X-Git-Url: https://git.dogcows.com/gitweb?a=blobdiff_plain;f=src%2Fmoof%2Fplane.cc;fp=src%2Fmoof%2Fplane.cc;h=4a175b0932cc0ded5f8039bcf3491cc6d215b3c3;hb=831f04d4bc19a390415ac0bbac4331c7a65509bc;hp=0000000000000000000000000000000000000000;hpb=299af4f2047e767e5d79501c26444473bda64c64;p=chaz%2Fyoink

diff --git a/src/moof/plane.cc b/src/moof/plane.cc
new file mode 100644
index 0000000..4a175b0
--- /dev/null
+++ b/src/moof/plane.cc
@@ -0,0 +1,51 @@
+
+/*]  Copyright (c) 2009-2010, Charles McGarvey  [**************************
+**]  All rights reserved.
+*
+* vi:ts=4 sw=4 tw=75
+*
+* Distributable under the terms and conditions of the 2-clause BSD license;
+* see the file COPYING for a complete text of the license.
+*
+**************************************************************************/
+
+#include "aabb.hh"
+#include "plane.hh"
+#include "sphere.hh"
+
+
+namespace moof {
+
+
+plane::halfspace plane::intersects(const aabb<3>& aabb) const
+{
+	vector3 corners[8];
+	int nPositive = 8;
+
+	aabb.get_corners(corners);
+
+	for (int i = 0; i < 8; ++i)
+	{
+		if (intersects(corners[i]) == negative)
+		{
+			--nPositive;
+		}
+	}
+
+	if (nPositive == 0)      return negative;
+	else if (nPositive == 8) return positive;
+	else                     return intersecting;
+}
+
+plane::halfspace plane::intersects(const sphere<3>& sphere) const
+{
+	scalar distance = distance_to_point(sphere.point);
+
+	if (distance < -sphere.radius)     return negative;
+	else if (distance < sphere.radius) return intersecting;
+	else                               return positive;
+}
+
+
+} // namespace moof
+