[Bf-funboard] Re: Shadow casting particles

[malefico andauer]

 --- bf-funboard-request at projects.blender.org
escribió: 
> >>As we've known for ages, Particles don't cast
> shadows.
> >>
> >>This is ok for animated particles, but what about
> static ones? The
> >>workaround is rendering the frame from several
> different angles and using
> >>that for shadow maps. But the problems comes with
> animations.

You can actually use an environment map to fake
shadows
This is a nice trick that worked for faking translucid
shadows too.

You can have a grasp of it at:
http://www.seyanim.com/tutos/envmapshadow.htm
(in spanish, but looking at the picture is almost
slef-explanatory)

You can fake caustics with this technique too.

Regards.

malefico.

PS: Of course, the best would be not to use any
hack...

> >>
> >>The main reason that this happens is that static
> particles can only use
> >>Halos if they are to not appear as a fuzzy blob.
> So why not introduce
> >>another type of material that are like Halos, but
> cast shadows and don't
> >>glow.
> >>    
> >>
> >
> >The problem is that halos don't cast shadows (and
> considering what a halo is 
> >supposed to be, this is quite logical).  A partical
> system (both static and 
> >dynamic) with a dupliverted mesh or metaballs does
> cast shadows.
> >
> >I'm not quite sure what you are saying about the
> "fuzzy blob" part.  Is it 
> >that the mesh corners show or are you refering to
> metaballs being fuzzy?   
> >
> >If you are using shaded halos to do something like
> smoke, you can always 
> >duplicate your emitter, parent and duplivert a mesh
> to it, and set it to 
> >shadow only.
> >
> >  
> >
> Halos are meant to emulate spherical volumetric
> space, right?  So just 
> input to the raytrace the equation for a sphere to
> do your shadow 
> calculation.
> 
> joeedh
> 
> 
> ------------------------------
> 
> Message: 2
> Date: Mon, 20 Dec 2004 23:56:50 +1100
> From: Matt Ebb <matt at mke3.net>
> Subject: Re: [Bf-funboard] Shadow casting particles
> To: bf-funboard at projects.blender.org
> Message-ID:
> <9D7770A2-5286-11D9-8828-000D93289630 at mke3.net>
> Content-Type: text/plain; charset="us-ascii"
> 
> On 20 Dec 2004, at 11:49 PM, joeedh wrote:
> 
> > Halos are meant to emulate spherical volumetric
> space, right?  So just 
> > input to the raytrace the equation for a sphere to
> do your shadow 
> > calculation.
> 
> And get a hard circular shadow on a soft fuzzy halo?
> 
> How about an approach where Halos are treated
> internally as textures 
> mapped on planes with alpha - then you could render
> with TraShad... ?
> 
> Matt
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> ------------------------------
> 
> Message: 3
> Date: Mon, 20 Dec 2004 15:02:33 +0200
> From: Kassem Nasser <kassem.nasser at gmail.com>
> Subject: [Bf-funboard] Help on a new project with
> Blender
> To: bf-funboard at projects.blender.org
> Message-ID:
> <ab1eb3c1041220050277da7f15 at mail.gmail.com>
> Content-Type: text/plain; charset=US-ASCII
> 
> Hello everybody,
> I am sending this email as I am starting a new
> project using Blender.
> The project scene is under the water of an ocean, so
> I am in need of
> some .blend files of some modellings and textures of
> things under
> water (fish, shark,....), does anyone knows about a
> link where I can
> find something like that.(I googled but nothing to
> find.)
> Your help is greatefully appreciated.
> 
> Best Regard,
> -- 
> --Kassem Nasser--                                 
> Kassem Nasser
> --kmn01 at aub.edu.lb--                            
> American University of Beirut
> --kmn02 at hotmail.com--                         
> P.O.Box 11 -0236/5253
> --kassem.nasser at gmail.com--               Riad El
> Solh Beirut: 1107 2020
> WS:www.students.aub.edu.lb\~kmn01   Lebanon
> 
> 
> ------------------------------
> 
> Message: 4
> Date: Mon, 20 Dec 2004 14:09:23 +0100 (CET)
> From: alex <alex at schnittenparadies.de>
> Subject: Re: [Bf-funboard] Help on a new project
> with Blender
> To: Kassem Nasser <kassem.nasser at gmail.com>,
> 	bf-funboard at projects.blender.org
> Message-ID:
> <Pine.LNX.4.61.0412201408250.756 at time.intrr.org>
> Content-Type: TEXT/PLAIN; charset=US-ASCII;
> format=flowed
> 
> On Mon, 20 Dec 2004, Kassem Nasser wrote:
> 
> > Hello everybody,
> > I am sending this email as I am starting a new
> project using Blender.
> > The project scene is under the water of an ocean,
> so I am in need of
> > some .blend files of some modellings and textures
> of things under
> > water (fish, shark,....), does anyone knows about
> a link where I can
> > find something like that.(I googled but nothing to
> find.)
> 
=== message truncated === 


	

	
		
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