Rotating circle problem?

[steviobee]

Hi, this may be really obvious but am trying to squash a circle to a sort of UFO shape and rotate it so that the UFO remains level and the points rotate around the flattened circle and not the entire shape is rotated?
This is probably harder to explain on here but hope this makes sense...



Hope the picture helps?

[colouredmirrorball]

What software are you using? In LSX you could use a SizeY event, or a RotateX event.

[The_Doctor]

That amounts to a detuned modulation, so that some gap or point of brighter light is moving round the rim. The number of cycles of point rotation round the rim must be an integer relation to your scan speed to get the points sitting still, then detune up or down slightly to set them slowly moving around the rim one way or the other. Plot it all as a Lissajous circle with the Y axis shortened a lot to make it look like it's seen from slightly above or below horizontal.

Whether this is easy to do in something that plots frames with fixed points I don't know, because it's closer to what an abstract generator does, or what my rotating polygon generator does. Judging by the things I've seen done with LSX, it's doable.

[steviobee]

Doh, sorry using Beyond.

[The_Doctor]

Well, do you understand what needs to happen? There might be more than one way to do it. The most fluent way will need to take into account the scan speed like I said before... Something like detuning of the colour intensity mod speed while keeping the flattened Lissajous circle running as a constant.

[laserist]

Think of it this way - if you could rotate a circle made up of 16 points in the z axis and then reduce the gain on the y axis you're golden...

[-bart-]

I take it the circle has some colors or dots on it.
Otherwise rotating it would not make much sense.

First rotate it around the z axis with a lin osc. eff 0-360. Then give it a key eff. y scale of 30%.

[-bart-]

Here are eight variations to achieve the same effect (if I understand your problem correctly).


example.zip

[steviobee]

Thanks guys for showing me a few options here, I have achieved what I was after. And thanks Bart for the examples, I presume they were created at the LEM, I feel privileged :-) it looked bloody good, I hope to make one over one day....