Interacting with surface

[Judicator]

Hi, guys.

I have a task and I need to figure out how to make it.
Basically I need to make a cell membrane, which is made from lots of lipids (I use ICE particles for that). Of course they don't fly around in space, so I use "stick to location". So far so good.
The problem starts here. I need to animate a protein passing through that membrane, so basically particles should always stick to location, maybe move on it a bit, but when the protein passes - they have to move over to let it through, and after that go to original position. How the hell do I do that?
Tried with forces, with collisions, but still cannot make it work.

Thanks in advance.

[SamHowell]

Sounds complex, have you considered faking it?

Something like this?

https://dl.dropboxusercontent.com/u/488 ... ing_it.mov

It's still ICE (partly) but without actual collision. A lot easier to adapt and work with.

[Bullit]

States?
Syflex cloth?

[gotchee]

Here is what i would do...
It's using an unsimulated approach. Although, through the crossproduct there is a swirly kind of motion when passing through the membrane, but maybe my example can serve as inspiration.

Hope this helps

P.S.: Just in case you're not using it already, but i find Eric Mootz' emTools-ToolSet very handy for distributing the e.g. lipids equally on the surface (see: http://www.mootzoid.com/wb/pages/softim ... mtools.php)

[Judicator]

Sounds complex, have you considered faking it?

Something like this?

https://dl.dropboxusercontent.com/u/488 ... ing_it.mov

It's still ICE (partly) but without actual collision. A lot easier to adapt and work with.

That's exactly what I need. Though I cannot achieve the same result. Even when using your picture as a reference, my particles move a bit on a sphere (membrane), while yours are still, and they do not move away from the protein.
What could I miss? Some settings maybe?

[SamHowell]

Sounds complex, have you considered faking it?

Something like this?

https://dl.dropboxusercontent.com/u/488 ... ing_it.mov

It's still ICE (partly) but without actual collision. A lot easier to adapt and work with.

That's exactly what I need. Though I cannot achieve the same result. Even when using your picture as a reference, my particles move a bit on a sphere (membrane), while yours are still, and they do not move away from the protein.
What could I miss? Some settings maybe?

Oh sorry, I should have posted the scene as well. It's just some ICE spheres staying on the emit location and then just animating the emit mesh with envelope thingy's. A lot easier to adapt if a client (even if that client is yourself) needs changes done quickly.

Here you go https://dl.dropboxusercontent.com/u/488 ... t_v001.scn