[GEM-dev] window with width < height

[Nicolas Montgermont]

Hello,

I have a window of 16/18 ratio (1920x2160 pixels) and a framebuffer with
the same dimensions.
I try to manage the perspec of the frame buffer but don't really
understand how it is working.

usually if i have a 16/9 ratio, I just send for example [dimen 1920
1080, rectangle 1, perspec -1.7777 1.7777 -1 1 1 20(
and then I can display things fullscreen with for example [rectangle
7.11111 4]3

here if i keep height as fixed i do:
[dimen 1920 2160, rectangle 1, perspec -0.8888 0.8888 -1 1 1 20(
but if I try to display a [rectangle 3.55555 4] it is far wider than the
window
[rectangle 1.8 4] seems closer to what it should look ( I have a
[translateXYZ 0 0 -4] before the frame buffer.
a square is far wider than expected as well.

So what perspec should I use?
Thx in advance,

Nicolas

-- 
http://www.nimon.org