[PD] GEM: "up" parameter in view message

IOhannes m zmoelnig zmoelnig at iem.at
Thu Feb 23 16:27:41 CET 2006

Piotr Majdak wrote:
> Hi!
> thanks, your explanation is very clear. I wondered what happens setting
> the "up" vector to (0,0,1) in your example above. Generally, this should
> interfere with "target" and "view" vectors. But it doesn't - I think
> that only the "up" components, which are in the plane normal to the line
> defined by "view" and "target", are taken into account. The component
> parallel to the [view,target]-line seems to be ignored (what, of course,
> makes sense). Do you agree?

yep. for a reference explanation see "man gluFrustum"


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