1 files changed, 45 insertions, 0 deletions
diff --git a/src/ShadowVolume.cpp b/src/ShadowVolume.cpp
new file mode 100644
index 0000000..b0c25ca
--- /dev/null
+++ b/src/ShadowVolume.cpp
@@ -0,0 +1,45 @@
+/*
+ * ShadowVolume.cpp
+ *
+ * Copyright (C) 2009 Matthias Schiffer <matthias@gamezock.de>
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "ShadowVolume.h"
+#include "MathUtil.h"
+
+namespace Zoom {
+
+ShadowVolume::ShadowVolume(const Triangle &t, const vmml::vec3f &lightPos) {
+  MathUtil::Plane trianglePlane(t);
+
+  for(int i = 0; i < 3; ++i) {
+    rays[i].p = t.getVertex(i);
+  }
+
+  if(trianglePlane.isBehind(lightPos)) {
+    for(int i = 0; i < 3; ++i) {
+      rays[i].dir = vmml::vec3f::ZERO;
+    }
+
+    return;
+  }
+
+  for(int i = 0; i < 3; ++i) {
+    rays[i].dir = rays[i].p - lightPos;
+  }
+}
+
+}