17 Mar
2004
17 Mar
'04
4:17 a.m.
On Mar 16, 2004, at 5:11 PM, Max Neupert wrote:
The y-value of the pix_blob symbol seems to be inverted (it gives out data from 1-0 instead of from 0-1, meaning 0.7 instead of 0.3).
Is that a bug?
It's more like a discrepancy between the QT pixmap and OpenGL coordinate space. We deal with pixels starting at the top left at (0,0) and work to say (720,480) whereas GL has a 0,0,0 origin and positive coordinates move up and right. So, should pix_blob report the 'center' of an image in relation to the original pixmap or related to the GL coordinate space? It currently does the former as it doesn't deliver -1..1 which would be more correct for the 3D world.
cgc