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Color Dipping
The assignment of color to the structure is the
primary modification done to the alligator algorithm. As each vertex was
assigned a set of coordinates, the x and y values of the coordinates would
be used to index into the cropped color slice to get the RGBA color. As
only one object mask slice was processed at a time, only one color data
slice was required to support this assignment. As a result, the polygon
mesh was dipped into its volume of interest to get the color for the vertex.
The color of the vertex was stored with the vertex as an extension of
that vertex.
The cropped color slices were stored in the
TIFF file format. In order to read those files we used a free-ware TIFF
library provided by Silicon Graphics through the graphic file format encyclopedia
[19]. Each color file was read into the color
buffer in turn to match the object mask file currently being processed.
This method of reading only the current color slice supports the color
requirements of the original program. However when mesh reduction and triangulation
of the surface are implemented a multi-color file scheme must be implemented
to support the local volume of interests color. We need to defined a measured
distance between the original color of the data and the dipped color of
the reconstructed surfaces.
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