There are some artifact when using bounding method +b2 with the current beta
12a version. Also it seems that fog gives quite different result in the
scene. Maybe it is intentional redesign of this feature, I don't know.

// the definition of fog in the scene
fog {
    fog_type   2
    distance   50000
    color      rgbt <0.8,0.9,1.0,0.0>
    fog_offset 300
    fog_alt    900
}

"Square" artifacts appear in the shadows of the trees. They are created with
MeshTree macro by Paul T. Dawson.

// the definition of meshtree objects
#include "colors.inc"
  #include "meshcone.inc"
  #include "meshtreea.inc"
  #declare drzewo = MeshTree (

    8,    // Number_Of_Large_Branches
    8,    // Number_Of_Medium_Branches
    8,    // Number_Of_Small_Branches
    20,   // Number_Of_Leaves

    20,   // Branch_Minimum_Angle
    140,  // Branch_Maximum_Angle

    10,   // Tree_Trunk_Size
    4,    // Large_Branch_Size_Min
    5,    // Large_Branch_Size_Max
    2,    // Medium_Branch_Size_Min
    3,    // Medium_Branch_Size_Max
    0.5,  // Small_Branch_Size_Min
    1,    // Small_Branch_Size_Max

    texture { pigment { DMFWood5 } },    // T_Tree_1
    texture { pigment { Jade } },        // T_Tree_2
    9432  // Seed_1
  )

  #declare r1=seed(0);
  #declare r2=seed(1);
  #declare pozycja = <0,0,0>;
  #fopen poz "Poz_drzew.inc" read // the file with position vectors of the
trees
  #declare i=0;
  #while (i<65 & defined(poz))
    #read (poz,pozycja)
    object {drzewo
      scale (1+(0.5-rand(r1))*.2)*40
      rotate y*rand(r2)*360
      translate <pozycja.x,-10,-pozycja.y>
    }
    #declare i=i+1;
  #end //while

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"Przemek Loesch" <nomail@nomail> wrote in message
news:web.44311081c37f5c7db0aac12c0@news.povray.org...
> There are some artifact when using bounding method +b2 with the current beta
> 12a version. Also it seems that fog gives quite different result in the
> scene. Maybe it is intentional redesign of this feature, I don't know.

Without a complete scene file it's pretty difficult to narrow down, but does it
happen when you run the beta with the /THREADS 1 command line switch?

This unusual behaviour may already have been fixed however, as a few similar
artifact problems were experienced by other people (see povray.beta-test, thread
"POV-Ray v3.7.beta.12a available.", and in particular posts by LoneStar) which
have now been corrected for the next release.

Lance.

thezone - thezone.firewave.com.au

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I'm unable to narrow down the scene which would still generate this
artifact.
The scene is quite complex. Beside the trees there are many meshes imported
with PoseRay, including several cars, trucks, and buildings. I've tried to
switch off these elements step by step, but everytime the artifact and the
place where it occurs has changed. I think this behavior is related to the
complexity of the scene rather then to specific position and geometry of
the objects.
By the way - the brighter appearance of the images rendered by 3.7beta had
nothing to do with the fog - I was mistaken. I've noticed also that it was
rendered correctly when I've put directive #version 3.5 (but #version 3.6
gives the same brighter result).

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