Re: worldaxis RGB depthfade/distance shader?

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

Hi Holger,

thanks for the explanation, I also looked into using a
Cameraprojection, will now look at how to set ranges.

Will also have a look at  http://www.andynicholas.com/
as soon as it is available again...maybe I reinvent the wheel.

> A new object requires a new projection.
> The projections are inside the object, not the shader.
> You need to create a spatial projection for each object.

I´ll log a feature request at Softimage, Maya allows to share
a projection (in a shading network) across multiple objects.

Should prove to be a timesaver and also makes all sorts of
texturing/rendermapping/re-projecting across multiple objects
alot easier - since it boils down to one node you SRT for all.

Thanks again for the  tips,

Cheers


tim


----- Original Message ----- 
From: "Schoenberger" <XSI(at)digidragon.de>
To: <XSI(at)Softimage.COM>
Sent: Monday, March 20, 2006 11:08 AM
Subject: RE: worldaxis RGB depthfade/distance shader?


> A new object requires a new projection.
> The projections are inside the object, not the shader.
> You need to create a spatial projection for each object.
>
> Or you use a different way. With the vector state node, set to 
> "intersection point" you get the world coordiates without any
> projection.
> But then you have to do some vector math in the render tree to scale it to 
> the range you want.
>
>
> Holger Schönberger
> technical director
> The day has 24 hours, if that does not suffice, I will take the night
>
>
>
>  |> -----Original Message-----
>  |> From: owner-xsi(at)Softimage.COM
>  |> [mailto:owner-xsi(at)Softimage.COM] On Behalf Of Tim Leydecker
>  |> Sent: Sunday, March 19, 2006 1:10 AM
>  |> To: XSI(at)Softimage.COM
>  |> Subject: Re: worldaxis RGB depthfade/distance shader?
>  |>
>  |> O.k.,
>  |>
>  |> I got the shader working using three Texturespace Generators
>  |> but fail when I try to assign it to other objects, do I really need
>  |> to (re)link to the correct TextureSupports for every object or
>  |> do I miss something obvious?
>  |>
>  |> I would have thought the Texturesupports transfer automatically
>  |> with a shader (if it´s a projection at least).
>  |>
>  |> Any help appreciated, I´m stuck quite a frustrated. Scene, 200kB:
>  |> (mind wordwrap, may require XSI 5.01 adv but shouldn´t)
>  |>
>  |> http://www.hafenlola.com/downloads/somewhatbuggyperaxisdept
>  |> hchannel.scn
>  |>
>  |> Image showing result (as desired but what I can´t transfer
>  |> to other
>  |> objects):xyzaxis_gradient.jpg
>  |>
>  |> http://www.hafenlola.com/downloads/xyzaxis_gradient.jpg
>  |> (mind underscore, 58kB)
>  |>
>  |> What I´m trying to achieve, in a nutshell, have three
>  |> projections, scale
>  |> their
>  |> support to my liking and have them align to the worldaxis
>  |> or parented to a
>  |> light to have a way of finetuning volumetric effects,
>  |> falloff and intensity
>  |> by
>  |> the gradients *projected* into the three dimensions. For example.
>  |>
>  |> Cheers
>  |>
>  |> tim
>  |>
>  |>
>  |>
>  |>
>  |>
>  |> ----- Original Message ----- 
>  |> From: "Tim Leydecker" <BauerOink(at)gmx.de>
>  |> To: <XSI(at)Softimage.COM>
>  |> Sent: Wednesday, March 15, 2006 12:07 PM
>  |> Subject: Re: worldaxis RGB depthfade/distance shader?
>  |>
>  |>
>  |> > Thanks Holger,
>  |> >
>  |> > that´ll help a great deal.
>  |> >
>  |> > Cheers
>  |> >
>  |> > tim
>  |> > ----- Original Message ----- 
>  |> > From: "Schoenberger" <XSI(at)digidragon.de>
>  |> > To: <XSI(at)Softimage.COM>
>  |> > Sent: Wednesday, March 15, 2006 3:40 AM
>  |> > Subject: RE: worldaxis RGB depthfade/distance shader?
>  |> >
>  |> >
>  |> >>
>  |> >> Inside your render tree:
>  |> >> Get a Texture Space Generator/Projection.
>  |> >> Create a spatial projection, edit it and set it to
>  |> implicit/world.
>  |> >> Then use the UVW transformation inside the Projection
>  |> or perhaps you can
>  |> >> scale-rotate your spatial projection in your scene.
>  |> >>
>  |> >>
>  |> >> Holger Schönberger
>  |> >> technical director
>  |> >> The day has 24 hours, if that does not suffice, I will
>  |> take the night
>  |> >>
>  |> >>
>  |> >>
>  |> >>  |> -----Original Message-----
>  |> >>  |> From: owner-xsi(at)Softimage.COM
>  |> >>  |> [mailto:owner-xsi(at)Softimage.COM] On Behalf Of Tim Leydecker
>  |> >>  |> Sent: Tuesday, March 14, 2006 11:45 PM
>  |> >>  |> To: XSI(at)Softimage.COM
>  |> >>  |> Subject: Re: worldaxis RGB depthfade/distance shader?
>  |> >>  |>
>  |> >>  |> *bump*
>  |> >>  |>
>  |> >>  |> Maybe I got a bit carried away in my last e-mail. Came up
>  |> >>  |> with the trick myself. In my head, everything
>  |> looked so clear.
>  |> >>  |>
>  |> >>  |> I´m looking for a fast way to map individual gradients
>  |> >>  |> to the RGB colorchannels, each aligned to one worldaxis.
>  |> >>  |>
>  |> >>  |> In Maya (hate to say that), I´d simply create a 3D
>  |> projection
>  |> >>  |> node and scale it to the dimensions I need, align
>  |> it to one of
>  |> >>  |> the worldaxes (or whatever else) and use it as UV input for
>  |> >>  |> a gradient piped into one of the RGB channel of a
>  |> surfaceshader.
>  |> >>  |> Asign the shader to all sceneobjects and you´re done.
>  |> >>  |>
>  |> >>  |> *very fast. very easy to edit*
>  |> >>  |>
>  |> >>  |> Now I try to do the same thing in XSI but run into my own
>  |> >>  |> limitations in regard to material editing and
>  |> backroundknowledge.
>  |> >>  |>
>  |> >>  |> I´d really appreciate your help.
>  |> >>  |>
>  |> >>  |> Would make fading/bluring refelections, falloffs on
>  |> lights and
>  |> >>  |> rimlights on certain objects (in conjunction with a
>  |> normalpass)
>  |> >>  |> a snap or would at least help in getting that extra
>  |> bit of control.
>  |> >>  |>
>  |> >>  |> Cheers
>  |> >>  |>
>  |> >>  |> tim
>  |> >>  |>
>  |> >>  |>
>  |> >>  |>
>  |> >>  |>
>  |> >>  |>
>  |> >>  |> ----- Original Message ----- 
>  |> >>  |> From: "Tim Leydecker" <BauerOink(at)gmx.de>
>  |> >>  |> To: <XSI(at)Softimage.COM>
>  |> >>  |> Sent: Monday, March 13, 2006 11:21 PM
>  |> >>  |> Subject: worldaxis RGB depthfade/distance shader?
>  |> >>  |>
>  |> >>  |>
>  |> >>  |> > Hi folks,
>  |> >>  |> >
>  |> >>  |> > I´d like to use a worldspace/cameraspace Normalpass
>  |> >>  |> > together with depthfades, using one channel of a RGB
>  |> >>  |> > image for a seperate axis, e.g. X>R, Y>G and Z>B.
>  |> >>  |> >
>  |> >>  |> > Ultimatively, driving each (color)depth range by two
>  |> >>  |> > locators to make best use of the bitdepth, prevent
>  |> >>  |> > clipping or restrict the effect to a specific light.
>  |> >>  |> >
>  |> >>  |> > For faking (volume) light falloff and for
>  |> fintuned intesities?
>  |> >>  |> >
>  |> >>  |> > Is there anything in XSI prebuild that does this?
>  |> >>  |> >
>  |> >>  |> > Cheers
>  |> >>  |> >
>  |> >>  |> > tim
>  |> >>  |> >
>  |> >>  |> > P.S: I could also use a shader/pass that spitts out
>  |> >>  |> > seperate constant colors based on object/group/flag?
>  |> >>  |> > Automatically but reliable per sequence, e.g.not random...
>  |> >>  |> >
>  |> >>  |> >
>  |> >>  |> > ---
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