how can i do to a 2D image and spin it around it's X, Y, or Z axis as if it were a 3D image.in java?

Question

I want to achieve the effect of a 2D image I have but a little inclined, for example a plane, I want the image can be rotated about its axis Y. .. anyone can help me with some idea of how to do ..**

Answer 1

Basically you need a little linear geometry/algebra, and/or a package to do them for you.

From the geometry point of view, you think of the image as if it's on a plane in space; you're looking at it as if it were back-projected on your monitor. If the picture is exactly parallel to that screen, and the same size, each point is mapped to a pixel on the screen. Otherwise you have to go through a computation that makes that mapping, which involves a trig function for the angles in the x,y,z directions between that plane and the plane of the screen. The linear algebra comes in because the easy way to handle this computation is as a series of multiplications of 4×4 matrices.

Now, you could program all that yourself, and for what you're thinking of it wouldn't be all that difficult. See any good computer graphics text, like Shirley, or Foley and van Damm.

As far as a package, there's good 3D graphics in Java. Even better, there are good tutorials:

• The Java3D tutorial at Sun.
• the stuff at j3d.org
• a whole list of them at java3d.org

Answer 2

In what context ? Using a 3D API like OpenGL trough JOGL seems to me like the simplest way to achieve this. Otherwise, if the angle is variable, you'll need some form of software renderer.