I just strated using blender game engine. I m making a game in which a ball or sphere move but i want to move it by the button on the screen. Which i made in another scene by overlay with main game screen. Can any one give me idea how do it. If i press the button with mouse ball should move in any dirction.
Possible example: This will move the ball in one direction, if you press the button. Welcome to the Blender StackExchange!
To detect the click on your button add a mouse over sensor and a left button sensor to your button. Combine them with the default AND controller and use a message actuator to send a message e.g. "moving" to your ball. Make sure that one of the Sensors has true-level-triggering enabled, so your ball keeps moving while you keep pressing.