Pick dominant light from sh coeffs

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I have 9 red, 9 green and 9 blue sh coefficients (packed using the method
in appendix 10 of http://www.ppsloan.org/publications/StupidSH36.pdf).

I want to pick a single dominant light to use for specular. How would I go
about efficiently extracting the direction and color of that light from the
coefficients?

Looks like I need to calculate the "optimal linear direction" which is
supposedly in this paper
http://research.microsoft.com/en-us/um/people/johnsny/papers/ldprt.pdf, however
I can't see it. Worse still, if it is in there, it is probably an integral
that I will struggle to turn into code!

Thanks

Dan

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<div>I have=A09 red, 9 green and 9 blue sh coefficients (packed using the m=
ethod in appendix 10 of=A0<a href=3D"http://www.ppsloan.org/publications/St=
upidSH36.pdf">http://www.ppsloan.org/publications/StupidSH36.pdf</a>).</div=
><div>
<br></div>I want to pick a single=A0dominant=A0light to use for specular. H=
ow would I go about efficiently extracting the direction and color of that =
light from the coefficients?<div><br></div><div>Looks like I need to calcul=
ate the &quot;optimal linear direction&quot; which is supposedly in this pa=
per=A0<a href=3D"http://research.microsoft.com/en-us/um/people/johnsny/pape=
rs/ldprt.pdf">http://research.microsoft.com/en-us/um/people/johnsny/papers/=
ldprt.pdf</a>,=A0however I can&#39;t see it.=A0Worse still, if it is in the=
re, it is probably an integral that I will struggle to turn into code!</div=
>
<div><br></div><div>Thanks</div><div><br></div><div>Dan</div><div><div><br>=
</div><div><br></div></div>

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