[3D] Revolving particles

[carlos.lunetta]

Hello all

I'm looking for a way to create a revolving particle field.

The easiest way to do it is to revolve the camera (like the demos),
but it creates a lot of problems in my project; the camera must stand
still.

I tried revolving only the field (like rotating a displayObject) but
it does not work (and wouldn't be the best solution)

Therefore, I'm looking for a way to make particles to revolve around a
center point (like an electron revolving around the nucleus). I
couldn't find a suitable action; the vortex example almost does it,
but particles fly away - every time I add a gravity component, they go
away.

The idea is for them to remain on screen, alive.

What would be the best way to achieve this?

Thanks a lot!


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[Allen Chou]

You might want to create an Action3D that makes use of the Vec3D.rotate() method provided in the idv.cjcat.stardust.threeD.geom package. It allows you to calculate the coordinate of a 3D point rotated about an arbitrary axis.

Here's the documentation page for the method:
http://stardust-particle-engine.googlecode.com/svn/trunk/docs/index.html

You can create an initializer, and assigns a "rotation axis (a Vec3D object)" property to the Particle.dictionary property as I mentioned in your previous post. Next, create an Action3D that rotates the position of a particle around its rotation axis.

[carlos.lunetta]

Thanks a lot, I'll try that!

[Allen Chou]

Oops, I gave the wrong link. That's the documentation home page.

This one is the documentation for the Vec3D.rotate() method:
http://stardust-particle-engine.googlecode.com/svn/trunk/docs/idv/cjcat/stardust/threeD/geom/Vec3D.html