I’m trying to replace the glOrtho function as I’m allowing the camera to change it’s offset in parallel projection mode.
I though it would be a simple case of shear then ortho ie.
| 1 0 a 0 |
| 0 1 b 0 |
| 0 0 1 0 |
| 0 0 0 1 |
then ortho with
| A 0 0 tA |
| 0 B 0 tB |
| 0 0 C tC |
| 0 0 0 1 |
Any ideas, as it doesn’t work?