Heartbeat particle simulation question.

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Old 03 March 2013   #1
Heartbeat particle simulation question.

Hey Everybody. I am working on a little particle animation. I created a vein and in that vein you can see the blood-cells moving. Now I would like to get the particles moving as if they are pushed forward by the heartbeat. You can see an example of what I try to create around 30sec in this youtube video: http://www.youtube.com/watch?v=ZumCN9qbIpk

I have the particles moving along a path using Speed by Icon but I can't seem to get the pumping effect... Anyone that can help me out here?

Old 03 March 2013   #2
it'll take some jury rigging but you can do this with a tube.

take the path spline, make a copy and extend the ends out of view, and connect the ends, making a closed loop.

Then create a cylinder(no caps on either end) and path deform it on to that spline. Make sure the tube is long enough that the ends touch. Use particle flow to position particles on the object, lock on emitter and set it to animated shape.

Use the surface location and off set the minimum till the cells are even inside the tube.

Then just animate the tube endlessly following the path.

The beauty is that you get the pulsing, you can modify the overall speed changing without multiple sources and avoiding overlapping of cells and gaps.

You can also modify the volume with an ffd assuming you're illustrating vessel dilation or artery clogging. Over all it's a pretty dynamic method.
[Invivo Animation Reel]
Old 03 March 2013   #3
small diagram:
Attached Images
File Type: jpg Untitled-1.jpg (72.1 KB, 16 views)
[Invivo Animation Reel]
Old 03 March 2013   #4
Quote: I have the particles moving along a path using Speed by Icon but I can't seem to get the pumping effect... Anyone that can help me out here?
Care to explain your set up, especially the Speed by Icon part?
Old 03 March 2013   #5
The way I have done this before is to use a wind to move the cells , and animate the wind strength in a loop going up and down. Combined with a drag you get a nice effect.
Old 03 March 2013   #6
Thanks everybody I used the technique of DanHibiki worked like a charm!
Old 03 March 2013   #7
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