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pixelshaker
03-13-2007, 11:56 AM
Hello,

i have a scene with pre-placed particles and want to "suck" them into a flexible pipe which moves along them. How can i achieve this.

The Curve Flow Effect only works with its own emitter and doesnt affects exisiting particles.

And honestly i dont have any idea how to set up a goal based solution which in my opinion is the right way. Sure i can create a curve and define it as a Goal-Object but then the particles stuck to each vertex at the same time. I know i have to build a expression for GoalU or GoalPP but i dont have the knowlege right now :(

Any ideas ?
Als
03-13-2007, 02:32 PM
Check dynamamics thread few pages back, there was the same question...


Als
pixelshaker
03-13-2007, 02:36 PM
didnīt see it.. i am looking again
Als
03-14-2007, 04:52 AM
Explain more about the flexible pipe. If you are trying to make vaccum cleaner effect, what you want to do with particles? Should they get into the pipe and get suck inside and continue moving inside the pipe? Please just explain more, and maybe draw a picture what you need.
You can do this with goalPP, but the other way around. Particles could be stuck to your surface with goalPP (if particles need to be stuck on the moving surface), and if pipe comes closer then goalPP goes to zero, thus releasing the particles from the greep with their present position, and sucked with some field, for example newton field, or fan.
To do this without expression, if particles are just on the ground which doesn't move, you just need a field to pick them up. This expression is really close to the tornado one, so check that thread too.
Otherwise you can just trying doing this with two fields. One strong enough to pull them from position and then another to get them to go straight up.
For the start I would try using volume axis field. It has values which can simulate vaccuming up. Around axis can get them do a bit of swirling action, and direction can move them in needed direction. You need to use cylinder volume shape, to limit range, and animate field with your vacuum pipe movement.
You can also hold particles with some strong drag field.

The curve flow thread which I mentioned would work by having particles on curve flow.
Curve would be inside your vacuum pipe, and particles moving inside the pipe, starting from a bit outside of pipe, going inside and up. Then you could make newton field, and use curve flow particles as a source of field. Then flow particles would attract your "dust" particles and suck them in and move them with the flow. By increasing rate of emission in curve flow, you would have stronger field.

Hope this gives you some ideas...


Als
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03-14-2007, 04:52 AM
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