Example a_backup/ao: Streamlines : Showing heart fibres

Using streamlines to visualise the fibre and sheet directions in the heart. This first image below shows the results of this example, with the coloured ribbons aligned along the fibre axis with the width of the ribbons aligned with the sheets. The colour spectrum indicates the distance along the ribbon: blue (0) at the start of the streamline and red (100) at the end. The gold ribbons use the reordered fibre tensor to be aligned with the sheet axis with the width oriented to the fibre direction. These streamlines are shown on their own in the second image.

The comfile run by this example is as follows:

#Example_ao: Streamlines : Showing heart fibres
#
# This example shows how to use streamlines to display the
# fibre field inside the heart.
#
#----------
#
# Create the graphics window
#
gfx create window 1
gfx modify window 1 view perspective eye_point 9.70453 -289.811 -5.00082 interest_point 9.70453 6.38585 -5.00082 up_vector -1 0 6.12323e-17 view_angle 18.2876 near_clipping_plane 2.96197 far_clipping_plane 1058.51 relative_viewport ndc_placement -1 1 2 2 viewport_coordinates 0 0 1 1
#
# Load the exnode and exelem files
#
set dir example a3
gfx read nodes example heart.exnode
gfx read elements example heart.exelem
#
# Define a few materials
#
gfx create material red ambient 1 0 0 diffuse 1 0 0 emission 0 0 0 specular 0.8 0.8 0.8 alpha 1 shininess 0.8
gfx create material green ambient 0 0.6 0 diffuse 0 0.6 0 emission 0 0 0 specular 0.8 0.8 0.8 alpha 1 shininess 0.8
gfx create material bluey ambient 0 0.2 0.4 diffuse 0 0.5 1 emission 0 0 0 specular 0.5 0.5 0.5 alpha 1 shininess 0.8
gfx create material gold ambient 1 0.7 0 diffuse 1 0.7 0 emission 0 0 0 specular 1 1 0.8 alpha 1 shininess 0.8
gfx create material purple ambient 1 0 1 diffuse 1 0 1 emission 0 0 0 specular 1 1 1 alpha 1 shininess 0.74
gfx create material heart ambient 0.3 0 0.3 diffuse 1 0 0 specular 0.5 0.5 0.5 shininess 0.5
#
# By default when the three fibre angles are used as a vector they are
# generalised into a 9 component tensor.
# The first three components are a vector aligned with the fibre direction, 
# the second three components are the vector which is orthogonal to the fibre
# direction but which also lies in the sheet, and the third group of three 
# components are a vector orthogonal to the first two.
#
# Therefore by drawing stream ribbons aligned with this coordinate system
# you get ribbons which track the fibre direction with the ribbons lying
# in the sheet plane.
#
# As this happens automatically if you list the values of the fibres field
# you see the three angles.
#
gfx modify g_element heart element_points use_elements glyph point label fibres discretization "1*1*1" cell_centres material default
#
#Delete these labels.
#
gfx modify g_element heart element_points use_elements glyph point label fibres delete
#
# You can manually expand the three angles into the 9 component tensor.
#
gfx define field fibre_vector fibre_axes fibre fibres coordinate coordinates
gfx modify g_element heart element_points use_elements glyph point label fibre_vector discretization "1*1*1" cell_centres material default
#
#Delete these again.
#
gfx modify g_element heart element_points use_elements glyph point label fibre_vector delete
#
#
# Display basic streamlines representing the fibres
#
gfx mod g_e heart streamlines ribbon material green vector fibres length 100 
#
# Display surfaces of heart chambers
# 
gfx mod g_e heart surfaces exterior face xi3_0 mat heart
#
# By reordering the components of the fibre_vector field we get a 3-vector field 
# which is orthogonal to the fibre axes but still lies in the sheet. Note this
# makes a left-handed coordinate system unless we reverse the fibre direction,
# but this makes no difference for streamlines:
gfx define field sheet_vector composite fibre_vector.4 fibre_vector.5 fibre_vector.6 fibre_vector.1 fibre_vector.2 fibre_vector.3 fibre_vector.7 fibre_vector.8 fibre_vector.9
gfx mod g_e heart streamlines ribbon material gold vector sheet_vector length 100
#
# Streamlines can be rendered with data and spectrums in the normal way but
# can also show a value which is proportional to their length.  This is particularly
# useful in fields, unlike the fibre system, where the velocity (magnitude) of the
# vector field is changing.
#
gfx mod g_e heart streamlines ribbon material green vector fibres length 100 travel_scalar
gfx mod spectrum default auto
#
# There are additional options, all accessible through the graphical element
# editor for changing the profile of the streamline (ribbon is the current option, extruded rectangles
# or extruded elipses are other options), a shortcut for showing the magnitude of the tracked field
# as data and for restricting the seed to only a singular specific element.
#
# Additionally using the old commands you can seed streamlines at the points described by
# a data group which has an element_xi field.  See the seed_data_group and seed_data_field
# under gfx create streamlines.

Files used by this example are:

Name            Modified     Size

example_ao.com  20-Apr-2012  4.3k
COPYRIGHT       19-Apr-2012  504 

Download the entire example:

Name                         Modified     Size

examples_a_backup_ao.tar.gz  12-Aug-2014  1.1M

Testing status by version:

Testing status by file:

• status
  

  x86_64-linux
  139	cmgui-wx:	error exit status 139.
  139	cmgui-wx-debug:	error exit status 139.
  139	cmgui-wx-debug-memorycheck:	error exit status 139.
  139	cmgui-wx-debug-valgrind:	error exit status 139.

  
  
• cmiss_test.log
  

  i686-linux
  Success	cmgui-wx:	diff test: no differences with generic answer.
  Success	cmgui-wx-debug:	diff test: no differences with generic answer.
  Success	cmgui-wx-debug-memorycheck:	diff test: no differences with generic answer.
  Failure	cmgui-wx-debug-valgrind:	diff test: differences with generic answer; Test output.
  x86_64-linux
  Failure	cmgui-wx:	diff test: differences with generic answer; Test output.
  Failure	cmgui-wx-debug:	diff test: differences with generic answer; Test output.
  Failure	cmgui-wx-debug-memorycheck:	diff test: differences with generic answer; Test output.
  Failure	cmgui-wx-debug-valgrind:	diff test: differences with generic answer; Test output.

  
  

Html last generated: Sun Mar 6 05:50:53 2016

Input last modified: Fri Apr 20 15:56:29 2012