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Is there a way to configure povray to do goraud shading?
smooth_triangle for mesh{} and setting normals for mesh2{} seem
to do phong shading. For this particular picture, I'd rather
interpolate colors. Is there an easy way to do this?
Thank you for any/all comments on this matter.
--
cer### [at] cs drexeledu http://www.cs.drexel.edu/~cera
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Chris Cera wrote:
> Is there a way to configure povray to do goraud shading?
>
> smooth_triangle for mesh{} and setting normals for mesh2{} seem
> to do phong shading. For this particular picture, I'd rather
> interpolate colors. Is there an easy way to do this?
goraud shading is a technique specific to scanline renderers and since
POV-Ray is a raytracer...
You might be able to get the result you are after with per vertex
texturing: http://www.povray.org/documentation/view/192/
Christoph
--
POV-Ray tutorials, include files, Sim-POV,
HCR-Edit and more: http://www.tu-bs.de/~y0013390/
Last updated 11 Jan. 2004 _____./\/^>_*_<^\/\.______
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Chris Cera <cer### [at] csdrexeledu> wrote:
> Is there a way to configure povray to do goraud shading?
No.
There usually aren't any good reasons to perform gouraud shading.
In scanline renderers it's supported because in scanline rendering
gouraud shading is considerably faster than phong shading. However,
the result is usually not very realistic.
In theory POV-Ray could support gouraud, but it would probably cause
more problems than it's worth (eg. how do you calculate the direction
of the reflected ray if the mesh is reflective?).
You can define different colors for the vertices of a mesh and POV-Ray
will interpolate these colors, but there's no way of making POV-Ray to
calculate these colors automatically from the light sources.
--
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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Christoph Hormann <chr### [at] gmxde> wrote:
> goraud shading is a technique specific to scanline renderers and since
> POV-Ray is a raytracer...
Actually POV-Ray could do gouraud shading, but the benefits would be
dubious.
--
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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