exquat(3alleg4) Allegro manual exquat(3alleg4)
NAME
exquat - A comparison between Euler angles and quaternions. Allegro game
programming library.
SYNOPSIS
**#include <allegro.h>**
**Example exquat**
DESCRIPTION
Euler angles are convenient for storing and creating 3D orientations.
However, this program demonstrates that they are not good when
interpolating between two different orientations. The problem is solved
by using Allegro's quaternion operations.
In this program, two cubes are rotated between random orientations.
Notice that although they have the same beginning and ending
orientations, they do not follow the same path between orientations.
One cube is being rotated by directly incrementing or decrementing the
Euler angles from the starting point to the ending point. This is an
intuitive notion, but it is incorrect because it does not cause the
object to turn around a single unchanging axis of rotation. The axis of
rotation wobbles resulting in the object spinning in strange ways. The
object will eventually end up in the orientation that the user intended,
but it gets there in a way that is unattractive. Imagine if this method
was used to update the position of a camera in a game! Sometimes it would
swing wildly and disorient the player.
The other cube is animated using quaternions. This results in a much more
pleasing animation because the cube turns around a single axis of
rotation.
SEE ALSO
**BITMAP**(3alleg4), **END_OF_MAIN**(3alleg4), **MATRIX_f**(3alleg4), **QUAT**(3alleg4),
**acquire_bitmap**(3alleg4), **allegro_error**(3alleg4), **allegro_init**(3alleg4),
**allegro_message**(3alleg4), **apply_matrix_f**(3alleg4), **blit**(3alleg4),
**circle**(3alleg4), **clear_keybuf**(3alleg4), **clear_to_color**(3alleg4),
**create_bitmap**(3alleg4), **desktop_palette**(3alleg4),
**destroy_bitmap**(3alleg4), **font**(3alleg4), **get_camera_matrix_f**(3alleg4),
**get_rotation_matrix**(3alleg4), **get_rotation_matrix_f**(3alleg4),
**get_rotation_quat**(3alleg4), **install_keyboard**(3alleg4),
**keypressed**(3alleg4), **line**(3alleg4), **matrix_mul_f**(3alleg4),
**palette_color**(3alleg4), **persp_project_f**(3alleg4),
**quat_interpolate**(3alleg4), **quat_to_matrix**(3alleg4), **readkey**(3alleg4),
**release_bitmap**(3alleg4), **rest**(3alleg4), **screen**(3alleg4),
**set_gfx_mode**(3alleg4), **set_palette**(3alleg4),
**set_projection_viewport**(3alleg4), **textout_ex**(3alleg4)
Allegro version 4.4.3 exquat(3alleg4)