Example -- Slicing Fluid Flow Data
This example slices through a volume generated by the
1. Investigate the Data
Generate the volume data with the command
Determine the range of the volume by finding the minimum and maximum of the coordinate data.
2. Create a Slice Plane at an Angle to the X-Axes
To create a slice plane that does not lie in an axes plane, first define a surface and rotate it to the desired orientation. This example uses a surface that has the same x- and y- coordinates as the volume.
Rotate the surface by -45 degrees about the x-axis and save the surface
ZData to define the slice plane; then delete the surface.
3. Draw the Slice Planes
Draw the rotated slice plane, setting the
interp so that it is colored by the figure colormap, and set the
none. Increase the
.8 to make this plane shine more brightly after adding a light source.
hold to on and add three more orthogonal slice planes at
zmin to provide a context for the first plane, which slices through the volume at an angle.
4. Define the View
To display the volume in correct proportions, set the data aspect ratio to
daspect). Adjust the axis to fit tightly around the volume (
axis) and turn on the
box to provide a sense of a 3-D object. The orientation of the axes can be selected initially using
rotate3d to determine the best
Zooming in on the scene provides a larger view of the volume (
camzoom). Selecting a projection type of
perspective gives the rectangular solid more natural proportions than the default orthographic projection (
5. Add Lighting and Specify Colors
Adding a light to the scene makes the boundaries between the four slice planes more obvious because each plane forms a different angle with the light source (
lightangle). Selecting a colormap with only 24 colors (the default is 64) creates visible gradations that help indicate the variation within the volume.
The Modifying the Color Mapping section shows how to modify how the data is mapped to color.
|Exploring Volumes with Slice Planes||Modifying the Color Mapping|
© 1994-2005 The MathWorks, Inc.