Can someone help about the arGetTransMat function

[bianzhq]

Now I am working on the global coordinate. And I find that though the transformation matrix can work well in pasting virtual objects, I don't know what is the detail meaning of the transformation matrix and the transformation matrix from the marker coordinate to global coordinate. Thank you!

[philip_lamb]

The transformation matrix specifies the relationship between the marker and the camera. It is just the top 3 rows of a 4 by 4 homogenous coordinate transformation matrix as used by OpenGL. As this is not really an ARToolKit related question, I suggest you read a book on how OpenGL deals with transformations.. the OpenGL Programming Guide (The so-called "red book") is a good place to start.