I'm trying to make a game where a entity can walk normally on a vertical wall.
But i found a big problem...when the tilt of the entity is 90 (on the wall), the pan angle, wich doesn't rotate along with the entity, becomes equal to roll angle. So when using left/right arrows, the entity doesn't turn normally, but rolls as if I changed the roll angle.
There are ways to fix this?

(sorry for the bad english...and ask if something isn't clear )

I hope you speak German... Ich hoffe, dass du Deutsch sprichst:

Nun das liegt daran, dass die Entity immer zuerst zu seiner pan Ausrichtung gedreht wird und dann um diese pan Ausrichtung noch um seinen Tilt Wert und als letztes um seinen roll Winkel gedreht wird. Und wenn dann zum Beispiel tilt 90 ist, dann trifft es sich, dass roll und pan das gleiche bewirken.

Jupp

PS: Ich hoffe, dass du mich und diese Erklärung verstehst.

Sorry...i don't speak german, and i can't understand nothing of what you say...

Hello,
It's difficult for me to discribe this in English. I try it. Pan and roll are not the same. This is only in the special case, in wich tilt is 90 or -90. The engine rotates the entity first to its pan angle and then relativ from its pan angle to its tilt angle. And now relative from its tilt and pan angle to its roll angle. If you don't understand this, you have to wait for another memeber...

Sincerely yours
Jupp

Thanks, that's my problem. I want that my entity walks normally also when it's tilt is 90 or -90, but i can't get this, because of this sovrapposition of the angles. There is a way to avoid this?

3DGS uses Eular angles aligned to the level grid system.
you need to convert the angles to handle what your after.
Search 'getting started' forum I covered the topic about a month or so back.

use ang_add to change a temp vector, then set your player position vector to it for object axis oriented rotation:
if(key_g==on){vec_add(temp.x,(1,0,0)}
ang_add(temp.x,player.x)
vec_set(player.x,temp.x)

or you can adjust your angles with sines and cosines, vec_for_angle, and vec_to_angle which might work depending on your situation. Oh yeah, my game that has an angel flying around wouldn't work if you couldn't rotate him whichever way you want. I've found that 3D gamestudio's "Euler" rotation allows pan to only rotate around the z, tilt to rotate around x or y and roll around any axis (now that's pretty confusing!)

ang_add or ang_rotate is what you need for rotating an entity about it's own axis, rather than the world axis. For instance

ang_add(my.pan,vector(time,0,0));

or

ang_rotate(my.pan,vector(time,0,0));

Both instructions only differ in the order the angles are added.

What exactly is the diffrence?