[PD] GEM mapping units to pixels
altern2 at gmail.com
Sun May 13 21:10:52 CEST 2007
> the size rectangle 1 1 is 2 2.
> in fact, it goes from -1 to 1.
> you can see that in the simple attached patch.
> about the rectangle 10 10 that is not a square : this is exactly what
> i've got when i don't send the reset after the windows creation.
> on this point Gem does not react exactly the same way on linux than on
ah!... now i see ... so [rectangle 1 1] is equivalent to
glVertex3f(-1.0, 1.0, 0.0)
glVertex3f(1.0, 1.0, 0.0)
glVertex3f(1.0, -1.0, 0.0)
glVertex3f(-1.0, -1.0, 0.0)
so the final width and height is actually 2 units ... this is a bit
confusing in the documentation help patch, i mean i know some opengl but
still when i read width height words i thought about the width and
height of a rectangle in normal geometry and not opengl postion of the
vertex location from the current position.
but i think all is clear now.
many thanks for the help !!!
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