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I have problem with sommthi height fields - they have random black
spots/parts. Problem is connected with smooth (without it it works ok),
with light/shading (because using diffuse 0 ambient 1 helps).
Example:
#if (1)
height_field {
png "../media/bmp/hf/gory2.png"
smooth
translate <-.5, -40/256 ,-.5>
scale <70000,10000,70000>
texture { texLand1Far3 }
}
#end
#if (1)
height_field {
tga "../media/bmp/hf/gory3b.tga"
smooth
translate <-.5, -40/256 ,-.5>
scale <70000*5,1,70000*5>
texture { texLand1Far4 }
scale <1,80000,1>
}
#end
I think that such problem was disscused here before, wasn't the path
applyed to MegaPov 1.1 nor PovRay 3.6.1 (tested in both, on Win32)?
--
http://www.raf256.com/3d/
Rafal Maj 'Raf256', home page - http://www.raf256.com/me/
Computer Graphics
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This is a known problem. The "smooth" keyword, especially when resizing the
height_field, may result in unexpected shadow artifacts. One possibility is
to use double_illuminate and/or no_shadow, another is to use an isosurface
or just write a script to calculate the mesh yourself.
IIRC correctly, the problem is due to the calculated normal's and how they
are moved about and scaled when resizing the heightfield, but someone with
more expertise might know the actual, 'correct' bug. ;-)
Regards,
Tim
--
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>
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Tim Nikias wrote:
>
> IIRC correctly, the problem is due to the calculated normal's and how they
> are moved about and scaled when resizing the heightfield, but someone with
> more expertise might know the actual, 'correct' bug. ;-)
No, such a bug existed but has been fixed in 3.6 IIRC. AFAIK there are
no known bugs related to heightfields that are not fixed. Of course
smooth heightfields suffer from the same problems as smooth meshes.
Christoph
--
POV-Ray tutorials, include files, Sim-POV,
HCR-Edit and more: http://www.tu-bs.de/~y0013390/
Last updated 23 Sep. 2004 _____./\/^>_*_<^\/\.______
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Christoph Hormann <chr### [at] gmx de> wrote:
> Of course
> smooth heightfields suffer from the same problems as smooth meshes.
And as for those, see sections 2.4.8 and 2.4.9 of the documentation.
--
#macro N(D)#if(D>99)cylinder{M()#local D=div(D,104);M().5,2pigment{rgb M()}}
N(D)#end#end#macro M()<mod(D,13)-6mod(div(D,13)8)-3,10>#end blob{
N(11117333955)N(4254934330)N(3900569407)N(7382340)N(3358)N(970)}// - Warp -
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news:41bb1330@news.povray.org...
> Christoph Hormann <chr### [at] gmxde> wrote:
> > Of course
> > smooth heightfields suffer from the same problems as smooth meshes.
>
> And as for those, see sections 2.4.8 and 2.4.9 of the documentation.
>
don't you mean 9.9.1 to 9.9.3?
Marc
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Jacquier Marc <jac### [at] wanadoofr> wrote:
> don't you mean 9.9.1 to 9.9.3?
There are only three chapters in the current POV-Ray documentation.
--
plane{-x+y,-1pigment{bozo color_map{[0rgb x][1rgb x+y]}turbulence 1}}
sphere{0,2pigment{rgbt 1}interior{media{emission 1density{spherical
density_map{[0rgb 0][.5rgb<1,.5>][1rgb 1]}turbulence.9}}}scale
<1,1,3>hollow}text{ttf"timrom""Warp".1,0translate<-1,-.1,2>}// - Warp -
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news:41bb74a9@news.povray.org...
> Jacquier Marc <jac### [at] wanadoofr> wrote:
> > don't you mean 9.9.1 to 9.9.3?
>
> There are only three chapters in the current POV-Ray documentation.
>
> --
Sorry, I was talking about POV-Ray 3.5 doc :/
Marc
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