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Matthew Turk committed 806155e

More definitions; this is draft 1.

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workshop_intro.tex

 }
 
 \defslide{Profile}{
-
+We use profiles to refer to accumulation of values along non-spatial axes.
+This can take the form of histograms, weighted averages, and the like.  For
+instance, total mass as a function of Density, or the average Temperature as a
+function of velocity.
 }
 
 \defslide{Slice}{
+A slice is an infinitesimally thin, variable resolution object that describes
+all the values at a given coordinate.
+}
 
+\defslide{Cutting Plane}{
+Just like a slice, except not aligned with an axis.  A lot slower, too.
 }
 
 \defslide{Projection}{
+An on-axis traversal, such that each resultant point is composed of five
+elements: $(x, y, dx, dy, v)$, calculated such that $v_i = \int f(z) dl$, where
+$z$ is along the axis of integration and $dl$ is the local path length.  They
+can also be calculated to return a weighted-average along sight lines.  In
+\yt{} projections are variable resolution and must be ...
+}
 
+\defslide{Pixelized}{
+The process of depositing values from a variable-resolution object (such as a
+projection or a slice) into a 2D buffer, from which an image can be made.
 }
 
 \defslide{Volume Rendering}{
-
+Usually ``volume rendering'' refers to some off-axis accumulation of colors
+along a plane of rays, for the purpose of visualization.  In \yt{} we use it to
+refer to any traversal of the grid by a set of vectors, including off-axis
+projections, averages, calculations of covering fractions and so on.  This
+includes as a side effect visualization!
 }
 
+\bigsimple{Okay, that wraps up the intro.}
+
 \end{document}