[Radiance-general] View-Up Vector

[Roland Schregle]

Volker Hilsenstein wrote:
> 
> Hello everyone,
> 
> I've got a quick question regarding the "view up"-vector:
> as far as I understand, the -vd vector in  a view definition points
> along the view direction (optical axis) of my virtual camera, whereas
> the -vu points along the vertical (up) direction of my virtual camera.
> So I guess they should be orthogonal. How does it affect
> my view if I choose vu and vd such that they are not orthogonal
> (Radiance only complains if  vd and vu are exactly parallel)  ?

Howdy Volker,

vu and vd are always orthogonal per definition, unless of course you
make them parallel, which doesn't make sense. In all other cases vu will
be modified to lie within the projection plane, with vd being the
plane's normal.

See ya!


-- 
"Life is too short for core dumps"