Updated how the vertices and matrices can be accessed. That is via indices ([x][y]) or just by named properties (like x or y).

matrix.py

@@ -1,7 +1,30 @@
 import math
 from vectors import Vector3d, Vector4d
 
-class Matrix4x4:
+class Matrix3x3:
+		
+	def __init__(self, row1, row2, row3):
+		self.rows = [row1, row2, row3]
+		
+	@property
+	def row1(self):
+		return self.rows[0]
+		
+	@property
+	def row2(self):
+		return self.rows[1]
+		
+	@property
+	def row3(self):
+		return self.rows[2]
+
+	def __getitem__(self, key):
+		return self.rows[key]
+		
+	def __setitem__(self, key, value):
+		self.rows[key] = value
+		
+class Matrix4x4(Matrix3x3):
 
 	def __init__(self, row1, row2, row3, row4):
 		if not isinstance(row1, Vector4d):
@@ -13,10 +36,11 @@ class Matrix4x4:
 		if not isinstance(row4, Vector4d):
 			raise ValueError("Row must be a Vector4d object.", row4)
 		
-		self.row1 = row1
-		self.row2 = row2
-		self.row3 = row3
-		self.row4 = row4
+		self.rows = [row1, row2, row3, row4]
+
+	@property
+	def row4(self):
+		return self.rows[3]
 		
 	def multiply_3d(self, vector3d):
 		x = vector3d.x * self.row1.x + vector3d.y * self.row2.x + vector3d.z * self.row3.x + self.row4.x
@@ -31,7 +55,14 @@ class Matrix4x4:
 		
 		return Vector3d(x, y, z)
 		
-	
+	def multiply_matrix(self, matrix4x4):
+		out = Matrix4x4.get_identity_matrix()
+		
+		for column in range(4):
+			for row in range(4):
+				out[row][column] = self.rows[row][0] * matrix4x4.rows[0][column] + self.rows[row][1] * matrix4x4.rows[1][column] + self.rows[row][2] * matrix4x4.rows[2][column] + self.rows[row][3] * matrix4x4.rows[3][column]
+		return out
+		
 	def get_projection_matrix(fov_degrees, aspect_ratio, near_plane, far_plane):
 		fov_rad = 1 / math.tan(fov_degrees * 0.5 / 180.0 * math.pi)
 		
@@ -73,10 +104,11 @@ class Matrix4x4:
 		row4 = Vector4d(0, 0, 0, 1)
 		
 		return Matrix4x4(row1, row2, row3, row4)
-
-class Matrix3x3:
 		
-	def __init__(self, row1, row2, row3):
-		self.row1 = row1
-		self.row2 = row2
-		self.row3 = row3
+	def get_translation_matrix(vector3d):
+		row1 = Vector4d(1, 0, 0, 0)
+		row2 = Vector4d(0, 1, 0, 0)
+		row3 = Vector4d(0, 0, 1, 0)
+		row4 = Vector4d(vector3d.x, vector3d.y, vector3d.z, 1)
+		
+		return Matrix4x4(row1, row2, row3, row4)