52 lines
1.7 KiB
C
52 lines
1.7 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* maths_obj_cylinder.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: ntrahy <marvin@42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2017/01/03 00:44:39 by ntrahy #+# #+# */
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/* Updated: 2017/01/03 12:41:12 by scebula ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "rt.h"
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#include <math.h>
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static void check_for_solutions_cylinder(double *dist)
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{
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if (dist[0] > dist[1])
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swap_double(&dist[0], &dist[1]);
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if (dist[0] < 0 && dist[1] > 0)
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dist[2] = dist[1];
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else if (dist[0] > 0 && dist[1] > 0)
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dist[2] = dist[0];
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else
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{
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dist[0] = 0;
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dist[1] = 0;
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}
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}
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void get_cylinder_n(t_ray ray, t_obj *obj,
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t_thread *thread, double *dist)
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{
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double a;
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double b;
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double c;
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double delta;
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(void)thread;
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(void)obj;
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a = ray.dir.x * ray.dir.x + ray.dir.z * ray.dir.z;
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b = 2 * ray.dir.x * ray.ori.x + 2 * ray.dir.z * ray.ori.z;
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c = ray.ori.x * ray.ori.x + ray.ori.z * ray.ori.z - 1;
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delta = (b * b) - (4 * a * c);
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if (delta > 0)
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{
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dist[0] = (((-1 * b - sqrt(delta))) / (2 * a)) - ACC;
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dist[1] = (((-1 * b + sqrt(delta))) / (2 * a)) - ACC;
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check_for_solutions_cylinder(dist);
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}
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}
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