set_bounds
Description:
Sets the initial and final levels of the opacity applied by this on each actor it controls.
Parameters:
| this | |
| opacity_start | minimum level of opacity | 
| opacity_end | maximum level of opacity | 
Sets the initial and final levels of the opacity applied by this on each actor it controls.
| this | |
| opacity_start | minimum level of opacity | 
| opacity_end | maximum level of opacity |