Hi, I have used Mathematica to determine a 3x3 perspective transformation from one 2D image to another. Let's say that Mathematica gave me the following 3x3 matrix: a b c d e f g h 1 Now, moving outside of Mathematica, I'm trying to use that perspective xform it gave me in CSS on a webpage. There are two general matrix xform choices in CSS3: 2D "matrix" and 3D "matrix3d". The former, "matrix", is 3x3 but doesn't allow specification of the third row -- it's fixed to "0 0 1": p q r s t u 0 0 1 If I'm not mistaken, this is the form of an affine xform, but I'm trying to do a perspective transform which isn't affine. So, I thought I could use the more general "matrix3D", which allows all 16 elements to be specified: k l m n o p q r s t u v w x y z I am hoping that I can provide values that would accomplish the original transformation but leave z ordinates unaffected. Off the top of my head, as a wild guess, I thought it might be: a b 0 c d e 0 f 0 0 1 0 g h 0 1 where a,b,c,d,e,f,g,h are the values from the original 3x3 xform Mathematica gave me. I'm neither a physicist nor a mathematician, but thought this might be a good place to ask. Even though I'm ultimately trying to do a perspective xform on a web page using CSS, it seems like a generic sort of linear algebra question... Any help or pointers will be greatly appreciated.