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question open project/idea legacy

henny 06/09/08 - 01:30

hi , i been thinking on this one for a while,

the idea is to use a cam to object track someone on stage and use this to control a moving head spotlight.

can any one give me any pointers, i think i can handle the object track bit to give me X & Y the Z will be a set value of the persons hight. i can do the dmx out bit.

I just need help with all the messy maths bit in the middle that will turn the XYZ of the target in to Pan/Tilt and possible iris to send on to the moving light.

cheers

ian

4 replies 0 new
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link | elliotwoods 06/09/2008 - 01:01

Hey Ian

We did something very similar with some Mac250's about a year ago using a bunch of sine's and cosine's back in Max/MSP
However, at that time i didn't know about vvvv and it's'polar' node.

The polar node will convert between your xyz and pan/tilt angles.

Thankfully the pan/tilt angles are linearly related to the dmx signal so you dont have to do any mad calculations to sort that out. It was simply a case of:

DMX value = current angle / total angle range

If you've got any queries then post them up/pm me

link | Westbam 06/09/2008 - 03:05

Well, since you know where person is (cams) and the movingheads are in fixed position, perhaps THIS POST can help you out :)

link | karistouf 06/09/2008 - 06:20

hi henny, do not forget to pass by Uncle Kalle's modules, especially the 16 bits one...

;-)

link | henny 06/09/2008 - 20:54

cheers for all of the help so far.

ive attached a tweaked version of west's sunonfloor

how can i tweek it so i can use real world units eg floor 10m x 10m , mirror 2 m forward of center at 5 m high ect ........

also how can i tweek the second render to give a pov of the mirror.

cheers

anonymous user login

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