I want to make a circular image rotate,the I defined an entity with a cylinder model,entrusted it the image.But how coule I use the function bmap_for_entity?Or how can I realize it?

I use another method,the picture is assigned to the entity in the definition.Here is the script:
action roll()
{
while (1)
{
my.roll += 5 ;
my.roll %= 360;
wait (1);
}
}
entity tupian
{
type = <fangxp.png>; //the picture that I want to rotate
layer = 85;
flags = visible;
x = ...;
y = ...;
z = ...;

event = roll;
}
the picture appears on the screen,but the function roll didn't work,in other words the picture doesn't rotate,why?why can't the function do effect?

If you want to rotate the image, just write this
line somewhere in your main :

Code:

---

function main()
{
  ....
  tupian.roll += speed * time_step;
  ....
}

---

Thank you very much,vlau!You are right!

Event function is only triggered by events , eg. collision , scan. Also you cant (I think) assign an action to an event , it should be a function instead , and its good to have the while loops outside the event function. Dont ignore this last text , because you'll have problems in the future