I'm a bit puzzled by the physics of the standard helicopter vehicle in the FreeSDK. In particular, the dampening effect.

If, using flowgraph, I apply a horizontal action impulse... the helicopter will move sideways/forward forever - there is no dampening effect.VIDEO: http://www.youtube.com/watch?v=RoE2ypBV ... e=youtu.be

If, using an identical FG, I apply a vertical action impulse... the helicopter will move up/down, but slows and then stops after a couple of seconds - there is a dampening effect. VIDEO: http://www.youtube.com/watch?v=uTlsZLxy ... e=youtu.be

I've also tried with the helicopter inside a gravity sphere (so, no engine effect, theoretically) and it works identically to the videos.

I actually like the vertical dampening effect, and I've tried with the vehicle editor, but I haven't found a way to apply a horizontal dampening effect to an action impulse.

So, geniuses, any thoughts?

vertical dampening effect you told is caused by gravity ,not resistance.
other damping effect you want,must add by yourself.

thanks Oopzloop, but imho it isn't caused by gravity, for a few reasons.

- I tried the helicopter in a gravity sphere, in zero G, it makes no difference
- dampening works exactly the same, both upwards and downwards

seems they have some addition work on it......

Did you ever solve this? I just got into the code a bit more, and I notice there is a limit on the height of the helicopter. So, despite the flownode code, there may be overriding actions to keep it from exceeding the height threshold (in a dampening sort of way).. where as there are no limits to moving horizontally.

hiya SR, thanks, but the height limit doesn't seem to be causing it:

because the dampening effect is the same with a downwards impulse. The mystery continues...

I took a quick look at lua to make sure it's not happening there - but the the "VehicleMovementHelicopter.cpp" may have an answer?



I just looked quick, but m_velDamp is initialized to 0.0f in the constructor and in my look, I only saw it changed in the AI portions of code.

thank you, excellent thinking SR, I thought you had solved it... so I changed m_velDamp to 1.0f (and even replaced it with 1.0f) so that I could get that sweet damping effect in horizontal movement


Nothing changed, so I set everything to 0.0f.

But dammit, still exactly the same horiz and vert movement, both inside and outside a gravity sphere.

Puzzling

hrm.. u tried a couple values I suppose too.. Can you CryLogAlways() the dampening value and the chopper's horiz veloctiy while it executes to see if it's not being overridden..? Did you try setting the vertical to 0.0f to see if it stops dampening? I plan on getting to more vehicle stuff in a few months, if you don't solve it before then I'll check it out more, or if I come across anything I'll be sure to let you know.

thanks! yeah, I tried the values of both horiz and vert dampening at 1.0f and 0.0f... but no change in anything.

As you say, it is probably being overridden somewhere. I'm on something else now, but I'll test it one of these days.