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diff --git a/engines/pegasus/neighborhood/mars/spacechase3d.h b/engines/pegasus/neighborhood/mars/spacechase3d.h
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+++ b/engines/pegasus/neighborhood/mars/spacechase3d.h
@@ -0,0 +1,91 @@
+/* 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.
+ *
+ * Additional copyright for this file:
+ * Copyright (C) 1995-1997 Presto Studios, Inc.
+ *
+ * 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 2
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef PEGASUS_NEIGHBORHOOD_MARS_SPACECHASE3D_H
+#define PEGASUS_NEIGHBORHOOD_MARS_SPACECHASE3D_H
+
+#include "pegasus/neighborhood/mars/constants.h"
+
+namespace Pegasus {
+
+// This is approximately right for a field of view of 72 degrees
+// (Should be set to the tangent of FOV).
+//static const float kTangentFOV = 0.76254;
+static const float kTangentFOV = 1.0;
+
+// Define these as macros and they can be used to define constants...
+#define convertSpaceXToScreenH(x, z) \
+	((x) / (z) * (kScreenWidth / (2 * kTangentFOV)) + kShuttleWindowMidH)
+
+#define convertSpaceYToScreenV(y, z) \
+	(kShuttleWindowMidV - (y) / (z) * (kScreenWidth / (2 * kTangentFOV)))
+
+#define convertScreenHToSpaceX(x, d) \
+	(((2.0 * kTangentFOV) / kScreenWidth) * ((float)(x) - kShuttleWindowMidH) * (d))
+
+#define convertScreenVToSpaceY(y, d) \
+	(((2.0 * kTangentFOV) / kScreenWidth) *	((float)kShuttleWindowMidV - (y)) * (d))
+
+struct Point3D {
+	float x, y, z;
+
+	Point3D() : x(0), y(0), z(0) {}
+	Point3D(float x1, float y1, float z1) : x(x1), y(y1), z(z1) {}
+	bool operator==(const Point3D &p) const { return x == p.x && y == p.y && z == p.z; }
+	bool operator!=(const Point3D &p) const { return x != p.x || y != p.y || z != p.z; }
+
+	void translate(float dx, float dy, float dz) {
+		x += dx;
+		y += dy;
+		z += dz;
+	}
+};
+
+static const int kScreenWidth = kShuttleWindowWidth;
+
+bool isNegative(int a);
+bool isPositive(int a);
+int sign(int a);
+bool sameSign(int a, int b);
+
+void project3DTo2D(const Point3D &pt3D, Common::Point &pt2D);
+void project2DTo3D(const Common::Point &pt2D, const float screenDistance, Point3D &pt3D);
+
+void linearInterp(const Point3D &pt1, const Point3D &pt2, const float t, Point3D &pt3);
+void linearInterp(const Point3D &pt1, const float x2, const float y2, const float z2, const float t, Point3D &pt3);
+void linearInterp(const float x1, const float y1, const float z1, const Point3D &pt2, const float t, Point3D &pt3);
+void linearInterp(const float x1, const float y1, const float z1, const float x2,
+		const float y2, const float z2, const float t, Point3D &pt3);
+
+void linearInterp(const Common::Point &pt1, const Common::Point &pt2, const float t, Common::Point &pt3);
+void linearInterp(const Common::Point &pt1, const float h2, const float v2, const float t, Common::Point &pt3);
+void linearInterp(const float h1, const float v1, const Common::Point &pt2, const float t, Common::Point &pt3);
+void linearInterp(const float h1, const float v1, const float h2, const float v2, const float t, Common::Point &pt3);
+
+float linearInterp(const float arg1, const float arg2, const float t);
+
+} // End of namespace Pegasus
+
+#endif