Aperture: Imported images from Olympus E-5 do not always maintain custom aspect ratios
If you use the Viewfinder on an Olympus E-5 camera to shoot images with a camera-set custom aspect ratio setting (other than the standard 4:3), the custom aspect ratio will not be retained when the images are imported into Aperture.
get_camera_matrix(3alleg4) Allegro manual get_camera_matrix(3alleg4)NAME
get_camera_matrix - Constructs a camera matrix for perspective projection. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
void get_camera_matrix(MATRIX *m, fixed x, y, z, xfront, yfront, zfront, fixed xup, yup, zup, fov, aspect);
DESCRIPTION
Constructs a camera matrix for translating world-space objects into a normalised view space, ready for the perspective projection. The x,
y, and z parameters specify the camera position, xfront, yfront, and zfront are the 'in front' vector specifying which way the camera is
facing (this can be any length: normalisation is not required), and xup, yup, and zup are the 'up' direction vector.
The fov parameter specifies the field of view (ie. width of the camera focus) in binary, 256 degrees to the circle format. For typical pro-
jections, a field of view in the region 32-48 will work well. 64 (90(de) applies no extra scaling - so something which is one unit away
from the viewer will be directly scaled to the viewport. A bigger FOV moves you closer to the viewing plane, so more objects will appear. A
smaller FOV moves you away from the viewing plane, which means you see a smaller part of the world.
Finally, the aspect ratio is used to scale the Y dimensions of the image relative to the X axis, so you can use it to adjust the propor-
tions of the output image (set it to 1 for no scaling - but keep in mind that the projection also performs scaling according to the view-
port size). Typically, you will pass (float)w/(float)h, where w and h are the parameters you passed to set_projection_viewport.
Note that versions prior to 4.1.0 multiplied this aspect ratio by 4/3.
SEE ALSO apply_matrix(3alleg4), get_align_matrix(3alleg4), set_projection_viewport(3alleg4), persp_project(3alleg4)Allegro version 4.4.2 get_camera_matrix(3alleg4)
