Re: Pick dominant light from sh coeffs
"David Neubelt" <[email protected]> Thu, 2 Feb 2012 15:54:11 -0800
| Newsgroups | gmane.games.devel.algorithms |
|---|---|
| Message-ID | <[email protected]> |
This is a multi-part message in MIME format. --===============7400750246106116596== Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01CCE205.F5935C85" This is a multi-part message in MIME format. ------_=_NextPart_001_01CCE205.F5935C85 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Looks like you want to normalize the 3d vector made from the basis coefficients (-f[1,1], -f[1,-1], f[1,0]). Section 3.3 ZH Error Analysis paragraph 2. =20 -=3D Dave =20 From: Dan Treble [mailto:[email protected]]=20 Sent: Thursday, February 02, 2012 3:22 PM To: [email protected] Subject: [Algorithms] Pick dominant light from sh coeffs =20 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). =20 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? =20 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! =20 Thanks =20 Dan =20 =20 ------_=_NextPart_001_01CCE205.F5935C85 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable <html xmlns:v=3D"urn:schemas-microsoft-com:vml" = xmlns:o=3D"urn:schemas-microsoft-com:office:office" = xmlns:w=3D"urn:schemas-microsoft-com:office:word" = xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml" = xmlns=3D"http://www.w3.org/TR/REC-html40"><head><META = HTTP-EQUIV=3D"Content-Type" CONTENT=3D"text/html; = charset=3Dus-ascii"><meta name=3DGenerator content=3D"Microsoft Word 14 = (filtered medium)"><style><!-- /* Font Definitions */ @font-face {font-family:Calibri; panose-1:2 15 5 2 2 2 4 3 2 4;} @font-face {font-family:Tahoma; panose-1:2 11 6 4 3 5 4 4 2 4;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {margin:0in; margin-bottom:.0001pt; font-size:12.0pt; font-family:"Times New Roman","serif";} a:link, span.MsoHyperlink {mso-style-priority:99; color:blue; text-decoration:underline;} a:visited, span.MsoHyperlinkFollowed {mso-style-priority:99; color:purple; text-decoration:underline;} span.EmailStyle17 {mso-style-type:personal-reply; font-family:"Calibri","sans-serif"; color:#1F497D;} .MsoChpDefault {mso-style-type:export-only; font-family:"Calibri","sans-serif";} @page WordSection1 {size:8.5in 11.0in; margin:1.0in 1.0in 1.0in 1.0in;} div.WordSection1 {page:WordSection1;} --></style><!--[if gte mso 9]><xml> <o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" /> </xml><![endif]--><!--[if gte mso 9]><xml> <o:shapelayout v:ext=3D"edit"> <o:idmap v:ext=3D"edit" data=3D"1" /> </o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3Dblue = vlink=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span = style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497= D'>Looks like you want to normalize the 3d vector made from the basis = coefficients (-f[1,1], -f[1,-1], f[1,0]). Section 3.3 ZH Error Analysis = paragraph 2.<o:p></o:p></span></p><p class=3DMsoNormal><span = style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497= D'><o:p> </o:p></span></p><p class=3DMsoNormal><span = style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497= D'>-=3D Dave<o:p></o:p></span></p><p class=3DMsoNormal><span = style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497= D'><o:p> </o:p></span></p><p class=3DMsoNormal><b><span = style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>= </b><span style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> = Dan Treble [mailto:[email protected]] <br><b>Sent:</b> Thursday, = February 02, 2012 3:22 PM<br><b>To:</b> = [email protected]<br><b>Subject:</b> [Algorithms] = Pick dominant light from sh coeffs<o:p></o:p></span></p><p = class=3DMsoNormal><o:p> </o:p></p><div><p class=3DMsoNormal>I = have 9 red, 9 green and 9 blue sh coefficients (packed using the = method in appendix 10 of <a = href=3D"http://www.ppsloan.org/publications/StupidSH36.pdf">http://www.pp= sloan.org/publications/StupidSH36.pdf</a>).<o:p></o:p></p></div><div><p = class=3DMsoNormal><o:p> </o:p></p></div><p class=3DMsoNormal>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?<o:p></o:p></p><div><p = class=3DMsoNormal><o:p> </o:p></p></div><div><p = class=3DMsoNormal>Looks like I need to calculate the "optimal = linear direction" which is supposedly in this paper <a = href=3D"http://research.microsoft.com/en-us/um/people/johnsny/papers/ldpr= t.pdf">http://research.microsoft.com/en-us/um/people/johnsny/papers/ldprt= .pdf</a>, 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!<o:p></o:p></p></div><div><p = class=3DMsoNormal><o:p> </o:p></p></div><div><p = class=3DMsoNormal>Thanks<o:p></o:p></p></div><div><p = class=3DMsoNormal><o:p> </o:p></p></div><div><p = class=3DMsoNormal>Dan<o:p></o:p></p></div><div><div><p = class=3DMsoNormal><o:p> </o:p></p></div><div><p = class=3DMsoNormal><o:p> </o:p></p></div></div></div></body></html> ------_=_NextPart_001_01CCE205.F5935C85-- --===============7400750246106116596== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline ------------------------------------------------------------------------------ Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. 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