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Old 09-29-2007, 11:30 AM #1
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Default Circular pattern

Once I saw a lasershow (this was an outside show in a valley, scanner was placed on castle wall on a hill) one of the patterns where multiple moving circles (which seemed to be perfect circles) projected on surfaces from 10 to 100 ft from the source.
I think the diameters of the circles were about 3 ft at 40ft from the source and the line of the cirles about 6" thick , the center was dark

How do you create such a pattern?
Can you do this with relatively cheap equipment or do you need high-end scanners to do this?



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Old 09-29-2007, 12:42 PM #2
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Default Re: Circular pattern

well there is 2 ways they could have done that, one way is to simply "multiply" a single circle, and the second would have been a high end scanner system, but considering it was an outside show, i'd say proffesional
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Old 09-29-2007, 08:50 PM #3
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Default Re: Circular pattern

But how do you create a circular pattern in the first place? Is it something you place in the path of the beam or is it just plotted point by point (very fast scanning would be needed then)

I don't know exactly how lasershows work, as far as I know patterns are created by two computer controlled mirrors (one for the X and one for the Y position) which can move very fast to make it look like one image.
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Old 09-29-2007, 09:23 PM #4
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Default Re: Circular pattern

Well, just one circle is really easy - take an angled mirror, spin it and point your pointer to it. That way, the dot makes a circle, if rotated fast enough, you have a circle.

Still, what you mean by "multiple circles" is not 100% clear to me. Do you mean several separate circles or one long twirly line?

Maybe check out the thread about the hand-held projector in "Experiments and modifications"

Or, alternatively the "single motor tunnel" thread.
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Old 09-30-2007, 08:17 AM #5
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Default Re: Circular pattern

An out door that size would have a very high tech piece of kit, the scanner is more than likely scanning at 40kpps and up, the laser would be about 3 or 4 watt, nothing less then 1 watt for outdoor use. The multiple circle effect is a created by the scanner scanning at high speed, you might notice a flicker in the effect. Outdoor show rarely make use of filters or effect generators, scanner produce a high quality effect that is needed.
Hope that helps
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Old 09-30-2007, 08:39 AM #6
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Default Re: Circular pattern

yeah it is most likely a proffesional thing, as it would have to be ATLEAST 1W to be seen outside!
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Old 09-30-2007, 01:59 PM #7
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Default Re: Circular pattern

at that distance.. your talking 4 watts or so and about $50k worth of laser scanner to do that... sounds cool.
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Old 10-01-2007, 07:54 AM #8
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Default Re: Circular pattern

:P i wish i had a hand held that powerful, i wish they made hand helds that powerful. 4 watts, i could slice cars into two MWAHAHAHAHAHAHAHAHA ;D
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Old 10-01-2007, 01:07 PM #9
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Default Re: Circular pattern

...but it would take you longer than if you were using nail clippers to do so

I think 4W is sort of in the "boring" hole (don't hit me! They're definitely not boring!!!), as weaker ones have basically the same effects (see the beam, burn/cut stuff, albeit slower), but the 4W and his brothers are still not powerful enough to do some extreme "badass"-burning, like cut through sheets of metal etc...


(Although a handheld cutting through metal plates would be ridiculously expensive, if even feasible, and extremely dangerous, so yeah, little use. But still cool, esp. if you can create mid-air glowing balls, i.e. ionisation).
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Old 10-07-2007, 01:20 PM #10
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Default Re: Circular pattern

Quote:
Originally Posted by philguy
Well, just one circle is really easy - take an angled mirror, spin it and point your pointer to it. That way, the dot makes a circle, if rotated fast enough, you have a circle.

Still, what you mean by "multiple circles" is not 100% clear to me. Do you mean several separate circles or one long twirly line?

Maybe check out the thread about the hand-held projector in "Experiments and modifications"

Or, alternatively the "single motor tunnel" thread.

It looked like multiple separate circles,
I've searched for pictures and the closest match I found was this one (the ones i saw were actually green and moving all together in the same direction)

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Circular pattern-pallete_circles1.jpg  
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Old 10-07-2007, 02:50 PM #11
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Default Re: Circular pattern

Like captain scarlet, in the start where two circles of light from the mysterons would follow him?

But more circles, O O O O O moving in unison? left to right, up and down?
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Old 10-07-2007, 03:29 PM #12
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Default Re: Circular pattern




It was more like.

O O O O O O
O O O O O
O O O O O O
O O O O O

Moved all in the same direction, after a few seconds the direction changed.(both up/down left/right)
But the distance between the circles never changed.
As if the circles were created by one single laser/projector.
Of course there were many other patterns and because of the smoke of the fireworks the beam were very visible.
No doubt they were using professional equipment but i wondered if it was possible to create this single pattern with relatively cheap equipment (but i'm afraid is isn't)

btw: this lasershow was in Vianden, Luxemburg, sound & light event. (which is every august at the Vianden Castle)
It was a combination of music, fireworks and lasers.

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