Composition with RealFlow and After Effects

Discussions about the use of Realflow in other Software Packages
incsys
Posts: 42
Joined: Sat Aug 17, 2013 7:00 am

Composition with RealFlow and After Effects

Postby incsys » Thu May 01, 2014 5:29 pm

hey there

Can someone explaine me, how I can composit the folow simulations?

1st movie: Scene with realflow mesh rendered
2nd movie: realflow particles rendered with krakatoa (white particles / black background)
3th movie: realflow splash and foam rendered (black background)

How can I put this 3 videos together so that this will look like one movie?
So the mesh, the krakatoa rendered particles, splash and foam together?

thank you


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ChristianZ
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Re: Composition with RealFlow and After Effects

Postby ChristianZ » Thu May 01, 2014 5:40 pm

Hi

a black background is ok, but there is something even more useful for compositing: an alpha-channel. That is giving you transparency when you render an object over a background which can be neglected. So in the render settings of C4D check the alpha-channel option before rendering and choose a format that allows layers (for example psd for use in after effects).
http://www.youtube.com/watch?v=Fvnds00eF4g
RF10 standard, System specs: OSX 10.11, MacPro 4.1 2xXeon, GTX980Ti, 64 GB RAM

incsys
Posts: 42
Joined: Sat Aug 17, 2013 7:00 am

Re: Composition with RealFlow and After Effects

Postby incsys » Sat May 03, 2014 3:04 pm

thank you for you reply. but what do you do when you have a
liquid with comes from outsine into an object? If I render this just with krakatoa, you see
the liquid as it is only outside and not goes into an object. But the liquid should be not so bright
inside the object like outside. there should be a difference.

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ChristianZ
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Re: Composition with RealFlow and After Effects

Postby ChristianZ » Sat May 03, 2014 3:31 pm

In this case I would not separate the liquid (rendered as liquid mesh) and glass object layers. The renderer takes care of the light interactions between the object and the liquid, for example light traveling through the transparent liquid and being refracted when entering and leaving a medium with different density. Before I was speaking about the background, to make it transparent if the entire object and liquid should be placed onto a photograph for example.

If another layer like krakatoa comes into play, it may be necessary to render out a pass for the object (use the object ID channel in C4D render layer management) and another one for material transparency, but I am also just learning that with krakatoa-for-C4D currently.
RF10 standard, System specs: OSX 10.11, MacPro 4.1 2xXeon, GTX980Ti, 64 GB RAM

incsys
Posts: 42
Joined: Sat Aug 17, 2013 7:00 am

Re: Composition with RealFlow and After Effects

Postby incsys » Sat May 03, 2014 3:37 pm

yes I agree with you.
Once I gonna render the liquid with environment as mesh.
But I also want to render to particles. Such as Foam and Splash (With krakatoa).
So how? For the foam and splash I need as you sad a seperate rendering with alpha-channel.

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ChristianZ
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Location: CH

Re: Composition with RealFlow and After Effects

Postby ChristianZ » Sat May 03, 2014 4:33 pm

Yeah, I have to learn that myself first :oops:

Probably makes sense to start with a simpler scene without glass object.
RF10 standard, System specs: OSX 10.11, MacPro 4.1 2xXeon, GTX980Ti, 64 GB RAM

incsys
Posts: 42
Joined: Sat Aug 17, 2013 7:00 am

Re: Composition with RealFlow and After Effects

Postby incsys » Sat May 03, 2014 8:12 pm

is it possible to composite the "particles" of foam and splash rendered with krakatoa
to load with alpha-channel into after effects and set an layermask over it with just
the object to darken this region with particles?


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