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Tool To Provide Numeric Values Of Changing Luminence Of An Image Sequence


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#1 Alkesh

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Posted 01 September 2013 - 02:01 PM

Hello! I am trying to use an image sq. where an explosion is taking place, to provide me changing values of color and/or luminance, which I want to use to drive color/intensity of a point light in a 3D comp to light an object (FBX) that is going to be near that explosion site. I think Nuke has a tool called "Curve Tool" which can show changing values in an image sequence. How can I do this in Fusion? Thanks!! Alkesh.

#2 Alkesh

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Posted 01 September 2013 - 02:44 PM

Update... I may have found a way. I am working with "probe" modifier. Seems promising! I will post update if I am successful! Alkesh.

#3 SecondMan

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Posted 03 September 2013 - 12:52 PM

Probe is indeed your friend :)

You will also enjoy not having to prerender it, as Fusion can probe images on the fly.

#4 Tilt

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Posted 03 September 2013 - 02:09 PM

Just don't switch to the spline editor or Fusion will hang a bit while it probes your image sequence :)

(a multithreaded spline editor would be nice or a prerender/cache switch for the probe ala trails or the tracker)

#5 ChadCapeland

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Posted 03 September 2013 - 02:46 PM

We don't need to pre-render, we just need Number datatypes to be cached.

#6 Tilt

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Posted 03 September 2013 - 03:14 PM

indeed.

#7 Alkesh

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Posted 04 October 2013 - 02:03 PM

Hello.. and thanks! So I finished the relighting intro video tutorial where I needed the above help. If anyone interested, it's here. Also, I am posting videos on relighting a scene in Fusion. Two are already posted.

Relighting intro tutorial:


#8 Alkesh

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Posted 04 October 2013 - 02:03 PM

Relighting a scene discussion - parts 1 & 2:




#9 Tilt

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Posted 04 October 2013 - 04:07 PM

Hey Alkesh! Thanks for making these vids. You explain your techniques very well.

#10 Alkesh

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Posted 04 October 2013 - 04:26 PM

Thanks.. Tilt! Appreciate your kind words! You have no idea how much self-learning I go through to bring these videos, as I am not in the vfx industry. But I enjoy that learning process as well! Most of these I learn from you guys!

#11 Eagle1

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Posted 08 October 2013 - 02:05 PM

Also from me thanks to this very awesome Videos - its the only advanced video stuff we have for Fusion :mf_fartnew:

Is the Geometry Projection the only way for Re-Lighting? I have a Forest Scene for Night for Day Shot, it will difficult for this...

#12 MuRC

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Posted 08 October 2013 - 05:33 PM

its the only advanced video stuff we have for Fusion :mf_fartnew:


190 hq videos and counting

:mf_w00t2:

Thx for contributing Alkesh!

#13 Alkesh

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Posted 08 October 2013 - 09:05 PM

Thanks MuRC and Eagle1.

Also from me thanks to this very awesome Videos - its the only advanced video stuff we have for Fusion :mf_fartnew:

Is the Geometry Projection the only way for Re-Lighting? I have a Forest Scene for Night for Day Shot, it will difficult for this...


I assume that you need some geometry to effectively re-light the scene. I have seen work done where normal passes rendered from 3D packages such as Maya, which can be use to do some simple relighting. You can also use WPP to relight the scene... but I believe you need geometry. I hope others with more deep experience will add their comments. I always work out a way to use projection techniques for re-lighting.

#14 ChadCapeland

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Posted 08 October 2013 - 11:47 PM

If you don't have geometry, you will need a representative normal and depth map, and those USUALLY come from geometry (though they don't HAVE to). You can then just use those on a pair of triangles, ala Combustion. But while it is a very powerful technique if you want per-pixel control, it isn't so great at making viewport interaction or combining with other meshes.

#15 Tilt

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Posted 10 October 2013 - 12:57 AM

Alkesh, how did you configure your viewer to have a black background?




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