VolumeRays: how to do when my matte is offscreen?

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  01 January 2013
VolumeRays: how to do when my matte is offscreen?


I have a basic question, I use volumerays for a light, I have a matte ID of my light that I connect to the volumerays with a shuffle, everything works well. But my camera is moving and at some point the light (and the matte ID) goes offscreen. Then my volumerays are gone.
Do you have a solution? I'm sure it's not that hard but I can't find a way to do it.
My matte is in the EXR of my main output.

Thank you very much for reading and maybe for your help.
  01 January 2013
Should I forget my matte (alpha) and animate a rotomask?
  01 January 2013
you can render your matte id with overscan, so the information in it is still preserved even if it goes offscreen.

  01 January 2013
Thank you! I'm on 3ds Max, i think i've seen a script like that but it means i have to rerender the frames again and on max you cannot render a matte only, you have to render the whole thing. Of course I could do a material overide to avoid rendering with textures.
Can you tell me a little more about the processus in nuke when I rendered with overscan?

Thank you so much!
  01 January 2013
Depending on the shot, it may be faster to just add a framehold on the frame right before the MatteID goes offscreen, and just animate a transform node to continue it's motion. Depending on what the motion is, it may not be noticeable and would be faster than a re-render.
  01 January 2013
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