48 lines
1.9 KiB
C
48 lines
1.9 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* init_camera.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: ntrahy <marvin@42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2016/11/23 04:55:58 by ntrahy #+# #+# */
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/* Updated: 2016/12/20 21:05:52 by scebula ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "rt.h"
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static t_vect get_first_pix_dir(t_cam cam)
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{
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t_vect first_pixel_pos;
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t_vect first_pixel_dir;
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mult_vector(&cam.dir, cam.cam_plane_dist);
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mult_vector(&cam.up, cam.plane_height / 2.0);
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mult_vector(&cam.left, cam.plane_width / 2.0);
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first_pixel_pos = cam.pos;
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add_to_vector(&first_pixel_pos, cam.dir);
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add_to_vector(&first_pixel_pos, cam.up);
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add_to_vector(&first_pixel_pos, cam.left);
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first_pixel_dir = init_vector(first_pixel_pos.x - cam.pos.x,
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first_pixel_pos.y - cam.pos.y, first_pixel_pos.z - cam.pos.z, 0);
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normalize_vector(&first_pixel_dir);
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return (first_pixel_dir);
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}
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void create_cam(t_cam *cam, t_data *d)
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{
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t_vect dir;
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normalize_vector(&(cam->dir));
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cam->cam_plane_dist = 1;
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cam->plane_width = 1;
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cam->plane_height = (double)d->height / (double)d->width;
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cam->up = init_vector(0, 1, 0, 0);
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dir = cam->dir;
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negative_vector(&dir);
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cam->left = cross_product_vector(dir, cam->up);
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cam->up = cross_product_vector(cam->left, dir);
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cam->first_pixel_dir = get_first_pix_dir(*cam);
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}
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