我做的很简短，我有两个4x4矩阵的实例，它接缝以共享内部数据列表。错误的代码如下。
mat0 = Matrix4f.Matrix4f()
print mat0
~ prints ~
[ 0.0, 0.0, 0.0, 0.0 ] # empty matrix
[ 0.0, 0.0, 0.0, 0.0 ]
[ 0.0, 0.0, 0.0, 0.0 ]
[ 0.0, 0.0, 0.0, 0.0 ]
~
mat0.initIdentity()
print mat0
~ prints ~
[ 1.0, 0.0, 0.0, 0.0 ] # identity matrix
[ 0.0, 1.0, 0.0, 0.0 ]
[ 0.0, 0.0, 1.0, 0.0 ]
[ 0.0, 0.0, 0.0, 1.0 ]
~
mat1 = Matrix4f.Matrix4f()
print mat0
~ prints ~
[ 1.0, 0.0, 0.0, 0.0 ] # still identity matrix
[ 0.0, 1.0, 0.0, 0.0 ]
[ 0.0, 0.0, 1.0, 0.0 ]
[ 0.0, 0.0, 0.0, 1.0 ]
~
mat1.mat[3] = 96
print mat0
~ prints ~
[ 1.0, 0.0, 0.0, 96 ] # why has mat0 changed as well...?
[ 0.0, 1.0, 0.0, 0.0 ]
[ 0.0, 0.0, 1.0, 0.0 ]
[ 0.0, 0.0, 0.0, 1.0 ]
~
获取完整信息，我提供了完整的Matrix4f模块，尽管我认为前20行是最相关的。我错过了什么吗？或者是列表中发生的事情？
class Matrix4f:
# alloc
def __init__(self, mat = [0.] * 16):
if len(mat) is not 16:
raise Exception("matrix array given is not of length 16")
self.mat = mat
# identity matrix
def initIdentity(self):
self.mat[ 0] = 1.
self.mat[ 5] = 1.
self.mat[10] = 1.
self.mat[15] = 1.
# Orthographic projection matrix
def initOrtho(self, left, right, bottom, top, near = -1, far = 1):
self.mat[ 0] = 2. / (right - left)
self.mat[ 3] = - (right + left) / (right - left)
self.mat[ 5] = 2. / (top - bottom)
self.mat[ 7] = - (top + bottom) / (top - bottom)
self.mat[10] = 2. / (far - near)
self.mat[11] = - (far + near) / (far - near)
self.mat[15] = 1.
def __mul__(self, other):
ret = Matrix4f()
ret.mat[ 0] = self.mat[ 0] * other.mat[ 0] + self.mat[ 1] * other.mat[ 4] + self.mat[ 2] * other.mat[ 8] + self.mat[ 3] * other.mat[12]
ret.mat[ 1] = self.mat[ 0] * other.mat[ 1] + self.mat[ 1] * other.mat[ 5] + self.mat[ 2] * other.mat[ 9] + self.mat[ 3] * other.mat[13]
ret.mat[ 2] = self.mat[ 0] * other.mat[ 2] + self.mat[ 1] * other.mat[ 6] + self.mat[ 2] * other.mat[10] + self.mat[ 3] * other.mat[14]
ret.mat[ 3] = self.mat[ 0] * other.mat[ 3] + self.mat[ 1] * other.mat[ 7] + self.mat[ 2] * other.mat[11] + self.mat[ 3] * other.mat[15]
ret.mat[ 4] = self.mat[ 4] * other.mat[ 0] + self.mat[ 5] * other.mat[ 4] + self.mat[ 6] * other.mat[ 8] + self.mat[ 7] * other.mat[12]
ret.mat[ 5] = self.mat[ 4] * other.mat[ 1] + self.mat[ 5] * other.mat[ 5] + self.mat[ 6] * other.mat[ 9] + self.mat[ 7] * other.mat[13]
ret.mat[ 6] = self.mat[ 4] * other.mat[ 2] + self.mat[ 5] * other.mat[ 6] + self.mat[ 6] * other.mat[10] + self.mat[ 7] * other.mat[14]
ret.mat[ 7] = self.mat[ 4] * other.mat[ 3] + self.mat[ 5] * other.mat[ 7] + self.mat[ 6] * other.mat[11] + self.mat[ 7] * other.mat[15]
ret.mat[ 8] = self.mat[ 8] * other.mat[ 0] + self.mat[ 9] * other.mat[ 4] + self.mat[10] * other.mat[ 8] + self.mat[11] * other.mat[12]
ret.mat[ 9] = self.mat[ 8] * other.mat[ 1] + self.mat[ 9] * other.mat[ 5] + self.mat[10] * other.mat[ 9] + self.mat[11] * other.mat[13]
ret.mat[10] = self.mat[ 8] * other.mat[ 2] + self.mat[ 9] * other.mat[ 6] + self.mat[10] * other.mat[10] + self.mat[11] * other.mat[14]
ret.mat[11] = self.mat[ 8] * other.mat[ 3] + self.mat[ 9] * other.mat[ 7] + self.mat[10] * other.mat[11] + self.mat[11] * other.mat[15]
ret.mat[12] = self.mat[12] * other.mat[ 0] + self.mat[13] * other.mat[ 4] + self.mat[14] * other.mat[ 8] + self.mat[15] * other.mat[12]
ret.mat[13] = self.mat[12] * other.mat[ 1] + self.mat[13] * other.mat[ 5] + self.mat[14] * other.mat[ 9] + self.mat[15] * other.mat[13]
ret.mat[14] = self.mat[12] * other.mat[ 2] + self.mat[13] * other.mat[ 6] + self.mat[14] * other.mat[10] + self.mat[15] * other.mat[14]
ret.mat[15] = self.mat[12] * other.mat[ 3] + self.mat[13] * other.mat[ 7] + self.mat[14] * other.mat[11] + self.mat[15] * other.mat[15]
return ret
# to string
def __str__(self, terminate = "\n"):
return ("[ " + str(self.mat[ 0]) + ",\t" + str(self.mat[ 1]) + ",\t" + str(self.mat[ 2]) + ",\t" + str(self.mat[ 3]) + " ]\n"
"[ " + str(self.mat[ 4]) + ",\t" + str(self.mat[ 5]) + ",\t" + str(self.mat[ 6]) + ",\t" + str(self.mat[ 7]) + " ]\n"
"[ " + str(self.mat[ 8]) + ",\t" + str(self.mat[ 9]) + ",\t" + str(self.mat[10]) + ",\t" + str(self.mat[11]) + " ]\n"
"[ " + str(self.mat[12]) + ",\t" + str(self.mat[13]) + ",\t" + str(self.mat[14]) + ",\t" + str(self.mat[15]) + " ]" + terminate)
抱歉缩进...
提前致谢！