tiny.geometry.Aabb

1/// An axis-aligned box. A box with `min` above `max` on any axis is empty.2pub const Aabb = extern struct {3    min: Vec3,4    max: Vec3,56    /// The box that contains nothing and grows to fit whatever joins it.7    pub const empty: Aabb = .{8        .min = Vec3.splat(std.math.inf(f32)),9        .max = Vec3.splat(-std.math.inf(f32)),10    };1112    pub fn fromPoint(p: Vec3) Aabb {13        return .{ .min = p, .max = p };14    }1516    pub fn join(a: Aabb, b: Aabb) Aabb {17        return .{ .min = a.min.min(b.min), .max = a.max.max(b.max) };18    }1920    pub fn joinPoint(box: Aabb, p: Vec3) Aabb {21        return .{ .min = box.min.min(p), .max = box.max.max(p) };22    }2324    pub fn inflate(box: Aabb, margin: f32) Aabb {25        return .{ .min = box.min.sub(Vec3.splat(margin)), .max = box.max.add(Vec3.splat(margin)) };26    }2728    pub fn isEmpty(box: Aabb) bool {29        return box.min.x > box.max.x or box.min.y > box.max.y or box.min.z > box.max.z;30    }3132    pub fn center(box: Aabb) Vec3 {33        return box.min.add(box.max).scale(0.5);34    }3536    pub fn extent(box: Aabb) Vec3 {37        return box.max.sub(box.min);38    }3940    /// Half the surface area, the cost weight of a surface area heuristic.41    pub fn halfArea(box: Aabb) f32 {42        if (box.isEmpty()) return 0;43        const e = box.extent();44        return e.x * e.y + e.y * e.z + e.z * e.x;45    }4647    /// The largest coordinate magnitude of either corner.48    pub fn magnitude(box: Aabb) f32 {49        return @max(box.min.abs().maxComponent(), box.max.abs().maxComponent());50    }5152    pub fn containsPoint(box: Aabb, p: Vec3) bool {53        return p.x >= box.min.x and p.x <= box.max.x and54            p.y >= box.min.y and p.y <= box.max.y and55            p.z >= box.min.z and p.z <= box.max.z;56    }5758    pub fn overlaps(a: Aabb, b: Aabb) bool {59        return a.min.x <= b.max.x and b.min.x <= a.max.x and60            a.min.y <= b.max.y and b.min.y <= a.max.y and61            a.min.z <= b.max.z and b.min.z <= a.max.z;62    }63};

1pub const Aabb = primitive.Aabb;