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revision 1.75 by jvk, Tue Nov 26 14:35:23 2002 UTC revision 1.76 by tjl, Tue Nov 26 20:18:12 2002 UTC
# Line 633  the corresponding HILO textures for offs Line 633  the corresponding HILO textures for offs
633    
634  \begin{figure}  \begin{figure}
635  \centering  \centering
636  \fbox{\vbox{\vskip 3in}}  \def\w{4cm}
637    \includegraphics[width=\w]{texcomb_a.ps}%
638    \includegraphics[width=\w]{texcomb_b.ps}\\
639    \includegraphics[width=\w]{texcomb_c.ps}%
640    \includegraphics[width=\w]{texcomb_d.ps}
641  \caption{  \caption{
642  \label{fig-regcomb}  \label{fig-regcomb}
643  How register combiners on the NV10 architecture  How the limited register combiners of the NV10 architecture
644  can be used to generate shapes. (band-like!)  can be used to generate shapes.
645    Top: the two basis textures.
646    Bottom left: dot product of the basis textures:
647    $2(2a-1)\cdot(2b-1)+1/2$, where $a$ and $b$ are the texture RGB values.
648    Bottom right: dot product of the basis textures squared:
649    $32\left( (2a-1)\cdot(2b-1) \right)^2$.
650    This term can then be used to modulate between two colors.
651  }  }
652  \end{figure}  \end{figure}
653    

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