On 22. Jul 2011, at 19:06, Michael Pope [via Software] wrote:
> I get the screenFrustum, adjust the near/far clip planes based on the user
> settings and it's working fine.
> The only problem is that the origin of the ortho projection is the lower left
> of the canvas - I would like to preserve the origin, keeping it at the center
> of the current canvas.
The screen frustum maps the canvas 2D space so that one unit is one meter. It
is meant to draw 2D overlays.
The ortho frustum and ortho transform maps a 3D space so that your viewing cube
is defined by the wall description, i.e., a 'perspective' frustum with a FOV of
0 degrees. One unit corresponds to one meter, as in the perspective case. Check
where your object are wrt the focal plane. Often people place the way beyond
the focal plane so they appear smaller then they are.
Afaik you want the second.
HTH,
Stefan.
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