Hit Types

Every native that finds something gives its kind in an A3D_HIT and its id in hitid. The callback A3D_OnCollided gives them for what a moving object hit.

Type	Value	hitid	material
A3D_HIT_MAP	0	The model of the map object	The surface of the part hit
A3D_HIT_OBJECT	1	The physics object	0 for spheres and boxes, the surface of the model for model shaped objects
A3D_HIT_STATIC	2	The static object	The surface of the part hit, 0 for boxes and cylinders
A3D_HIT_PLAYER	3	The player	62, the surface PED
A3D_HIT_VEHICLE	4	The vehicle	63, the surface CAR
A3D_HIT_WATER	5	0	0
A3D_HIT_ACTOR	6	The actor	62, the surface PED

A physics object or a static object id needs the tag back before use:

public A3D_OnCollided(Physic:physicid, A3D_HIT:type, hitid, Float:x, Float:y, Float:z, Float:speed) {
    if (type == A3D_HIT_OBJECT) {
        A3D_SetVelocity(Physic:hitid, 0.0, 0.0, 0.0);
    }

    return 1;
}

A moving object shaped like a model moves with one surface, the one of the first part of its collision. A static object keeps the surface of each part. See Surfaces.