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sample. We combine these representations with various rendering techniques
and with user interactions to enable exploration of the data.
The most useful information is generated by deriving surfaces from the data.
Figure 11-a shows a polygonal surface representing the polymer scaffold. This
data was produced by NIST's OCM instrument. The surfaces are derived using
simple isosurface algorithms as well as more elaborate level-set approaches.
We enhance the depiction of these surfaces with lighting effects and the use
of transparency. Simulated lighting effects help to expose the shape of three
dimensional surfaces. Transparency enables the user to see the internal structure
of three dimensional data sets. For example, Fig. 11-b shows the same scaffold
surface as Fig. 11-a, but the surface is transparent and it is combined with
surfaces that represent cells growing on the scaffold. The cell data was produced
by CFM techniques and is combined with the OCM data in this scene.
We also make use of two-dimensional representations, but we embed them
as appropriate into the three-dimensional scene. For example, in Fig. 11-c, we
show a two-dimensional cross section through the three dimensional volume of
OCM/CFM data. The scaffold surface has been removed to enable the user to
see the cross section.
a.
b.
c. d.
Fig. 11. a. Polymer scaffold material represented as a polygon surface. b. Polymer
scaffold material with cells. Scaffold surface is represented as a transparent surface.
c. A two-dimensional cross section of scaffold and cell data embedded within a three-
dimensional scene. d. Combined volume and polygon representation of OCM scaffold
data.
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