Search code examples
mathopenglmatrixtrigonometryquaternions

matrix/quaternion woes

So I got two matrices, the modelview matrix (should only rotates on the Y axis) and a rotation matrix (only rotates on the Y axis).

Now I need to know what the angle is of the projection (the view I'm looking at) and the rotation matrix's angle then I need to assign a vallue (between 0 and 8) based on that result.

or any other way I can add two rotations together and get a value between 0 and 8.

So basically if you're looking 90d and the enemy is walking 180d you'll see the sprite of the enemy drawn going right.

Solution

  • Forget matrices for now, based on your picture I think all you need is:

    direction = (model_view_rotation + enemy_rotation) % 360
direction = floor((direction + 22.5) / 45.0)

    which should give you a value between 0 and 8

    I'm assuming that view 8 is actually the same as view 0 ?