X-Git-Url: https://git.localhorst.tv/?a=blobdiff_plain;f=tst%2Fmodel%2FGeometryTest.cpp;h=82f88eeefcf5de296a3aaf9e013d65cd97509dde;hb=419e33e565bffbaf0416ed4a5f80e9c81f62a479;hp=51985aef7a70e38df8df09051d44911adf02cd72;hpb=c592d2d6e230851bd7ed74d98f9046469f4086fd;p=blank.git

diff --git a/tst/model/GeometryTest.cpp b/tst/model/GeometryTest.cpp
index 51985ae..82f88ee 100644
--- a/tst/model/GeometryTest.cpp
+++ b/tst/model/GeometryTest.cpp
@@ -4,6 +4,7 @@
 
 #include <limits>
 #include <glm/gtx/io.hpp>
+#include <glm/gtx/transform.hpp>
 
 CPPUNIT_TEST_SUITE_REGISTRATION(blank::test::GeometryTest);
 
@@ -18,7 +19,7 @@ void GeometryTest::tearDown() {
 }
 
 
-void GeometryTest::testRayAABBIntersection() {
+void GeometryTest::testRayBoxIntersection() {
 	Ray ray{ { 0, 0, 0 }, { 1, 0, 0 } }; // at origin, pointing right
 	AABB box{ { -1, -1, -1 }, { 1, 1, 1 } }; // 2x2x2 cube centered around origin
 	glm::mat4 M(1); // no transformation
@@ -62,5 +63,57 @@ void GeometryTest::testRayAABBIntersection() {
 	);
 }
 
+void GeometryTest::testBoxBoxIntersection() {
+	const float delta = std::numeric_limits<float>::epsilon();
+	float depth = 0;
+	glm::vec3 normal(0);
+
+	AABB box{ { -1, -1, -1 }, { 1, 1, 1 } }; // 2x2x2 cube centered around origin
+	glm::mat4 Ma(1); // identity
+	glm::mat4 Mb(1); // identity
+	// they're identical, so should probably intersect ^^
+
+	CPPUNIT_ASSERT_MESSAGE(
+		"identical OBBs don't intersect",
+		Intersection(box, Ma, box, Mb, depth, normal)
+	);
+	// depth is two, but normal can be any
+	// (will probably be the first axis of box a, but any is valid)
+	CPPUNIT_ASSERT_DOUBLES_EQUAL_MESSAGE(
+		"penetration depth of coincidental 2x2x2 boxes is not 2",
+		2.0f, depth, delta
+	);
+
+	Ma = glm::translate(glm::vec3(-2, 0, 0)); // 2 to the left
+	Mb = glm::translate(glm::vec3(2, 0, 0)); // 2 to the right
+	CPPUNIT_ASSERT_MESSAGE(
+		"distant OBBs intersect (2 apart, no rotation)",
+		!Intersection(box, Ma, box, Mb, depth, normal)
+	);
+	// depth and normal undefined for non-intersecting objects
+
+	Ma = glm::rotate(PI_0p25, glm::vec3(0, 0, 1)); // rotated 45° around Z
+	Mb = glm::translate(glm::vec3(2.4, 0, 0)); // 2.4 to the right
+	// they should barely touch. intersect by about sqrt(2) - 1.4 if my head works
+	CPPUNIT_ASSERT_MESSAGE(
+		"OBBs don't intersect (one rotated by 45°)",
+		Intersection(box, Ma, box, Mb, depth, normal)
+	);
+	CPPUNIT_ASSERT_DOUBLES_EQUAL_MESSAGE(
+		"bad penetration depth (with rotation)",
+		0.01421356237309504880f, depth, delta
+	);
+	CPPUNIT_ASSERT_EQUAL_MESSAGE(
+		"bad intersection normal (with rotation)",
+		glm::vec3(1, 0, 0), abs(normal) // normal can be in + or - x, therefore abs()
+	);
+
+	Mb = glm::translate(glm::vec3(3, 0, 0)); // 3 to the right
+	CPPUNIT_ASSERT_MESSAGE(
+		"OBBs intersect (one rotated by 45°)",
+		!Intersection(box, Ma, box, Mb, depth, normal)
+	);
+}
+
 }
 }