In fact the origin data is a mesh which is composed by lots of
rectangle.because the render's effect is not so good,I export the data by
veterxs and the triangles.and want to use the povray to render it.the code
is below,the problem is that it looks not smooth and I can see the diagonal
at rectangle.when the mesh become more fine,the mesh looks more nosie
dot.Do i need more information from origin data?or is there some good way
to do this.I don't use povray before.thanks a lot.

by the way ,the origin data is produced by a  arithmetic which produce   s
some sharp features on a  surface.so it is important that the sharp
features(the cicrle at center)looks more reality.

#version 3.5;

global_settings { assumed_gamma 2.2 }
 #include "colors.inc"

camera {
  location <57.389993, -47.027113, -126.558366>
  look_at <24.334664, 20.225615, 7.853619>
}

light_source { <24.334664, 24.637599, -38.176342> color rgb<1, 1, 1> }

light_source {
  <24.334664, 24.225615, -38.116731>
  color rgb<0, 0, 255>
  spotlight
  radius 150
  falloff 10
  tightness 10
  point_at <24.334664, 20.225615, 20.853619>
}

background { color rgb<255,255,255> }

// Layer: Object
//
mesh2 {
  vertex_vectors {
   625
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 < 3.06, 5.97, 6.72>
 < 2.28, 5.34, 6.53>
 < 2.95, 4.69, 6.49>
 < 3.70, 5.35, 6.66>
 < 1.45, 4.64, 6.32>
 < 1.62, 5.92, 6.56>
 < 2.14, 3.96, 6.30>
 < 3.61, 3.98, 6.44>
 < 4.34, 4.69, 6.61>
 < 5.03, 5.34, 6.75>
 < 4.41, 5.97, 6.82>
 < 4.26, 3.22, 6.39>
 < 4.97, 3.95, 6.54>
 < 6.21, 3.87, 6.58>
 < 5.64, 4.63, 6.67>
 < 5.55, 3.16, 6.45>
 < 5.67, 5.91, 6.87>
 < 6.26, 5.24, 6.79>
 < 4.76, 0.74, 6.12>
 < 4.15, 1.61, 6.18>
 < 5.98, 0.68, 6.15>
 < 5.45, 1.56, 6.24>
 < 4.87, 2.41, 6.32>
 < 6.11, 2.34, 6.36>
 < 8.12, 0.53, 6.12>
 < 7.71, 1.40, 6.25>
 < 7.08, 0.61, 6.14>
 < 7.88, 2.96, 6.48>
 < 7.25, 2.25, 6.37>
 < 8.35, 2.14, 6.36>
 < 6.62, 1.49, 6.26>
 < 6.75, 3.07, 6.48>
 < 7.96, 5.61, 6.85>
 < 7.43, 5.10, 6.78>
 < 7.98, 4.37, 6.69>
 < 8.54, 4.92, 6.76>
 < 6.84, 4.52, 6.69>
 < 6.85, 5.78, 6.88>
 < 7.38, 3.76, 6.59>
 < 8.50, 3.61, 6.58>
 < -2.4, 8.87, 6.87>
 < -3.1, 8.41, 6.62>
 < -2.4, 8.17, 6.62>
 < -1.7, 8.64, 6.87>
 < -4.4, 8.17, 6.37>
 < -3.8, 7.96, 6.37>
 < -3.7, 8.61, 6.62>
 < -4.0, 7.25, 6.12>
 < -3.2, 7.71, 6.37>
 < -4.6, 7.52, 6.12>
 < -1.8, 7.90, 6.62>
 < -2.5, 7.41, 6.37>
 < -6.6, 7.64, 5.87>
 < -6.3, 7.53, 5.87>
 < -5.6, 7.91, 6.12>
 < -5.9, 8.01, 6.12>
 < -6.7, 6.97, 5.62>
 < -5.9, 7.35, 5.87>
 < -7.2, 7.17, 5.62>
 < -5.1, 7.75, 6.12>
 < -5.4, 7.10, 5.87>
 < -4.9, 8.33, 6.37>
 < -6.4, 5.86, 5.37>
 < -7.0, 6.26, 5.37>
 < -7.8, 5.81, 5.12>
 < -5.0, 5.92, 5.62>
 < -5.6, 6.34, 5.62>
 < -6.2, 6.69, 5.62>
 < -4.8, 6.79, 5.87>
 < -7.5, 6.58, 5.37>
 < -2.0, 6.10, 6.12>
 < -2.7, 6.54, 6.12>
 < -3.5, 6.00, 5.87>
 < -3.3, 6.92, 6.12>
 < -1.9, 7.07, 6.37>
 < -4.2, 6.43, 5.87>
 < -0.9, 8.39, 6.87>
 < -0.1, 8.87, 7.12>
 < -0.9, 9.12, 7.12>
 < -1.0, 7.60, 6.62>
 < -0.2, 8.11, 6.87>
 < 1.25, 8.30, 7.09>
 < 0.55, 8.61, 7.11>
 < 0.43, 7.79, 6.86>
 < 0.66, 9.35, 7.35>
 < 1.38, 9.08, 7.33>
 < -0.5, 6.27, 6.37>
 < -1.2, 6.69, 6.37>
 < 0.96, 6.43, 6.59>
 < 0.29, 6.88, 6.61>
 < -0.3, 7.26, 6.62>
 < 1.12, 7.44, 6.84>
 < 3.81, 6.56, 6.89>
 < 3.20, 7.10, 6.96>
 < 2.43, 6.54, 6.77>
 < 3.33, 8.05, 7.19>
 < 2.58, 7.57, 7.02>
 < 3.92, 7.60, 7.12>
 < 1.79, 7.02, 6.81>
 < 1.93, 7.96, 7.06>
 < 3.57, 9.65, 7.65>
 < 2.85, 9.23, 7.49>
 < 3.46, 8.89, 7.43>
 < 4.13, 9.29, 7.56>
 < 2.07, 8.78, 7.30>
 < 2.19, 9.54, 7.54>
 < 2.72, 8.45, 7.26>
 < 4.03, 8.50, 7.35>
 < 4.65, 8.89, 7.46>
 < 5.16, 9.23, 7.52>
 < 4.70, 9.65, 7.65>
 < 4.58, 8.05, 7.25>
 < 5.15, 8.45, 7.35>
 < 6.10, 8.28, 7.27>
 < 5.62, 8.77, 7.40>
 < 5.66, 7.95, 7.24>
 < 5.55, 9.53, 7.55>
 < 5.97, 9.05, 7.41>
 < 5.09, 6.54, 6.96>
 < 4.50, 7.10, 7.05>
 < 6.26, 6.42, 6.97>
 < 5.69, 7.02, 7.07>
 < 5.13, 7.56, 7.16>
 < 6.20, 7.43, 7.13>
 < 8.42, 6.04, 6.89>
 < 7.79, 6.65, 6.97>
 < 7.36, 6.26, 6.94>
 < 7.51, 7.53, 7.06>
 < 7.19, 7.23, 7.06>
 < 8.13, 6.99, 6.96>
 < 6.77, 6.86, 7.03>
 < 6.62, 7.76, 7.16>
 < 6.75, 8.90, 7.23>
 < 6.64, 8.77, 7.26>
 < 7.15, 8.26, 7.14>
 < 7.25, 8.40, 7.10>
 < 6.43, 8.56, 7.28>
 < 6.21, 9.28, 7.39>
 < 6.94, 8.05, 7.16>
 < 7.72, 7.77, 7.03>

   }



  face_indices {
   1152
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  }



  texture {
    pigment { color rgb<1.0, 1.0, 1.0> }
    finish { ambient rgb<0, 0, 0> diffuse 0.5 }
  }
      scale 5
      rotate <0,0,0>
}

Post a reply to this message

For smooth surface, yo must calculate normal vector. Your code is flat.

For example :

mesh2 {
vertex_vectors{
8,
<-1.224802,2.750054,3.593432>,
<1.763963E-02,2.570504,2.81744>,
<1.763963E-02,0,2.81744>,
<-1.224802,0,3.593432>,
<1.763963E-02,2.570504,2.81744>,
<2.114852,3.271527,3.580328>,
<2.114852,0,3.580328>,
<1.763963E-02,0,2.81744>,
}
normal_vectors{
8,
<-2.134022,0,-3.416781>,
<-1.994692,0,-3.193701>,
<-1.994692,0,-3.193701>,
<-2.134022,0,-3.416781>,
<1.961009,0,-5.390894>,
<2.495811,0,-6.861088>,
<2.495811,0,-6.861088>,
<1.961009,0,-5.390894>,
}
uv_vectors{
3,
     <0,1>, <1,1>, <1,0>
}
 texture_list{
1,
texture {mat_white},
}
face_indices{
4,
<3,1,0>,0,
<3,1,2>,0,
<2,5,1>,0,
<2,5,6>,0,
    }
uv_indices{
4,
<0,1,2>,
<0,1,2>,
<0,1,2>,
<0,1,2>,
    }
normal_indices{
4,
<3,1,0>,
<3,1,2>,
<2,5,1>,
<2,5,6>,
    }
    }




Hasan...

Post a reply to this message

thanks,Hasan3,
I just saw the information about normal vector.it says that the
normal_vectors{}  is the vertex's normal and If the number of normals
equals the number of vertices then the normal_indices{} list is optional
and the indexes from the face_indices{} list are used instead.
   I don't understand the normal_indices{} is record for what?HOw it relate
to normal_vectors{}?it seems   like face_indices{} in the example.
   if I can get the face's normal,can use it?how?thanks.


"Hasan3" <PRO### [at] Yahoocom> wrote:
> For smooth surface, yo must calculate normal vector. Your code is flat.
>
> For example :
>
> mesh2 {
> vertex_vectors{
> 8,
> <-1.224802,2.750054,3.593432>,
> <1.763963E-02,2.570504,2.81744>,
> <1.763963E-02,0,2.81744>,
> <-1.224802,0,3.593432>,
> <1.763963E-02,2.570504,2.81744>,
> <2.114852,3.271527,3.580328>,
> <2.114852,0,3.580328>,
> <1.763963E-02,0,2.81744>,
> }
> normal_vectors{
> 8,
> <-2.134022,0,-3.416781>,
> <-1.994692,0,-3.193701>,
> <-1.994692,0,-3.193701>,
> <-2.134022,0,-3.416781>,
> <1.961009,0,-5.390894>,
> <2.495811,0,-6.861088>,
> <2.495811,0,-6.861088>,
> <1.961009,0,-5.390894>,
> }
> uv_vectors{
> 3,
>      <0,1>, <1,1>, <1,0>
> }
>  texture_list{
> 1,
> texture {mat_white},
> }
> face_indices{
> 4,
> <3,1,0>,0,
> <3,1,2>,0,
> <2,5,1>,0,
> <2,5,6>,0,
>     }
> uv_indices{
> 4,
> <0,1,2>,
> <0,1,2>,
> <0,1,2>,
> <0,1,2>,
>     }
> normal_indices{
> 4,
> <3,1,0>,
> <3,1,2>,
> <2,5,1>,
> <2,5,6>,
>     }
>     }
>
>
>
>
> Hasan...

Post a reply to this message

If you have the same amount of vertices as you have normals, the mesh will
use the first vertex with the first normal, the second vertex with the
second normal and so on.

But, if you have tons of the same normal (e.g. in a very planar mesh, you
might have lots of <0,1,0> normals), you can use normal_indices. For every
triangle defined with face_indices, you'd need to index which normals you
want to use.

Regards,
Tim

-- 
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>

Post a reply to this message

"Tim Nikias" <JUSTTHELOWERCASE:timISNOTnikias(at)gmx.netWARE> wrote:
> If you have the same amount of vertices as you have normals, the mesh will
> use the first vertex with the first normal, the second vertex with the
> second normal and so on.
>
> But, if you have tons of the same normal (e.g. in a very planar mesh, you
> might have lots of <0,1,0> normals), you can use normal_indices. For every
> triangle defined with face_indices, you'd need to index which normals you
> want to use.
>
> Regards,
> Tim
>
> --
> "Tim Nikias v2.0"
> Homepage: <http://www.nolights.de>


Like Tim says , you must each vertex normals. But common sides's vertex
numbers
must same. For normal calc, My visual basic code :

'    x1 , x2, x3 vertex point.

    Dim v1(2) As Single, v2(2) As Single
    Dim nX As Single, nY As Single, nZ As Single


    ' Calculate two vectors from the three points
    v1(0) = X2 - x1
    v1(1) = Y2 - y1
    v1(2) = z2 - z1

    v2(0) = x3 - x1
    v2(1) = y3 - y1
    v2(2) = z3 - z1

    ' Take the cross product of 2 vectors to get the normal
    ' vector which will be stored in out
    nX = (v1(1) * v2(2)) - (v1(2) * v2(1))
    nZ = (v1(2) * v2(0)) - (v1(0) * v2(2))
    nY = (v1(0) * v2(1)) - (v1(1) * v2(0))

Regards.

Hasan

Post a reply to this message

Wasn't it jessy who wrote:
>thanks,Hasan3,
>I just saw the information about normal vector.it says that the
>normal_vectors{}  is the vertex's normal and If the number of normals
>equals the number of vertices then the normal_indices{} list is optional
>and the indexes from the face_indices{} list are used instead.
>   I don't understand the normal_indices{} is record for what?HOw it relate
>to normal_vectors{}?it seems   like face_indices{} in the example.
>   if I can get the face's normal,can use it?how?thanks.

If you want an object to be smooth everywhere, then each vertex should
only have one normal. The normals on all the faces that meet at the
point match, so there's a smooth transition from one face to another.

On the other hand, if you want your object to have sharp edges somewhere
(e.g. around the edge of the circle in the middle of your shape) then
points on the edge should have two normals (or more if you had wanted
sharp points, which you don't). A face outside the circle would have one
normal at an edge point, and a face inside the circle has a different
normal at the same point. This gives a discontinuity in the normals and
creates a sharp edge.

It is also possible to achieve the same effect by duplicating the edge
points. You could have two vertices at the same location, one with a
normal that matches the inside slope and one that matches the outside
slope. 

-- 
Mike Williams
Gentleman of Leisure

Post a reply to this message