RE: hair emission on a displaced geometry

["Halfdan Ingvarsson" <hingvars(at)Softimage.COM>]

Er... Let's not bring up 3Delight again, shall we? Luc-Eric is already in the witness relocation program because of it, some people are in hiding and the authorities are having to identify most of the bodies from dental records alone.

 

It's possible but it would require moving the hair generation into a geoshader (or at least some post-processing part of it), so that we could call the emitter surface's displacement shader to know how much to move the hairs by.

 

 - ½

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From: owner-xsi(at)Softimage.COM on behalf of Nick
Sent: Fri 14-Apr-06 23:29
To: XSI(at)Softimage.COM
Subject: Re: hair emission on a displaced geometry

That could be dealt with in the hair shader couldn't it Halfie? Displace the hairs at render time too? That's how we deal with it with 3delight... maybe for the next release? :):):)

On 4/13/06, Greg Smith <greg(at)stanwinston.com> wrote:

Thats what I figured, just wanted a confirmation! thanks Raff!

Greg

----- Original Message -----
From: "Raffaele Fragapane" <jaco(at)thejaco.com>
To: <XSI(at)Softimage.COM>
Sent: Monday, April 10, 2006 8:04 PM
Subject: Re: hair emission on a displaced geometry


> the mihair primitives are placed in space according to the guides and
> the settings for that hair object.
> all of this happens before the displacement is calculated, hence yes,
> it's a known issue, not there isn't a straightforward solution for it yet.
>
> unless your displacement is animated though you might want to consider
> propagating at least the biggest mass changes into the geometry, and
> this holds true for a number of reasons (including lowering the
> displacement bounds and helping calculations).
>
>  ******************************
> |     Raffaele Fragapane       |
> |     Rising Sun Pictures      |
> | "Remember, TD is for TopDog" |
>  ******************************
>
>
>
> Greg Smith wrote:
>
> > I was curious if this is a known issue.  I have a polymesh geometry
> > that I use to as an emitter object for hair. I also have a
> > displacement map on that object which offsets the surface quite a bit.
> > I noticed that where the surface is concaved from the displacement,
> > the hair does not follow the displaced surface. I do have my
> > emitter-subd level set to be the same as the rendered geometry. So I
> > doubt it has anything to do with that. Can anyone verify if this is a
> > known issue?
> >
> > Greg Smith
> >
> >
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