[AbyssMorgan]

3DTryg. It does not require plug-ins.

PHP код:

public OnPlayerGiveDamage(playerid, damagedid, Float:amount, weaponid, bodypart){
    if(damagedid != INVALID_PLAYER_ID){
        new Float:x,Float:y,Float:z, 
            Float:tx,Float:ty,Float:tz, 
            Float:rx,Float:rz,Float:offset_rz; 
        GetPlayerPos(damagedid,x,y,z); 
        GetPlayerFacingAngle(damagedid,offset_rz); 
        GetPlayerPos(playerid,tx,ty,tz); 
        GetRotationFor2Point3D(x,y,z,tx,ty,tz,rx,rz); 
        CompRotationFloat(rz-offset_rz,rz); 
        //compare rz
        if((rz >= 0.0 && rz <= 45.0) || (rz >= 315.0 && rz <= 360.0)){
            //front of skin
            
        } else if(rz >= 45.0 && rz <= 135.0){
            //right of skin
            
        } else if(rz >= 135.0 && rz <= 225.0){
            //back of skin
        } else if(rz >= 225.0 && rz <= 315.0){
            //left of skin
            
        }
    }
    
    return 1;
}