I''m doing movement for sprites and level scrolling in my game based on time, and this is NOT another post asking how to do it! But what I have so far is this: worldY -= timeDiff * LEVEL_SCROLL_SPEED; timeDiff is the difference in milliseconds from the last frame to this frame, and LEVEL_SCROLL_SPEED is, at this point .04f, or 40 pixels per second. WorldY is an int, timeDiff is an int (both unsigned) and LEVEL_SCROLL_SPEED, of course is a float. I''ve heard that conversion from int to float is VERY slow, but I can''t think of another way to do this. Is it acceptable (speed wise) to do it this way? Thanks! ------------------------------ Jonathan Little invader@hushmail.com http://www.crosswinds.net/~uselessknowledge

http://www.velocity.net/~waz/glgamedev/

there's a (sort of) good article talking about it there.

It might help

MENTAL

PS: as long as you dont force C++ to do any divides, everything's fast . In other words, yes it's fine. you might want to speed it up with assembler at a much later date (when the rest of the project is finished).

Edited by - MENTAL on 4/15/00 3:44:27 PM