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they would have been initialized to ``Not a Number'' to aid
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they would have been initialized to ``Not a Number'' to aid
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debugging. However, the $[10 10 10]^T$ vector could also have been
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debugging. However, the $[10 10 10]^T$ vector could also have been
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created differently, using
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created differently, using
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\begin{lstlisting}{}
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\begin{lstlisting}{}
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Vec3f p0(10);
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Vec3f p0(10);
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\end{}
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\end{lstlisting}
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A very common operation is to compute the normal of a triangle from
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A very common operation is to compute the normal of a triangle from
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the position of its vertices. Assuming the three vectors represent the
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the position of its vertices. Assuming the three vectors represent the
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vertices of a triangle, we can compute the normal by finding the
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vertices of a triangle, we can compute the normal by finding the
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vector from the first vertex to the two other vertices, taking the
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vector from the first vertex to the two other vertices, taking the
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