 | | | Fog Question | Fog Question 2005-05-17 - By Sam Cuttriss
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if its plugged into the volume it will return the length of the objects
interior, otherwise it works fine.
_sam
kim aldis wrote:
>Another one would be to use the scalar state ray length node. I'm not sure
>how well this behaves with reflections and refractions but for depth passes
>it's pretty quick.
>
>
>
>>-- --Original Message-- --
>>From: owner-xsi@(protected)
>>[mailto:owner-xsi@(protected)] On Behalf Of David Shirk
>>Sent: 17 May 2005 17:57
>>To: XSI@(protected)
>>Subject: Re: Fog Question
>>
>>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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