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const Ray = @import("ray.zig").Ray;
const Point3 = @import("vec.zig").Point3;
pub const Aabb = struct {
min: Point3,
max: Point3,
pub fn hit(aabb: Aabb, r: Ray, t_min: f64, t_max: f64) bool {
var t_min_ = t_min;
var t_max_ = t_max;
{
const s0 = (aabb.min.x - r.origin.x) / r.dir.x;
const s1 = (aabb.max.x - r.origin.x) / r.dir.x;
const t0 = @min(s0, s1);
const t1 = @max(s0, s1);
t_min_ = @max(t0, t_min_);
t_max_ = @min(t1, t_max_);
if (t_max_ <= t_min_) {
return false;
}
}
{
const s0 = (aabb.min.y - r.origin.y) / r.dir.y;
const s1 = (aabb.max.y - r.origin.y) / r.dir.y;
const t0 = @min(s0, s1);
const t1 = @max(s0, s1);
t_min_ = @max(t0, t_min_);
t_max_ = @min(t1, t_max_);
if (t_max_ <= t_min_) {
return false;
}
}
{
const s0 = (aabb.min.z - r.origin.z) / r.dir.z;
const s1 = (aabb.max.z - r.origin.z) / r.dir.z;
const t0 = @min(s0, s1);
const t1 = @max(s0, s1);
t_min_ = @max(t0, t_min_);
t_max_ = @min(t1, t_max_);
if (t_max_ <= t_min_) {
return false;
}
}
return true;
}
pub fn surroundingBox(box0: Aabb, box1: Aabb) Aabb {
return .{
.min = .{
.x = @min(box0.min.x, box1.min.x),
.y = @min(box0.min.y, box1.min.y),
.z = @min(box0.min.z, box1.min.z),
},
.max = .{
.x = @max(box0.max.x, box1.max.x),
.y = @max(box0.max.y, box1.max.y),
.z = @max(box0.max.z, box1.max.z),
},
};
}
};
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