Problem 1: Basic scalar field techniques ==		== Problem 1: Basic scalar field techniques ==

Cscheid: /* Problem 4: Differential information in vector fields */

2007-10-17T01:09:16Z

Problem 4: Differential information in vector fields

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	== Problem 4: Differential information in vector fields ==		== Problem 4: Differential information in vector fields ==

			a. Generate a visualization that builds on 3b. and uses the background
			to portray the magnitude of the vectors in the field. Potentially
			relevant modules: vtkVectorNorm.

			=== Grads only ===

			b. Generate a visualization that portrays divergence, and one that
			portrays curl. Choose an appropriate colormap, and justify it in your
			notes. Use the PythonSource module from the
			"Divergence Generation" and "Curl Generation" visualizations in the
			vistrail we have provided you to create divergence and curl
			fields. It's OK to copy and paste these modules.

Cscheid: /* Problem 3: Basic vector field techniques */

2007-10-17T01:08:36Z

Problem 3: Basic vector field techniques

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	is extra fine).		is extra fine).

	Grads only		=== Grads only ===

	c. Generate a visualization of the gradients of the Honolulu DEM. Use		c. Generate a visualization of the gradients of the Honolulu DEM. Use

Cscheid: /* Problem 2: Differential visualization in scalar fields */

2007-10-17T01:08:25Z

Problem 2: Differential visualization in scalar fields

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	Grads only		=== Grads only ===

	c. The Pearl Harbor DEM is an example of a dataset where the natural		c. The Pearl Harbor DEM is an example of a dataset where the natural
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	out.		out.

	Extra credit		=== Extra credit ===

	d. Generate another visualization for problem 2b that uses a different technique.		d. Generate another visualization for problem 2b that uses a different technique.

← Older revision		Revision as of 01:17, 17 October 2007
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	== Submitting your vistrail ==		== Submitting your vistrail ==

	You '''''do not''''' need to use assignment2.vt as a starting point for your solution. You are welcome to, but it's not necessary.		You '''''do not''''' need to use assignment2.vt as a starting point for your solution. You are welcome to, but it's not necessary.


	=== Labelling your visualizations ===		=== Labelling your visualizations ===

	Your visualizations should be labeled "Problem 1a", "Problem 1b", "Problem 1c", "Problem 2a", etc.		Your visualizations should be labeled "Problem 1a", "Problem 1b", "Problem 1c", "Problem 2a", etc.


	== General Hints ==		== General Hints ==

	Some of the fields in this assignment are such that most of		Some of the fields in this assignment are such that most of
	the points in the field have values in a small region of the		the points in the field have values in a small region of the
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	"stack" the right way. Use the "AddPosition" method on the vtkActor		"stack" the right way. Use the "AddPosition" method on the vtkActor
	module to do that.		module to do that.


	== Data ==		== Data ==

	All the data you need is available at http://www.sci.utah.edu/~cscheid/scivis_fall07/assignment2/. These are:		All the data you need is available at http://www.sci.utah.edu/~cscheid/scivis_fall07/assignment2/. These are:

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	== Problem 1: Basic scalar field techniques ==		== Problem 1: Basic scalar field techniques ==

	In this problem, you will design colormaps for a dataset. In		In this problem, you will design colormaps for a dataset. In
	particular, you will design two different colormaps for two different		particular, you will design two different colormaps for two different
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	c. Generate a visualization that is suited to both previous tasks. Describe in the notes why you chose this colormap.		c. Generate a visualization that is suited to both previous tasks. Describe in the notes why you chose this colormap.

	Grads only		=== Grads only ===

	d. Generate colormaps that give a good visualization of the low areas		d. Generate colormaps that give a good visualization of the low areas
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	== Problem 2: Differential visualization in scalar fields ==		== Problem 2: Differential visualization in scalar fields ==

	Using the same dataset as in the previous problem, in this problem you		Using the same dataset as in the previous problem, in this problem you
	will design and implement visualizations that answer the following		will design and implement visualizations that answer the following
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	== Problem 3: Basic vector field techniques ==		== Problem 3: Basic vector field techniques ==

	In this problem, you will use basic vector field visualization		In this problem, you will use basic vector field visualization
	techniques to investigate a 2D vector field.		techniques to investigate a 2D vector field.
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	== Problem 4: Differential information in vector fields ==		== Problem 4: Differential information in vector fields ==

	a. Generate a visualization that builds on 3b. and uses the background		a. Generate a visualization that builds on 3b. and uses the background
	to portray the magnitude of the vectors in the field. Potentially		to portray the magnitude of the vectors in the field. Potentially