/usr/include/tachyon/camera.h is in libtachyon-dev 0.99~b2+dfsg-0.3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* camera.h - This file contains the defines for camera routines etc.
*
* $Id: camera.h,v 1.22 2011/02/14 05:38:48 johns Exp $
*/
void camera_init(scenedef *);
void camray_init(scenedef *, ray *, unsigned long, unsigned long *, unsigned int);
void cameradefault(camdef *);
void cameraprojection(camdef *, int);
void cameradof(camdef *, flt focallength, flt aperture);
void camerafrustum(camdef *, flt l, flt r, flt b, flt t);
void camerazoom(camdef *, flt zoom);
void cameraposition(camdef * camera, vector center, vector viewvec,
vector upvec);
void getcameraposition(camdef * camera, vector * center, vector * viewvec,
vector * upvec, vector *rightvec);
color cam_aa_perspective_ray(ray *, flt, flt);
color cam_perspective_ray(ray *, flt, flt);
color cam_aa_dof_ray(ray *, flt, flt);
color cam_dof_ray(ray *, flt, flt);
color cam_aa_orthographic_ray(ray *, flt, flt);
color cam_orthographic_ray(ray *, flt, flt);
color cam_fisheye_ray(ray *, flt, flt);
color cam_aa_fisheye_ray(ray *, flt, flt);
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