Morph Map

Morph Map morphs between two related sets of volume data. The data sets must have the same grid dimensions, spacing, and numbers of points. By default, intermediate states are generated by linear interpolation. A smooth progression from one map to the other can be displayed and recorded as a movie. See also: Volume Series

There are several ways to start Morph Map, a tool in the Volume Data category (including from the Volume Viewer Tools menu).

The map files will be listed as choices if they have already been opened (from Volume Viewer or otherwise), or they can be located and opened with Browse.

Moving the Fraction slider generates the corresponding interpolated state. At a fraction of zero, the interpolated map is the same as the First map, and at a fraction of 1, it is the same as the Second map. Interpolation creates a new data set (Writable copy...) for which display parameters (threshold level/color, surface smoothing, etc.) can be adjusted in Volume Viewer to control the appearance of the morph.

• Undisplay original maps - undisplay the endpoint maps whenever the fraction is changed
• Multiplier for second map [factor] - scale the values in the second map by factor before calculating intermediate values
• Adjust threshold for constant volume - automatically adjust the threshold (contour level) to keep the enclosed volume constant
• Add to first map instead of interpolating - instead of linearly interpolating between data values D1 (from the first map) and D2 (from the second):

  D1(1–fraction) + D2(fraction)
  

  calculate intermediate values with:

  D1 + D2(fraction)
  

  This treats the second map as a delta to be applied to the first map. For example, the second map could represent normal mode fluctuations of the first map.

• movie File name and location
• File type (MPEG-1, MPEG-2, MPEG-4, AVI MSMPEG-4v2, Quicktime)
• Bit rate (default 6000 Kb/sec, typical of DVD movies) - higher rates increase quality but also file size