Ported maths tests and added a test for #570.

Engine/source/math/test/mPlaneTest.cpp

@@ -0,0 +1,74 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) 2014 GarageGames, LLC
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to
+// deal in the Software without restriction, including without limitation the
+// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+// sell copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+// IN THE SOFTWARE.
+//-----------------------------------------------------------------------------
+
+#ifdef TORQUE_TESTS_ENABLED
+#include "testing/unitTesting.h"
+#include "math/mPlane.h"
+
+// Static test data. All combinations of position and normal are tested in each
+// test case. This allows a large number of tests without introducing non-
+// deterministic test behavior.
+
+static const Point3F positions[] = {Point3F(0, 0, 0), Point3F(1, -2, 3), Point3F(1e5, 2e5, -3e6)};
+static const U32 numPositions = sizeof(positions) / sizeof(Point3F);
+
+static const Point3F normals[] = {Point3F(1, 0, 0), Point3F(-4, -2, 6), Point3F(1e8, 2e7, 5e-2)};
+static const U32 numNormals = sizeof(normals) / sizeof(Point3F);
+
+/// Tests that points in the direction of the normal are in 'Front' of the
+/// plane, while points in the reverse direction of the normal are in
+/// 'Back' of the plane.
+TEST(Plane, WhichSide)
+{
+   for(U32 i = 0; i < numPositions; i++) {
+      for(U32 j = 0; i < numNormals; j++) {
+         Point3F position = positions[i];
+         Point3F normal = normals[j];
+
+         PlaneF p(position, normal);
+
+         EXPECT_EQ(p.whichSide(position + normal), PlaneF::Front );
+         EXPECT_EQ(p.whichSide(position - normal), PlaneF::Back );
+         EXPECT_EQ(p.whichSide(position), PlaneF::On );
+      }
+   }
+}
+
+/// Tests that the distToPlane method returns the exact length that the test
+/// point is offset by in the direction of the normal.
+TEST(Plane, DistToPlane)
+{
+   for(U32 i = 0; i < numPositions; i++) {
+      for(U32 j = 0; i < numNormals; j++) {
+         Point3F position = positions[i];
+         Point3F normal = normals[j];
+
+         PlaneF p(position, normal);
+
+         EXPECT_FLOAT_EQ(p.distToPlane(position + normal), normal.len());
+         EXPECT_FLOAT_EQ(p.distToPlane(position - normal), -normal.len());
+         EXPECT_FLOAT_EQ(p.distToPlane(position), 0);
+      }
+   }
+}
+
+#endif