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math/ray.h

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef MATH_RAY_H
+#define MATH_RAY_H
+
+#include "math/aabb.h"
+#include "math/matrix4.h"
+#include "math/quat.h"
+#include "math/vector3d.h"
+
+namespace Math {
+
+/**
+ * A three dimensional half-line
+ */
+class Ray {
+public:
+	Ray();
+	Ray(const Vector3d &origin, const Vector3d &direction);
+
+	Vector3d& getOrigin() { return _origin; }
+	Vector3d getOrigin() const { return _origin; }
+	Vector3d& getDirection() { return _direction; }
+	Vector3d getDirection() const { return _direction; }
+
+	/**
+	 * Apply a transformation to the ray
+	 */
+	void transform(const Matrix4 &matrix);
+
+	/**
+	 * Rotate the ray using a quaternion - rotates both origin and direction
+	 */
+	void rotate(const Quaternion &rot);
+
+	/**
+	 * Rotate the ray direction only using a quaternion - origin stays fixed
+	 */
+	void rotateDirection(const Quaternion &rot);
+
+	/**
+	 * Translate the ray by a vector
+	 */
+	void translate(const Vector3d &v);
+
+	/**
+	 * Test the intersection of the ray with an Axis Aligned Bounding Box
+	 */
+	bool intersectAABB(const AABB &aabb) const;
+
+	/**
+	 * Test and return the intersection of the ray with a triangle defned by 3 verticies
+	 *
+	 * @param v0 first triangle vertex
+	 * @param v1 second triangle vertex
+	 * @param v2 third triangle vertex
+	 * @param loc If return is true, set to the intersection point
+	 * @param dist If return is true, set to distance along the ray (relative to direction)
+	 */
+	bool intersectTriangle(const Vector3d &v0, const Vector3d &v1, const Vector3d &v2, Vector3d &loc, float &dist) const;
+
+private:
+	Vector3d _origin;
+	Vector3d _direction;
+};
+
+} // end of namespace Math
+
+#endif