I use c_scan function. The manual writes this:

Is there a workaround solution to catch the entity if its origin doesn't lie within the cone? The 3D GS version is 7.80.

You could simply increase the scan range and decide depending on their size how to go on. Or you write your own c_scan function:

you = ent_next(NULL);
while(you) {
if(vec_dist(your.x,...) < 500+your.max_x) {
just do it
}
you = ent_next(you);
}

If you need a scan cone in your own scan function, calculate the angle from the scan position to the entity and compare it to the scan direction.

Although i studied the manual, i am afraid i don't understand how works the c_scan.
For example, what does do this: mydist=c_scan(camera.x,camera.pan,vector(12,12,200),IGNORE_ME|SCAN_ENTS);
I think, based on the manual this will not detect an entity if the c_scan doesn't see the object's origin.
And if i increase the range, the situation will be the same, if the origin is not in the cone. Fix me, if the range is not the difference between the camera and the entity.
And yes, i need a cone.

c_scan can only return one entity. And the returned distance is the distance to the next entity. If no entity is in scan range, no distance is returned. If you need to scan all entities, you must use events. Look up ENABLE_DETECT and ENABLE_SCAN in the manual.

That is OK, the same info is in the manual.
I would like to get more help, if possible.

I've already answered your question:



For example your initial scan range is 500. You now increase this value by e.g. 500 quants. Either in the entity event function or next to the c_scan instruction you check the entity's size, for instance according to its max_x value if the entity is symmetrical.
If the returned distance is 777 and 777 < 500+entity.max_x is true, the entity touches the scan cone.
Alternatively you could write your own function with (!) scan cone as I've posted earlier.

Increasing the range helps me no, if i get 0 as returned distance. So i can't use the "777 < 500+entity.max_x is true" relation.
The reason is the origin of the entity is not in the cone.
I can increase the range even 50000, result will be always 0.

Then how big is your entity?

EDIT: I think I understood your problem. The problem is not the distance but the scan width, right?

Yeah the problem is the scan width. I am sorry, i wasn't enough clear.

The size of entity on the screen is cca. 7x7x7 cm, dunno in pixels...
I use the mydist=c_scan(camera.x,camera.pan,vector(12,12,200),IGNORE_ME|SCAN_ENTS); statement to detect objects.

The sector/ cone is really small, why don't you just make it bigger?
For example: vector(90,90,200). If you want such a slim scan cone, c_trace would may be better IMO.