It is possible to create a small planet ? i beleave the a5 engine treats gravity only to a single vector (down), i want entities to wallk on this planet and be able to trow stuff into orbit, the engine treats maps as flat worlds.. if i do a sphere and place a entitie over, he will fall on the edge, and not be grabed by the planet's gravity how do i simulate this on A5 ??

Theoretically, what you are wanting to do is entirely possible.

You will want to make use of the scan function to simulate gravity.

Look in the manual under scan, maybe even scan_floor. You could use this to keep your players on the sphere.

*Hope this Helps*

A5 does not treat levels as flat, gravity is merely part of the template scripts.

You will have to program all the gravity and space physics yourself, it will be complex but its possible.

if you try using trace, and trace from the spaceship to the planets center, you will have the distance to the planet which you can use to determine pull strength, and use vec_to_angle to find the direction to the planet. You would need forces for the ships thrust etc, and separate forces for gravity ie
ent_move(thrust.x,gravitypull.x);
I'm afraid I cant work out how to move it in the direction of the planet, but it is possible.

SpaceJim has a pretty good handle on space! (Surprise, surprise)

Just to embelish, you don't need to do a trace at all to determine gravity.
just use a vec_dist command on the player.pos and planet.pos to get the distance.

From the distance away, derive the force of gravity.

Take the force, and convert it to a vector.

Use the vec_rotate command to point your gravity vector at the planet.

apply this rotated force to your entity being influenced by gravity.

I'll leave the details to you, but I hope this gets you started!

- WildCat