 | | | Fog Question | Fog Question 2005-05-17 - By David Shirk
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Hi Joey-
There's a bunch of ways to get a fog-type pass effect. My current fave is to
use a color override on objects. Example workflow:
1-Create a new Pass
2-Place all your visible objects into a partition.
3-Apply a Math>Linear_Falloff shader node to the partition. Adjust the start
and end falloff values to your taste. You can also use the
Exponent_Falloff if you want a more curving falloff.
4-(advanced option - also a little bit slower to render) Plug the Falloff node
into a Gradient_Mixer node's Input connection and set the input type
to scalar. Connect the Gradient mixer to the partition material "surface"
input. You can now interactively control the exact coloring/falloff/etc of
your 'fog'
This technique renders very fast, since there's no volume or shading
calculation to speak of. It gets a little bit more complex to set up if you're
dealing with objects that have transparency, but is still usable in that
situation.
Good luck
-Dave
Joey Lawrence wrote:
> Ok well I figured it out, I was doing a preview of all layers and not
> seeing a result, but when I actually rendered out a frame it rendered
> out the proper result. After seeing the result though, this will still
> not work b/c of lighting. I am using a Z-Depth Lens Shader for my
> camera and it is working ok, but I am still thinking that there is
> something better? I should also clarify that I am not exactly looking
> to make a fog effect, but a distance effect, IE: the further away
> something gets it starts to fade/get hazy. Is Z-Depth the way to do
> this? Thanks a lot!
>
> -Joey-
>
> On 5/15/05, Adam Sale <adamsale@(protected)> wrote:
>
>>for the render engine option have you tried setting the engine to render
>>using open GL?
>>-- -- Original Message -- --
>>From: "Joey Lawrence" <xsiforum@(protected)>
>>To: <XSI@(protected)>
>>Sent: Sunday, May 15, 2005 10:29 AM
>>Subject: Fog Question
>>
>>
>>>Here is another rather simple question, but something that I need to
>>>know. I am looking to put some fog into my scene and have a found that
>>>I can add a Z-Deph Shader to my camera and get a black to white fog
>>>result. I have also noticed that in the camera display properties
>>>there is a depth-cue/fog option where you can also control your fog
>>>and it is a lot more intuitive. I was reading that there is a way to
>>>render the depth-cue/fog effect if you go into your Render Options and
>>>then go to Render Engine and change your Render Engine to Current
>>>camera display settings... this is what it says that it does...
>>>
>>> "outputs to file the OpenGL rendered scene. Scene elements are
>>>rendered according to the current camera display settings as defined
>>>in the Camera Display property editor.
>>>This is useful for rendering particular camera display effects like
>>>depth-cue fog."
>>>
>>>So I have tried every option that I know to try and still no luck on
>>>getting the Depth-Cue to render out. I guess that my real question is
>>>what is the BEST way to add fog to a scene. Thanks in advance!
>>>
>>>-Joey-
>>>
>>>---
--
| David Shirk | technical animator | industrial light + magic |
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