Directory Structure [step 1]: moving files

working on #672

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diff --git a/deps/g3dlite/source/Line.cpp b/deps/g3dlite/source/Line.cpp
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+++ b/deps/g3dlite/source/Line.cpp
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+/**
+  @file Line.cpp
+ 
+  Line class
+ 
+  @maintainer Morgan McGuire, graphics3d.com
+ 
+  @created 2001-06-02
+  @edited  2006-01-28
+ */
+
+#include "G3D/Line.h"
+#include "G3D/Plane.h"
+
+namespace G3D {
+
+Vector3 Line::intersection(const Plane& plane) const {
+    float d;
+    Vector3 normal = plane.normal();
+    plane.getEquation(normal, d);
+    float rate = _direction.dot(normal);
+
+    if (rate == 0) {
+
+        return Vector3::inf();
+
+    } else {
+        float t = -(d + _point.dot(normal)) / rate;
+
+        return _point + _direction * t;
+    }
+}
+
+
+Line::Line(class BinaryInput& b) {
+	deserialize(b);
+}
+
+
+void Line::serialize(class BinaryOutput& b) const {
+	_point.serialize(b);
+	_direction.serialize(b);
+}
+
+
+void Line::deserialize(class BinaryInput& b) {
+	_point.deserialize(b);
+	_direction.deserialize(b);
+}
+
+
+Vector3 Line::closestPoint(const Vector3& pt) const {
+    float t = _direction.dot(pt - _point);
+    return _point + _direction * t;
+}
+
+
+Vector3 Line::point() const {
+    return _point;
+}
+
+
+Vector3 Line::direction() const {
+    return _direction;
+}
+
+
+Vector3 Line::closestPoint(const Line& B, float& minDist) const {
+    const Vector3& P1 = _point;
+    const Vector3& U1 = _direction;
+
+    Vector3 P2 = B.point();
+    Vector3 U2 = B.direction();
+    
+    const Vector3& P21 = P2 - P1;
+    const Vector3& M = U2.cross(U1);
+    float m2 = M.length();
+
+    Vector3 R = P21.cross(M) / m2;
+    
+    float t1 = R.dot(U2);
+    
+    minDist = abs(P21.dot(M)) / sqrt(m2);
+
+    return P1 + t1 * U1;
+}
+
+}
+