rectangular--->iso

You need to do your graphics isometric to begin with. I don''t believe there is any way to rotate a rectangular graphic so that it becomes iso. But, if you are doing your graphics in 3D then you can rotate your camera. Other than that . . .




Think outside the dodecahedron

Hm... most graphics programs allow full rotation and skewing... With a bit playing around it should be no problem.

- JQ, PWC Software
"programming is all about wasting time" -me

You could write your own custom blit function. Have a look at the article at www.mr-gamemaker.co.uk for an example.

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Take a look at the excellent article on using Direct3d for 2d games. You can find it under the "Previously featured articles" link on the main page. It shows you how to do exactly what you''re asking using hardware accelleration.
Good luck!