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# webcam > VVVV > DMX > Moving Light

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
This is a legacy thread which was closed after one year of inactivity. Information provided in this thread may not be valid for the latest version of vvvv. If you have questions on this topic, you might consider opening a new thread.

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

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