/[gzz]/gzz/Documentation/Manuscripts/Irregu/irregu.tex
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revision 1.17 by tjl, Tue Nov 12 10:52:13 2002 UTC revision 1.18 by jvk, Tue Nov 12 11:02:36 2002 UTC
# Line 221  are quite similar. Line 221  are quite similar.
221    
222  \subsection{A shape with the correct type of motion}  \subsection{A shape with the correct type of motion}
223    
224    Surface defined by $(x, y, f(x,y))$ stored in a ``displacement map'' texture.
225    The jagged version of an edge in the $z=0$ plane is obtained by first
226    intersecting another plane going through the edge with the surface
227    and then ``projecting'' the intersection to the $z=0$ plane.
228    XXX: projecting so that the desired ``shape width'' is obtained.
229    
230    If the cutting plane is normal to $z=0$ plane, the edge is attached.
231    Otherwise, the edge may be sprinkled.
232    
233    ---
234    
235  Drawing a shape with the correct properties is relatively  Drawing a shape with the correct properties is relatively
236  simple: drawing a single polygon with $\alpha=0$ at $x=0$ and  simple: drawing a single polygon with $\alpha=0$ at $x=0$ and
237  $\alpha=1$ at $x=1$, using ALPHA\_TEST with the cutoff set close to one,  $\alpha=1$ at $x=1$, using ALPHA\_TEST with the cutoff set close to one,

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