Implemented the first version of the 3D engine. Added support for loading 'obj' files as a mesh.

vectors.py

@@ -11,6 +11,21 @@ class Vector3d:
 		self.y = y
 		self.z = z
 		
+	def cross_product(self, vector3d):
+		# Returns a line that is perpendicular to the parameter
+		# and self.
+		# Returns the 'normal'.
+		x = self.y * vector3d.z - self.z * vector3d.y
+		y = self.z * vector3d.x - self.x * vector3d.z
+		z = self.x * vectored.y - self.y * vector3d.x
+		
+		return Vector3d(x, y, z)
+		
+	def dot_product(self, vector3d):
+		# Returns a scalar that defines how similar two
+		# vectors are to one another.
+		return self.x * vector3d.x + self.y * vector3d.y + self.z * vector3d.z
+		
 class Vector2d:
 	def __init__(self, x, y):
 		self.x = x