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I am attempting to animate entering a theater on a foggy or rainy night:

enter image description here

I used cycles rendering with a world volume setting of volume scatter to have the two spotlight cones appear as if they are shining through the haze. I like very much how the above still image appears.

However, when I animate the camera walking into the theater, the volume scatter appears static and locked to the viewpoint of the camera. It is especially noticeable when you are under the marquee, it looks like you are shooting film through a dirty pane of glass!

Entering a theater animation - draft01

I was expecting to have the sense of the camera walking through the fog particles.

What would be a better modeling approach to have fog that the camera walks through when animated?

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  • $\begingroup$ You could simply use different seeds for each frame. You can find that setting (if you don't know already) under Sampling next to Seed. This will generate different noise patterns for each frame making the volume scatter look like it is moving. This is a very quick solution, so I am sure there can be better ones, but anyway I would recommend using different seeds for each frame in all animations. Trust me, I have tested that many times, and the animations with the same seed used look very weird. $\endgroup$
    – Tooniis
    Commented Jun 2, 2017 at 19:49
  • $\begingroup$ I have no clue if it would work. But maybe try taking off the world volume and just make a cube covering your building and add a scatter/absorption shader in the volume slot with a texture to break it up. $\endgroup$
    – icYou520
    Commented Jun 2, 2017 at 20:08
  • $\begingroup$ And : blender.stackexchange.com/questions/925/… $\endgroup$
    – user1853
    Commented Jun 2, 2017 at 21:21
  • $\begingroup$ To make a moving texture with a domain (as suggested by @icYou520) read this link: blender.stackexchange.com/questions/57537/… $\endgroup$
    – user1853
    Commented Jun 2, 2017 at 21:29

1 Answer 1

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On the sampling section enable the icon that looks like a clock.

That will generate a different seed for every frame, making the noise pattern different.

enter image description here

Blatantly taken form the Blender Manual:

Seed

Seed value for integrator to get different noise patterns.

Animate Seed (clock icon)

This button which can be found on the right side of the Seed value can be used to give different seed values. It is a good idea to enable this when making animation because in the real world each frame has a different noise pattern.

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