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coupe interesction cylinder

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H3XploR
2025-02-17 18:08:58 +01:00
parent 0bd320f204
commit 224c55611a
6 changed files with 191 additions and 16 deletions
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parsing_cylinder.c
+81 -1
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@@ -6,7 +6,7 @@
/* By: yantoine <yantoine@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2025/02/15 19:54:13 by yantoine #+# #+# */
/* Updated: 2025/02/15 19:54:28 by yantoine ### ########.fr */
/* Updated: 2025/02/17 18:08:15 by yantoine ### ########.fr */
/* */
/* ************************************************************************** */
@@ -25,3 +25,83 @@ t_scene parsing_cylinder(const char *line, t_scene scene)
scene.numCylinders++;
return (scene);
}
float intersectCylinder(Ray ray, Cylinder cy, t_vec3 *hitNormal)
{
t_calc calc;
calc.d = ray.dir;
calc.oc = vec3_sub(ray.origin, cy.center);
calc.v = cy.axis;
calc.d_dot_v = vec3_dot(calc.d, calc.v);
calc.oc_dot_v = vec3_dot(calc.oc, calc.v);
calc.d_perp = vec3_sub(calc.calc.d, vec3_scale(calc.v, calc.d_dot_v));
oc_perp = vec3_sub(calc.oc, vec3_scale(calc.v, calc.oc_dot_v));
calc.a = vec3_dot(calc.d_perp, calc.d_perp);
calc.b = 2 * vec3_dot(calc.d_perp, oc_perp);
calc.c = vec3_dot(oc_perp, oc_perp) - cy.radius * cy.radius;
calc.disc = calc.b * calc.b - 4 * calc.a * calc.c;
if (calc.disc < 0)
return (-1);
calc.sqrtDisc = sqrtf(calc.disc);
calc.t0 = (-calc.b - calc.sqrtDisc) / (2 * calc.a);
calc.t1 = (-calc.b + calc.sqrtDisc) / (2 * calc.a);
calc.t_side = -1;
if (calc.t0 > 1e-3f)
{
calc.y = calc.oc_dot_v + calc.t0 * calc.d_dot_v;
if (fabs(calc.y) <= cy.height / 2.0f)
calc.t_side = calc.t0;
}
if (calc.t_side < 0 && calc.t1 > 1e-3f)
{
calc.y = calc.oc_dot_v + calc.t1 * calc.d_dot_v;
if (fabs(calc.y) <= cy.height / 2.0f)
calc.t_side = calc.t1;
}
calc.t_cap = -1;
if (fabs(calc.d_dot_v) > 1e-6f)
{
calc.t_bot = ((-cy.height / 2.0f) - calc.oc_dot_v) / calc.d_dot_v;
if (calc.t_bot > 1e-3f)
{
p = vec3_add(ray.origin, vec3_scale(calc.d, calc.t_bot));
cp = vec3_sub(p, cy.center);
calc.dist = vec3_length(vec3_sub(cp, vec3_scale(calc.v, vec3_dot(cp, calc.v))));
if (calc.dist <= cy.radius)
calc.t_cap = calc.t_bot;
}
t_top = ((cy.height / 2.0f) - calc.oc_dot_v) / calc.d_dot_v;
if (t_top > 1e-3f)
{
p = vec3_add(ray.origin, vec3_scale(calc.d, t_top));
cp = vec3_sub(p, cy.center);
calc.dist = vec3_length(vec3_sub(cp, vec3_scale(calc.v, vec3_dot(cp, calc.v))));
if (calc.dist <= cy.radius && (calc.t_cap < 0 || t_top < calc.t_cap))
calc.t_cap = t_top;
}
}
calc.t_final = -1;
if (calc.t_side > 1e-3f && calc.t_cap > 1e-3f)
calc.t_final = (calc.t_side < calc.t_cap) ? calc.t_side : calc.t_cap;
else if (calc.t_side > 1e-3f)
calc.t_final = calc.t_side;
else
calc.t_final = calc.t_cap;
if (calc.t_final < 1e-3f)
return (-1);
calc.hitPoint = vec3_add(ray.origin, vec3_scale(calc.d, calc.t_final));
cp = vec3_sub(calc.hitPoint, cy.center);
calc.proj = vec3_dot(cp, calc.v);
if (fabs(calc.proj) < cy.height / 2.0f - 1e-3f)
{
calc.n = vec3_sub(cp, vec3_scale(calc.v, calc.proj));
*hitNormal = vec3_normalize(calc.n);
}
else
{
*hitNormal = (calc.proj > 0) ? calc.v : vec3_scale(calc.v, -1);
}
return calc.t_final;
}