how this effect is possible???

[djlorenz]

surfing on youtube i found this... take a look from begin to 0.18...



how this laser effect is possible? is a camera bug?
thanks!

[DZ]

It's just caused by the camera. Would be an awesome effect, if only we could slow light down a little bit!

[djlorenz]

i was thinking the same... great impossible effect

[RGB LASER VERKOOP]

camera can not handle it, i have she same when i make video's at a special scan speed.
i use a sony cybershot Exmore R, but still have this FX

i not like it, becourse when a beam is not a straight line, it is allways fake or bad camera work.
light beams are allways straigth

http://youtu.be/n-kbNtOlaKA

[White-Light]

It's the effect of the rolling shutter.

I too love this effect but unfortunately light travels at 299,792,458 m / s.

Which all in means its impossible to turn the laser off before the light has gone the full length out over the audience. To turn it off to give varying lengths of beam would require electronics, never mind modulation, far beyond anything available to day.

[dnar]

^^^ What White-Light said ^^^

I get this with stills using fast exposure also, and it can look quite spectacular as in the photo I took from my equipment.

IMG_1835.jpg

[-bart-]

This sums it up pretty nicely.

This especially happens when the frame rate of the camera is close to the frame rate of the projector.

[LaNeK779]

light beams are allways straigth

i have a black hole (the desktop edition, if you have a desk that's big enough) and i use it to curve light beams.
particularly interesting when i use it on top of scan through effects

[dnar]

i have a black hole (the desktop edition, if you have a desk that's big enough) and i use it to curve light beams.
particularly interesting when i use it on top of scan through effects

Cool! I can see it now, "Event Horizon Events".

[LaNeK779]

yeah, a slightly different version of "the restaurant at the end of the universe"

Event Horizon Events
"bending time and space to suit your needs"

now for a killer logo by sir jon daystar

[dnar]

milliway.gif

Above all things, DON'T PANIC.

[-bart-]

i have a black hole (the desktop edition, if you have a desk that's big enough) and i use it to curve light beams.
particularly interesting when i use it on top of scan through effects

I have two in a XY-setup, too bad it lacks a matching type III Kardashev scale powersupply, to modulate the masses.

[Stoney3K]

^^^ What White-Light said ^^^

I get this with stills using fast exposure also, and it can look quite spectacular as in the photo I took from my equipment.

IMG_1835.jpg

So you're trying to claim, with a straight face, that you don't have a working Milennium Falcon parked in your garage after all?

I have two in a XY-setup, too bad it lacks a matching type III Kardashev scale powersupply, to modulate the masses.

Oh, so you haven't found out about the new "Cerberus" model they installed on the Normandy yet? I mean, the mass effect field takes a lot of hassle out of your hands... the Hawking ray shielding on those old models were an absolute pain.

[mixedgas]

I have extended it to Aviation:

http://www.youtube.com/watch?v=2pbYKDW0myU

Patent applied for, really saves fuel on the Hind...

Stiffening the rotor blades, for static mode, however, was expensive.

Steve

[dnar]

I have two in a XY-setup, too bad it lacks a matching type III Kardashev scale powersupply, to modulate the masses.

Orthogonal Black Holes?

Multidimensional cosmological, static spherically symmetric and Euclidean configurations are described in a unified way for gravity interacting with several dilatonic fields and antisymmetric forms, associated with electric and magnetic p-branes. Exact solutions are obtained when certain vectors, built from the input parameters of the model, are either orthogonal in the minisuperspace, or form mutually orthogonal subsystems. Some properties of black-hole solutions are indicated, in particular, a no-hair-type theorem and restrictions emerging in models with multiple times. From the non-existence of Lorentzian wormholes, a universal restriction is obtained, applicable to orthogonal or block-orthogonal subsystems of any p-brane systems. Euclidean wormhole solutions are found, their actions and radii are explicitly calculated.

[-bart-]

Eh, you've lost me after the radii part.

[LaNeK779]

Eh, you've lost me after the radii part.

are you telling us that you were actually keeping track before the radii part???

[Xytrell]

I used to get this effect on an older camera









And another extension into aviation:

[Psi]

You could probably do it if you had 1000 2mW projectors all mounted at different locations and could intersected all the beams to plot a movable 2W spot in real time.

[Roy G. Biv]

Following a link from the aviation video above:



I wonder if it was inflated ...

[jtnichol]

Wow that is cool! Thanks for posting! Boy those Framerates are too tightly synced or out of sync....lol

[-bart-]

In that's not a rolling shutter effect.
It is too perfect to be 'accidental'.
Microphone, BPF, VCO, divider, PLL, and camera with genlock crammed together will do the trick.

[Stoney3K]

In that's not a rolling shutter effect.
Is to perfect to be 'accidental'.
Microphone, BPF, VCO, divider, PLL, and camera with genlock crammed together will do the trick.

It's harder to pull off than you think. When you have the camera genlocked to the rotor RPM, you'll need to constantly keep dropping shutter angle as the helo takes off and the rotor spools up, to avoid introducing motion blur.

Lower shutter angles mean less exposure, so you're gonna need a LOT of light (or a really fast lens) and some lightning fast iris to compensate and maintain the lighting conditions like they did in this clip.

[mixedgas]

Bart is sort of correct.

Its internal in the cameras. We ran into that in some Sony cameras where I used to work. Sony has a system in the DSP in camcorders that moves the camera off stroboscopic events by a fraction of a frame. When we tried to film stoboscopic illumination in the lab, the camera would move off the repetitive bright events. I had to induce dither in our strobe circuit to compensate.I took a sync stripper chip and used it to lock our strobes to the camera. I had to add a slipping counter to the strobe side of the sync chip.

Every other camera in the lab I could genlock or lock the strobes to the video with a sync chip. But not the Sony camcorders.


Then a guy with a broadcast grade Sony came to visit, and he switched on a mode that was "LOCK TO FLICKER", and low and behold, he could film locked to the strobe... So I suspect the camera had the lock to flicker mode, was set to rolling shutter, and the choppers FADEC engine control is constant RPM.

The turbines try to run at pretty close to constant speed and 90 to 95% RPM in flight in most Helos.The rotor speed, NR does change. I learned that building the projection optics for a helo sim. I spent quite a bit of time flying the sim to check my work.
I'm sure Stuka can confirm that.

If Not convinced, Read Shawn Coyle's book, "Cyclic and Collective", Shawn is a personal friend.
Shawn covers the helo hardware very well.

Some times, as in the case of the C130 rotors, its the rolling shutter. In the case of the Hind, I suspect Fadec plus the camera control DSP. No one set out to lock to the Hind, it just happened to be the right combination of camera software and a constant speed rotor (well, as close as you can get to one)

The Hercules turbo-props run at a constant speed, they change the pitch of the props to vary thrust. So its probably easy to find some wierd shutter rates that sample the motion.

Steve

[Cade]

Hmm,....
The helo blades synced with the shutter speed looks cool, and Shawn Coyle's book still doesn't help to clarify (for me) that we are NOT catching the "tail-ends" of the beams:



Here's the source (un-slowed) video that I shot at the BALEM last month:

http://fs13n4.sendspace.com/dl/50caf...c/IMG_0146.MOV

or

http://www.mediafire.com/?7z3c3qrhdddzg6a