. It is not clear to me how the people who made the game above solved that problem.
void grass_event_function()
{
if(event_type == EVENT_FRAME)
{
my->skill41 = floatv(wind_x + my->skill1);
my->skill41 = my->skill41 - 0.1 * sinv(16 * total_ticks);
my->skill42 = floatv(wind_y + my->skill2);
my->skill42 = my->skill42 - 0.1 * sinv(16 * total_ticks);
my->skill43 = floatv(wind_force);
my->skill43 = my->skill43 - 0.1 * sinv(16 * total_ticks);
my->skill44 = floatv(wind_amplitude);
my->skill44 = my->skill44 - 0.1 * sinv(16 * total_ticks);
}
}
action fx_animTree()
{
set(my, PASSABLE);
my->material = mtl_animTree;
// randomness for each grass
my->skill1 = 1 + random(2);
my->skill2 = 1 + random(2);
my->emask |= ENABLE_FRAME;
my->event = grass_event_function;
}
