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  • Volumetric Noise from a video?

     Joseph M. Morgan updated 14 years ago 3 Members · 8 Posts
  • Joseph M. Morgan

    January 28, 2009 at 10:19 pm

    Is there a way to change the noise to my own image for volumetric lighting noise for a spot light?

    I was hoping I could make the visible noise react to a video… such as what you would see in the volumetric noise of a film projector while the film is running.

    Or… if you can imagine using Trapcode shine in After Effects, and seeng just the rays, and not the source of them.


  • Brian Jones

    January 29, 2009 at 3:39 pm

    Noise settings in the light (pretty much all the settings) can be animated/controlled in xpresso, can’t test but likely the sound node in xpresso or the Sound effector (MoGraph) could be used to drive Noise etc. settings in the light. Don’t know what that would do, can’t test till later today.

  • Adam Trachtenberg

    January 30, 2009 at 5:18 am

    You can use video footage. Place the footage in a material’s transparency channel and then place the material on the light. You’ll have to play around with the material’s projection to get it right.

  • Brian Jones

    January 30, 2009 at 5:44 pm

    Ahh, that was the meaning, I was reading too quickly obviously 🙂

  • Joseph M. Morgan

    January 31, 2009 at 3:26 pm

    Hmmmm… I’ve tried every combination of projection settings with no results… Is there anything I need to do with the light itself, other than dropping on the texture?

    Because of yours and Brian’s answers, it seems my approach must be too naive to succeed. This is what I’ve done.

    I have a spot light with “Visibile Light” turned on. For now, I’m just using a single frame of the video clip as my texture. That bitmap is sitting in the transparency channel of a texture, which is on my spotlight. The light “beam” doesn’t change at all, unless I turn on Noise. But then, it isn’t the noise from the material, it is the noise from the noise settings… which makes it look more like a fog or diffused smoke rather than the streaks one would expect from light beaming through a film strip.

    Am I missing something, or just not explaining myself well. Because I’m beginning to think I might need to create a cone around the visible light (or instead of the visible light), and put the texture on the cone stretched really far horizontally to simulate the streaks I need.


  • Brian Jones

    January 31, 2009 at 4:54 pm

    Sorry, ignore my earlier answer, I was obviously brain-dead when I read your post. Adam’s answer is right, you just need to put your movie/image into the Transparency channel of a material, then place the material on a light. An example

  • Adam Trachtenberg

    January 31, 2009 at 4:56 pm

    You have to use volumetric rather than visible light.

  • Joseph M. Morgan

    January 31, 2009 at 7:06 pm

    Thanks Brian and Adam… got it… it took a while to “undo” all my previous, but failing, attemtps to get it to work. for some reason, the image I am using required me to use inverse volumetric… but who cares…


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