How is this Helicopter flying?
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chopper,rotor,flight,copter,blades,rotors,illusion How is this Helicopter flying?
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This is something you learn when you try to model rotary motion in 3D, the most obvious thing would be to just create a main rotor and spin it, however this doesn't give that washed out blade spin you see in real life. So instead of that you create two layers, one of the main rotors and another of a flat 2D texture for the actual helo rotor motion then animate a switch between both.
Next time you fly a chopper in BF2, look at the blades prior to and after take off. You will see the same effect.
so the camera captures the blades at each position - then what?
is the whole clip at slow motion?
i know my brain is.
cheers.
1) optical effects you mentioned would be true only if it was stationary and the blades remained at the EXACT same rate of rotation, assuming the camera had somehow magically found the precise shutter speed to match the positions of the blades. This is not true as the Hind is yawing/pitching and gaining/losing height - this would require changes in the throttle, hence changing the speed of rotation and de-synchronising it with the camera shutter speed.
2) Notice how the model seems to swing right to left, then right again, as though from a point high above. It's not until it comes to a stop that the 'crane' is raised.
Very impressive model though! It must be huge... and even comes with retractable landing gear!
However, I'm don't know if I buy the other options proposed... I'm going with Magneto having a fun day.
http://en.wikipedia.org/wiki/Wagon-wheel_effect
This youtube movie shows a stroboscopic effect when filming a true Hind.
http://www.youtube.com/v/eLOXRQzkFCc
Using a high grain film or digital could produce what you're seeing on the above sift... unfortunately... when flying like that, the pilot would be changing the rpms personally, or at least the different air pressures would "turn" the rotor with respect to the camera shutter.
I say rendered using the soundtrack from the youtube movie I linked to.
The angle of the blades clearly translate into the chopper's movement, my opinion its an optical effect caused by an intentionally synched camera.
"Yeah, there's no way that's an optical effect. I agree with garsh and BoneyD. There would be major blurring on the blades, and the rotation would be pretty obvious and steady as the throttle changes, like it does when you look at wheels on a car."
Unlike the props on a plane and wheels on a car, the blades on a helicopter do not change RPM during flight. They stay at a constant RPM, and the rotor is tilted and the blade angle is adjusted for maneuvering.
You see this effect a lot on digital camcorders with a "sports" mode. I took a friend flying once and he brought his Sony camcorder. When he had it in normal mode, the props in the video were blurred, but when he switched it to sports mode, it recorded at a higher FPS and in the video the prop appeared to be slowly spinning backwards.
No camera in the world being casually handheld can freeze that kind of action with absolutely NO differential effects seen between the hub of the rotor and the far end.
It's a 3D MODEL WHICH HAS BEEN TRADED ON THE INTERNET SINCE THE EARLY 1990's:
http://images.google.com/images?hl=en&q=hind+24+3d+model&gbv=2
Additionally this whole thing would take about a day to make for someone with skills. Dont let the little specular effects and such fool you.
1) get HDR 360 degree panoramic image of the sky. If you dont have one, let Vue-6 render one for you automatically.
2) use the HDR image as the background, and also as the light source
3) place a specular "Sun" light somewhere matching up with the HDR location
4) take ancient moldy Hind 3D model from your most oldest ancient CDR on your most dusty bookshelf
5) use a flavor of hind paint scheme READY TO GO:
http://www.turbosquid.com/Search/Index.cfm?FuseAction=ProcessSearch&intStartRow=1&istSearchKey=hind&intMediaType=-1
(or roll your own)
6) flop it around in the viewport, render to small movie, apply sound effects
With a low shutter speed, each blade would move a significant distance while the shutter was open, resulting in a blurred (though apparently stationary) blade.
For the record, I believe it's entirely possible that this video is legitimate. As long as there is a (motion picture) camera capable of a high-enough shutter speed to capture the blade tips then the rest is academic.
It could be rendered, but I doubt it.
If you track down the original post there are actually two videos. The second includes a flyover of a crowded airstrip indicating that this probably took place at an airshow.