You need all of these parameters to completely define the local coordinate system of
the camera. With the eye
parameter you specify the translation, together with the center parameter you specify
the local z axes. But how to
position the y and x-axes ? Therefore you specify the the direction of he positve x -
axis by doing the cross
product of the direction vector and the up vector. Since it is defined which
coordinate system (left or right
handed) is used, the third axes is also specified.
Borja Marcos Su�rez schrieb:
> I need that users set the position of the view. The method that I think i have to
>use is myViewTransform.lookAt.
>
> It needs 3 parameters:
> .- eye: the position that users set.
> .- center: in my program is Point3d (0,0,0)
> .- up: I dont have idea what this mean.
>
> I have looked the docs and I understand the frustrum idea, but not what is the
>vector up.
>
> When I have front view I set the view position in (0,0,50), but what I have to put
>with this method?
>
> Please help me... is urgent.
>
> ----------------------------------------------------------
> Borja Marcos Suarez
> mail: [EMAIL PROTECTED]
> icq: 41472800
> msn: [EMAIL PROTECTED]
>
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