POV-Ray : Newsgroups : povray.binaries.images : A lovely column Server Time
28 Apr 2024 14:59:23 EDT (-0400)
  A lovely column (Message 1 to 3 of 3)  
From: Anthony D  Baye
Subject: A lovely column
Date: 1 Mar 2016 18:30:00
Message: <web.56d625c08c05fbb8fd6b6fe10@news.povray.org>
I finally got this to look the way I wanted it.  I had to build it as a point
cloud, save the data as a .ply, create the mesh in meshlab (which crashes at the
drop of a hat) and then tweak it in blender before converting it with
ply2mesh2...

I like the texture, but I'm not sure it fits with the application I have planned
for it.  I would like to use radiant lighting and sslt, but my experiments so
far seem to indicate that this is madness.

Has anyone else had success combining the two?

Regards,
A.D.B.


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From: Alain
Subject: Re: A lovely column
Date: 2 Mar 2016 16:39:05
Message: <56d75d79$1@news.povray.org>

> I finally got this to look the way I wanted it.  I had to build it as a point
> cloud, save the data as a .ply, create the mesh in meshlab (which crashes at the
> drop of a hat) and then tweak it in blender before converting it with
> ply2mesh2...
>
> I like the texture, but I'm not sure it fits with the application I have planned
> for it.  I would like to use radiant lighting and sslt, but my experiments so
> far seem to indicate that this is madness.
>
> Has anyone else had success combining the two?
>
> Regards,
> A.D.B.
>

When the translucency is low, you often don't need to do anything 
special when using radiosity and SSLT.
By default, subsurface ignore radiosity and radiosity ignore subsurface.
When you increase translucency, it become interesting to add:
subsurface{radiosity on}
Allow subsurface to take radiosity illumination into account.
and
radiosity{subsurface on}
Allow radiosity to take subsurface into account.

Both will slow down the rendering around objects using translucency.


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From: Anthony D  Baye
Subject: Re: A lovely column
Date: 2 Mar 2016 17:45:01
Message: <web.56d76c9bb4f046f7fd6b6fe10@news.povray.org>
Alain <kua### [at] videotronca> wrote:

> > I finally got this to look the way I wanted it.  I had to build it as a point
> > cloud, save the data as a .ply, create the mesh in meshlab (which crashes at the
> > drop of a hat) and then tweak it in blender before converting it with
> > ply2mesh2...
> >
> > I like the texture, but I'm not sure it fits with the application I have planned
> > for it.  I would like to use radiant lighting and sslt, but my experiments so
> > far seem to indicate that this is madness.
> >
> > Has anyone else had success combining the two?
> >
> > Regards,
> > A.D.B.
> >
>
> When the translucency is low, you often don't need to do anything
> special when using radiosity and SSLT.
> By default, subsurface ignore radiosity and radiosity ignore subsurface.
> When you increase translucency, it become interesting to add:
> subsurface{radiosity on}
> Allow subsurface to take radiosity illumination into account.
> and
> radiosity{subsurface on}
> Allow radiosity to take subsurface into account.
>
> Both will slow down the rendering around objects using translucency.

It doesn't make much sense to render SSLT without taking radiosity into account
if you're using bright objects as light sources, so that's what I've been doing.
So far, however, the object always comes out bright pink, no matter what the
translucency is set to.  Turning on subsurface in the radiosity block causes
everything to white out.

Still playing with it.

Regards,
A.D.B.


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