Animating Light Fog? - "Dusty Light" PLEASE HELP!

[Fatal_Films]

Hi guys,
i desperately need your help... ANY help!
I have a spotlight outside a building, shining through an opening towards the inside. This spotlight has light fog.
now, what i really need is for the light fog to look more realistic by making it look like "dust particles"

i thought its a simple image sequence of GRAIN loaded into the color attribute of the spotlight.

I was wrong.
I have loaded an image sequence into the spotlight aswell as the fog's color attributes, and in both cases the lights "texture sample" turns black and nothing is seen...

please guys... i would really appreciate any input, in order to make a realistic dusty moving light fog...

Thanx in advance
-Martin

[Fatal_Films]

I get it to work as i would like... without the "Use Image Sequence" toggle sellected.
So yes, works on a still frame, but turns BLACK as soon as i toggle the :Use image sequence" sellection on.

PLEEEEASE HELP!
Kind Regards

[zhenka22]

You can get a descent effect by linking a 3D fractal node to your light fog density attribute. You wont get specific dust particles visible but by animating the fractal over time, you can achieve the look of slowly drifting dust.

If you really need a grainy look, just use your image sequence of grain in post with a blending mode over your render (easily done in after effects).

[Fatal_Films]

Hi Zhenka,
thanx allot! i really appreciate your help.
I have some concerns though...
I know this is very amateur of me...
Will you be able to just give me a few steps to achieve the 3D Fractal on my Light Fog...
I hav etried everything... still cant get it to work....

please any "how to's" will be much appreciated.
Kind Regards

[Fatal_Films]

I think i got it right... well it looks like it on a still frame render...
I assume they (the fractals) will move if a sequence is rendered out?

[zhenka22]

You have to go into the fractal's attributes, and from memory you have to check the 'animated' box. What you do then is go to frame 1 on the timeline, right click on the 'time' value and keyframe it. Then go to the last frame of your animation, increase the value of time from 0 to any number you want, and then keyframe that. Scrub through your timeline to make sure that the 'time' value is keyframed properly.

You will have to do a few test renders to work out what your maximum value for 'time' should be to achieve a realistic speed for the dust cloud.

That should do the trick...

[Fatal_Films]

Thanx mate. I m giving it a try...
Regards