tst/model/GeometryTest.cpp

   1 #include "GeometryTest.hpp"
   2
   3 #include "model/geometry.hpp"
   4
   5 #include <limits>
   6 #include <glm/gtx/io.hpp>
   7
   8 CPPUNIT_TEST_SUITE_REGISTRATION(blank::test::GeometryTest);
   9
  10
  11 namespace blank {
  12 namespace test {
  13
  14 void GeometryTest::setUp() {
  15 }
  16
  17 void GeometryTest::tearDown() {
  18 }
  19
  20
  21 void GeometryTest::testRayAABBIntersection() {
  22         Ray ray{ { 0, 0, 0 }, { 1, 0, 0 } }; // at origin, pointing right
  23         AABB box{ { -1, -1, -1 }, { 1, 1, 1 } }; // 2x2x2 cube centered around origin
  24         glm::mat4 M(1); // no transformation
  25
  26         const float delta = std::numeric_limits<float>::epsilon();
  27
  28         float distance = 0;
  29         glm::vec3 normal(0);
  30
  31         CPPUNIT_ASSERT_MESSAGE(
  32                 "ray at origin not intersecting box at origin",
  33                 Intersection(ray, box, M, &distance)
  34         );
  35         CPPUNIT_ASSERT_DOUBLES_EQUAL_MESSAGE(
  36                 "intersection distance way off",
  37                 0.0f, distance, delta
  38         );
  39         // normal undefined, so can't test
  40
  41         // move ray outside the box, but have it still point at it
  42         // should be 4 units to the left now
  43         ray.orig.x = -5;
  44         CPPUNIT_ASSERT_MESSAGE(
  45                 "ray pointing at box doesn't intersect",
  46                 Intersection(ray, box, M, &distance, &normal)
  47         );
  48         CPPUNIT_ASSERT_DOUBLES_EQUAL_MESSAGE(
  49                 "intersection distance way off",
  50                 4.0f, distance, delta
  51         );
  52         CPPUNIT_ASSERT_EQUAL_MESSAGE(
  53                 "wrong surface normal at intersection point",
  54                 glm::vec3(-1, 0, 0), normal
  55         );
  56
  57         // move ray to the other side, so it's pointing away now
  58         ray.orig.x = 5;
  59         CPPUNIT_ASSERT_MESSAGE(
  60                 "ray pointing away from box still intersects",
  61                 !Intersection(ray, box, M)
  62         );
  63 }
  64
  65 }
  66 }