HDK : Matrix Inverse Problem

[iamjaideep80]

Hi.....

For a Vray procedural that I am writing, there is a object in camera space. Its transformation Matrix is Matrix A. I want to transform the object to the centre , rotate it and transform to the original position.

Lets say B = A inverse

R = Rotation matrix

So the final transform is F = A*R*B

But the problem is that, I am not getting "B" right.

My Matrix A is

1 0 0 0 0 1 0 0 0 0 -1 0 0 0 20 1

I am using A.invert( to invert A and place the result in B.

When I print B, it is same as A

1 0 0 0 0 1 0 0 0 0 -1 0 0 0 20 1

Why I am not getting the right inverse???

Plz Help