Problem Skew animation at an angle

T.Neo

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I am currently developing an addon in Spacecraft 3, that I hope to convert to .dll later. Part of my spacecraft is a series of booms arranged in a somewhat star-like pattern, with a total of twelve (seperation angle between booms of 30 degrees.

I can easily scale the booms that align with the X and Y axes, but due to their angle the other booms squish outwards in a manner that is most certainly not intended.

I'll try to use this substandard diagram to illustrate. Here there are 8 booms (represented by four groups) instead of 12 (represented by 6 groups).



Purple is the start (unextended) position.
Light blue is the end (extended) position.
Yellow is the intended result of a boom being extended at a 45 degree angle.
Green is the ugly end position of a 45 degree angle boom scaled up at the same ratio as the straight booms. Because it is at an angle, scaling by X and Y pull it in directions other than along its length.

I can't use translation and multiple segments (this would result in something like 30 segments per boom, each having to be expressed as a seperate group- they're pretty long booms) and would effectively double my poly count. Vertex animation would be a good bet, but I don't have the slightest clue as to how I would get it to work.

Surely there is some solution to a similar problem, out of all the Sc3 addons that have been created? It'd be quite annoying if something so relatively simple couldn't be supported by anything other than a jury-rigged solution, or vertex animation...
 

Donamy

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I would copy and paste the blue ones and turn them 45 degrees, when you are finished scaling.
 

T.Neo

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This is an animation issue within Orbiter, not a modelling issue. The graphic was quick-and-dirty model in Anim8or, I didn't have much trouble setting up the yellow beam example.

If only there was a way to "copy and paste" within the animation parameters. :(
 

Donamy

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Ah, I see now, but I should think it would be similar to the yellow one only in a different starting point.
 

T.Neo

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I'm slightly confused as to what you mean. Wouldn't that just make the boom more skew than it would be otherwise?
 
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