This is nearly imposssible, and really the only way to do this is either to get a command to do it, Or take a pictre of the object against an empty background and with the camera and object in the same ralative positions and use a small program to chech whether each pixel int the picture is the background colour or not, and if the pixel the mouse is over is not the background color a collision has occured. Or use the command object screen [x/y](object number) and then drawing a box around this point to check for mouse collision
Life is a terminal disease.
You never survive it.