Re: worldaxis RGB depthfade/distance shader?

["Tim Leydecker" <BauerOink(at)gmx.de>]

Hi Axel, Hi Holger,

both ways have something to fancy. Thanks guys!

I like the idea of the nulls/implicits quite a lot since I
try to have a way to visually set in/out ranges while
being able to move/parent those controls to something.

In this case a light w/solid (volume) coneobject.

The axis gradients are meant to be used to shade
that surface/volume with greater control, I could
start with something faking linear fallof but could
as well change this to exponential or set extra color
input positions according to desire.

This rensults in a very fast ADD layer for comping
volumeffects.

The second (easier) solution I hope to derive is for
cameraspace, I want to be able to fallow a light
attached to camera independently for screenspace XY.
Think of some sort of deepsea footage, it´s basically
a mult onto a Z-depth comped FG element.

The reason why I´d want this extra pass is to be able
to put viewer focus on the character/props appearing
disapearing, by animating luminance and DOF for
each element. Would be great to prevent colorbanding
and much fiddling by simply sliding some nulls while
having the renderregion update in (almost) realtime.
(I love satelite rendering...)

Here´s a cheesy sampleclip (pretty old, ignore the toonline):

http://www.hafenlola.com/downloads/fadeaway.mov

360KB, showing/simulating a cameraheadlight fading
by distance, toonline was meant to be used for thickness
driving SSS but is pretty much obsolete now.

Cheers


tim

P.S: I won´t be able to respond for the rest of today, sorry!





----- Original Message ----- 
From: "Schoenberger" <XSI(at)digidragon.de>
To: <XSI(at)Softimage.COM>
Sent: Tuesday, March 21, 2006 2:34 PM
Subject: RE: worldaxis RGB depthfade/distance shader?


> But this would be a Zbuffer/depth pass, not a XYZ coordinate pass...
>
> Holger Schönberger
> technical director
> The day has 24 hours, if that does not suffice, I will take the night
>
>
>  |> I have an even easier setup.
>  |> Get a Scalar_State (set it to Ray length) plug this into a
>  |> Change_range and plug this into the Surface of a material.
>  |>
>  |> Get two nulls (I call them NEAR and FAR) and put the
>  |> following expressions in the Change_range Old Range Start and End:
>  |>
>  |> ctr_dist_cam( NEAR.kine.global.pos )
>  |>
>  |> ctr_dist_cam( FAR.kine.global.pos )
>  |>
>  |> Set the New Range Start and End to 1 and 0.
>  |>
>  |>
>  |> Move the nulls to get a white to black gradient between them.
>
>
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