VECTOR temp_pos;
VECTOR particle_vel;

vec_set(temp_pos,nullvector); // this needs not that much lines :P
temp_pos.x = 20 * time_step;  //  "   "   "   "   "   "   "   "

vec_set(particle_vel,temp_pos);
vec_rotate(particle_vel,flamethrower.pan) //flamethrower= pointer to the flamethrower entity
                                          //(i think the flamethrower always has the same
                                          //angle, the particles fly)

vec_set(p.vel_x,particle_vel);

vec_rotate(temp_pos.x,camera.pan);

vec_set(p.vel_x,temp_pos.x);
vec_rotate(temp_pos.x,camera.pan);

function fade_flames(PARTICLE* p)
{
   p.alpha += 1.5 * time_step;
   p.size += 1 * time_step;
   if(p.alpha < 0){p.lifespan = 0;}
}
function flames(PARTICLE* p)
{
   VECTOR vTemp;
   vTemp.x = 50;
   vTemp.y = 0;
   vTemp.z = 0;
   vec_rotate(vTemp.x,camera.pan);
   vec_add(p.vel_x,vTemp.x); // tried with vec_set and separately too
   p.bmap = flame_tga;
   p.size = 1 + random(2);
   p.alpha = 100;
   set(p,BRIGHT|MOVE|TRANSLUCENT);
   p.event = fade_flames;
}