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 #include <glm/gtx/transform.hpp>
   8
   9 CPPUNIT_TEST_SUITE_REGISTRATION(blank::test::GeometryTest);
  10
  11
  12 namespace blank {
  13 namespace test {
  14
  15 void GeometryTest::setUp() {
  16 }
  17
  18 void GeometryTest::tearDown() {
  19 }
  20
  21
  22 void GeometryTest::testRayBoxIntersection() {
  23         Ray ray{ { 0, 0, 0 }, { 1, 0, 0 } }; // at origin, pointing right
  24         AABB box{ { -1, -1, -1 }, { 1, 1, 1 } }; // 2x2x2 cube centered around origin
  25         glm::mat4 M(1); // no transformation
  26
  27         const float delta = std::numeric_limits<float>::epsilon();
  28
  29         float distance = 0;
  30         glm::vec3 normal(0);
  31
  32         CPPUNIT_ASSERT_MESSAGE(
  33                 "ray at origin not intersecting box at origin",
  34                 Intersection(ray, box, M, &distance)
  35         );
  36         CPPUNIT_ASSERT_DOUBLES_EQUAL_MESSAGE(
  37                 "intersection distance way off",
  38                 0.0f, distance, delta
  39         );
  40         // normal undefined, so can't test
  41
  42         // move ray outside the box, but have it still point at it
  43         // should be 4 units to the left now
  44         ray.orig.x = -5;
  45         CPPUNIT_ASSERT_MESSAGE(
  46                 "ray pointing at box doesn't intersect",
  47                 Intersection(ray, box, M, &distance, &normal)
  48         );
  49         CPPUNIT_ASSERT_DOUBLES_EQUAL_MESSAGE(
  50                 "intersection distance way off",
  51                 4.0f, distance, delta
  52         );
  53         CPPUNIT_ASSERT_EQUAL_MESSAGE(
  54                 "wrong surface normal at intersection point",
  55                 glm::vec3(-1, 0, 0), normal
  56         );
  57
  58         // move ray to the other side, so it's pointing away now
  59         ray.orig.x = 5;
  60         CPPUNIT_ASSERT_MESSAGE(
  61                 "ray pointing away from box still intersects",
  62                 !Intersection(ray, box, M)
  63         );
  64 }
  65
  66 void GeometryTest::testBoxBoxIntersection() {
  67         AABB box{ { -1, -1, -1 }, { 1, 1, 1 } }; // 2x2x2 cube centered around origin
  68         glm::mat4 Ma(1); // identity
  69         glm::mat4 Mb(1); // identity
  70         // they're identical, so should probably intersect ^^
  71
  72         CPPUNIT_ASSERT_MESSAGE(
  73                 "identical OBBs don't intersect",
  74                 Intersection(box, Ma, box, Mb)
  75         );
  76
  77         Ma = glm::translate(glm::vec3(-2, 0, 0)); // 2 to the left
  78         Mb = glm::translate(glm::vec3(2, 0, 0)); // 2 to the right
  79         CPPUNIT_ASSERT_MESSAGE(
  80                 "distant OBBs intersect (2 apart, no rotation)",
  81                 !Intersection(box, Ma, box, Mb)
  82         );
  83
  84         Ma = glm::rotate(PI_0p25, glm::vec3(0, 0, 1)); // rotated 45° around Z
  85         Mb = glm::translate(glm::vec3(2.4, 0, 0)); // 2.4 to the right
  86         // they should barely touch. intersect by about 0.01 if my head works
  87         CPPUNIT_ASSERT_MESSAGE(
  88                 "OBBs don't intersect (one rotated by 45°)",
  89                 Intersection(box, Ma, box, Mb)
  90         );
  91
  92         Mb = glm::translate(glm::vec3(3, 0, 0)); // 3 to the right
  93         CPPUNIT_ASSERT_MESSAGE(
  94                 "OBBs intersect (one rotated by 45°)",
  95                 !Intersection(box, Ma, box, Mb)
  96         );
  97 }
  98
  99 }
 100 }