Good evening everybody,
somehow i got really confused by angular calculation this evening(or maybe its just tooo late, maybe both)

following usecase:

Imagine 2 portals.
from our view we look through the first and the viewangle is transformed for the outputportal.

The green line marks the track
the red thing is our view
the blue line marks the view direction of each object

How do i transform the viewangle correctly?
I know it depends on the angle difference between each of these dots but somehow my output is just rubbish.

Maybe someone has an idea?

edit: idea, mirror the brown portals angle, substract it from the purple portals angle and add this to the view angle.
Correct or incorrect?

Greetings
Rackscha

target portal view angle = camera.angle + (see through portal angle - target portal angle)

just a guess....

vec_set(PortalView.pan, camera.pan);
ang_rotate(PortalView.pan, PortalAngleOffset);

This shoud work.

ah thanks guys, i'll try it when i am home.

so this should be my solution:

AH NICE, it works. My solution looks like this:



Why the rotation by 180? as you can see in the pic above, the first portal is flipped by 180. Otherwhise, the endangle will look into the direct oposite direction.

and ang_add is right here, ang_rotate at the end will result it weird angles.

Just finished my vector and rotation functions which transform through portals.

thanks kartoffel

@Uhrwerk:
your solution doesnt work, because addition/substraction is not possible for euler angles. But thanks for your effort

Greetings
Rackscha

You're even using ang_add and ang_diff in your code...

oh, thats what you mean^^
Missunderstood your example and reffered to vec_add etc

of course ._.
ang_rotate rotates the euler vector relative to the current angle ...my bad

anyway, nice to hear that it works!