Ok, perfect -- this is exactly what I hoped it to be! Thanks for the fast response, cheers, David
2012/5/15 Gregory J. Ward <[email protected]> > The code is pretty simple. So long as the "up vector" is not parallel to > the surface normal, it is used to orient the 0-degree azimuth position by > projecting it into the plane of the surface normal at the ray intersection > point. Make sense? > > -Greg > > > From: David Geisler-Moroder <[email protected]> > > Date: May 15, 2012 12:20:15 AM PDT > > > > Hi list, hi Greg, > > > > I have a question concerning the BSDF "up-vector". > > For e.g. a facade-mounted fenestration system the definition of the > vector is clear. > > But what, if I have a BSDF defining the material properties and use this > BSDF to > > simulate the BSDF of a daylighting system (i.e. curved specular > lamellae)? > > > > The comment in m_bsdf.c says that the "up-vector" together with the > surface normal > > defines the local coordinate system. How exactly is that done?? > Unfortunately I did > > not have time yet to dig deeper into the BSDF-code to find that out... > > > > Cheers, > > David >
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