libcruft-util/test/geom/ray.cpp

#include "geom/aabb.hpp"
#include "geom/plane.hpp"
#include "geom/ray.hpp"
#include "geom/iostream.hpp"
#include "tap.hpp"

using util::geom::ray2f;
using util::geom::ray3f;


//-----------------------------------------------------------------------------
void
test_intersect_plane (util::TAP::logger &tap)
{
    // trivial case: origin ray facing z, plane at unit z facing -z.
    const util::geom::ray3f l { .origin = 0, .direction = {0, 0, 1} };
    const util::geom::plane3f p (util::point3f {0,0,1}, util::vector3f {0,0,-1});

    tap.expect_eq (distance (l, p), 1.f, "ray-plane intersect");
}


//-----------------------------------------------------------------------------
void
test_intersect_aabb (util::TAP::logger &tap)
{
    using util::geom::aabb2f;

    // trivial case: unit aabb at origin, ray from (0.5,-0.5) upwards
    const aabb2f box {
        { 0.f, 0.f },
        { 1.f, 1.f }
    };

    const ray2f forward {
        util::point2f  { 0.5f, -0.5f },
        util::vector2f { 0.0f,  1.0f }
    };

    tap.expect_eq (distance (forward, box), 0.5f, "ray-aabb intersect");

    const ray2f behind {
        util::point2f  { 0.5f, 2.0f },
        util::vector2f { 0.0f, 1.0f }
    };

    tap.expect_eq (distance (behind, box), -1.f, "ray-aabb intersect behind");
}


//-----------------------------------------------------------------------------
int
main (void)
{
    util::TAP::logger tap;

    test_intersect_plane (tap);
    test_intersect_aabb (tap);

    return tap.status ();
}