/[gzz]/gzz/Documentation/Manuscripts/Irregu/irregu.tex
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revision 1.5 by tjl, Sun Nov 10 09:40:21 2002 UTC revision 1.6 by tjl, Sun Nov 10 12:45:07 2002 UTC
# Line 137  Knuth \& John Hobby ref. Line 137  Knuth \& John Hobby ref.
137    
138  Non-photorealism: easier to understand motion; photorealistic would seem bizarre.  Non-photorealism: easier to understand motion; photorealistic would seem bizarre.
139    
140  \section{OpenGL implementation}  - draw edge
141    
142  Image-space algorithm: ... slow on NV10  For the edge thickness, scaling it with the scale of the paper is not good
143    (too photorealistic...), but neither is a constant width, which ...
144    Square root
145    
 GL\_EXT\_texture\_env\_add \& alpha ``mesh'' texture.  
146    
147  Content drawn using stencil.  \section{Hardware-accelerated implementation}
148    
149    \subsection{A shape with the correct type of motion}
150    
151    Drawing a shape with the correct properties is relatively
152    simple
153    
154    \subsection{Drawing the edge}
155    
156    \subsubsection{The oldest trick}
157    
158    Content drawn using stencil.
159  Border: multi-pass perturbed edge.  Border: multi-pass perturbed edge.
160    Inside only needs to be drawn twice.
161    
162    Quite fast, but still has overhead w.r.t.~just the shape.
163    Artifacts: edge thickness, small features
164    
165    
166    \subsubsection{Image-space algorithms}
167    
168    Image-space algorithm: ... slow on NV10
169    
170    \subsubsection{...}
171    
172    GL\_EXT\_texture\_env\_add \& alpha ``mesh'' texture.
173  cite rip-maps  cite rip-maps
174    
175  \subsection{Optimizations}  \subsubsection{Optimizations}
176    
177  Pre-computed edge width: interpolated between  Pre-computed edge width: interpolated between
178  3 or 4 stored angles.  3 or 4 stored angles.

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