Animating pulsing artery

[JoelOtron]

What exactly are you trying to achieve? Are you trying to animate a pulsing artery that you've already modelled or are you asking how to create one as well?

Coincidentally, I actually had to create a bulging blood vessel earlier today (still in progress) for a project. (It will be composited into a mostly 2-d animation)

http://www.joeldubin.net/uploads/test/vessel%20bulge_sor3.mov

Please be specific about what you are trying to achieve and perhaps I could help you.

[manlio]

Hi JoelD, I want to animate an artery, no matter which way is modeled but I want some advice about specific technique for pulsing it at heart beat rate . In particular I want to render the blood flow from the inner view of artery (the artery is like a background). I hope you can understand my target. Sorry for my poor english.
Thanks for your help.

P.s. I have seen your animation, the effect I want to achieve is similar, but maybe I want to add something like a subtle wave movement to the artery.

[JoelOtron]

Originally posted by manlio
Hi JoelD, I want to animate an artery, no matter which way is modeled but I want some advice about specific technique for pulsing it at heart beat rate . In particular I want to render the blood flow from the inner view of artery (the artery is like a background). I hope you can understand my target. Sorry for my poor english.
Thanks for your help.

P.s. I have seen your animation, the effect I want to achieve is similar, but maybe I want to add something like a subtle wave movement to the artery.


Hmmmm.

So you are showing a cross section of the artery and want the blood to pulse?

I just used the bulge deformer to animate the expanding vessel. You could do the same, and rather than animating the parameters of the bulge, aimate the motion of the bulge moving through. Heres a similar thing I did to animate peristalsis in the small intestine, unfortunately its at the very end to a 54 second clip--so you have to wait through all the other stuff first.

Its 4.5 mb, QT sorenson 3. Think I set it up for streaming, but it might take a while to load.

http://www.joeldubin.net/assets/movies/pharma_1.mov

Its a bit weird--never was happy with the way the pulsing worked--but you get the idea. I used a series of several bulge deformers in a row. Every other deformer squeezed, while the ones between bulged--and then they would switch. I moved that system of 5 or 6 deformers through the lathed cross section. I will try to create something later today if I get a chance.

[manlio]

Thank you very much Joel. I'm downloading your streaming video, but what you have told me is quite clear. Tonight I will make some test. Regards. :beer:

[JoelOtron]

Now that I'm obsessed--heres another sample using the FFD deformer. theres some weird bending of the artery, but I'm sure that could be fixed with a litle time.

http://www.joeldubin.net/uploads/test/pulse_render.mov

Hope it works out manilo

[manlio]

Great! This is perfect. Needs only fine adjustment and more speed.
Thanks Thanks Thanks

:applause:

[Anadin]

Ooh Ooh - I've got another idea!!

I'm assuming you're using R8 - you could use a spline deformer running along a spline - this would avoid the breakup of the edges.

run a spline along the artery like JoelD's example, make a circle perpendicular to the spline and then align to spline tag. (you also need a spline in the deformer the same size as the artery).

[JoelOtron]

Hey--that sounds like a great idea!

My mind is still wired to R7. Need to start using some of the newer features.

[manlio]

Thanks Anadin for this great tip!

[SeanL]

Hi Joel,

I would be interested to know how you modeled and textured the tube/artery (post #2 in this thread). It really gives the feeling of resistance by the structure to the bulge forming.

Thanks,

Sean

[JoelOtron]

The model is simply an extruded profile created in illustrator.

To animate the bulge I used the bulge deformer. You need to make sure you apply the stick texture tag when using deformers to insure that the textures deform with the model. Thats probably the effect you refer to.

The texture was SLA 3d noise using SEMA in the color channel and in the bump channel.

[SeanL]

Thanks for the details Joel.

This is a great forum. Hopefully I'll be able to put into it as I get
better.

That seems like a good exercise to see if I can duplicate what you
did there. What will you illustrate with your artery animation?

Sean

[Creature]

A pulsing artery (well, cylinder :D) done with a series of Bulge-Deformers. You can animate the Bulges along the spline which defines your artery to let it follow your custom shape.

61kb DivX5.0.3 Demo (http://www.heaven-is-3d.com/remote/arterie.avi)

[manlio]

Best regards to all contributors.
Now I have no time to test, but as soon as I will make some rendering I will post it

@SeanL
What will you illustrate with your artery animation?
If this question is for me, It is only a personal test animation for presenting what I can do

[SeanL]

Trying to determine why the bulge deformer works differently on different cylinders...sometimes it only affects the cylinder ends (increasing/decreasing the radius)

...and sometimes it deforms the cylinder like a blob moving through an intestine (when moving the deformer along the Y axis with a vertical cylinder).

This is driving me crazy as I have two setups and can't find any difference
between them except for the above result.

Any thoughts?

Sean

[JoelOtron]

Its dependent on the subdivision of the cylinder.

You have the height segments of the cylinder set to 0. You need to icrease the # of segments. The more there are the smoother the deformation.

[SeanL]

Ok...

Thanks Joel.

S

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