Print Page - Ray Marching Voxel based Cube World ?

Hi
I'm trying to implement a Minecraft type Voxel world using cubes - using Ray Marching.

I'm using 3d perlin noise to 'cut' away areas in an infinite field of cubes.
My problem is that I'm getting lots of unpleasant artifacts like banding and rough, broken looking edges around the geometry. Pictures attached.
The Ray Marching engine I'm using was written by someone else, so most of the variables look alien to me, and I'm having to guess what the problem might be by changing various constants I see.

Here's my method for cube voxels. Maybe there is a better way, that will get rid of the artifacts, or maybe someone could suggest which parts of the Ray Marching engine I should look at which is responsible. Thanks.

Code:

  
float finalModel(PVector p)
  {
    PVector cp=p.get();

    float boxsize=.150;
    PVector box=new PVector(boxsize, boxsize, boxsize);

    float w=.3;

    float x1=rounder(cp.x, w);
    float y1=rounder(cp.y, w);
    float z1=rounder(cp.z, w);
    cp.x-=x1;
    cp.y-=y1;
    cp.z-=z1;

    float s=.3;
    double val=(float)sn.noise(1000+x1*s, 1000+y1*s, 1000+z1*s);
    val=(val+1)/2;

    if (val<.8)
    {
      box.x=-.15;
      box.y=-.15;
      box.z=-.15;
    }

    float DE1=sdBox2(   cp, box);
    float bounds=sdBox2(   new PVector(p.x, p.y+3, p.z), new PVector(15, 3, 15));

 return max(DE1, bounds);

float rounder(float ii, float vv) {
  return round(ii/vv) * vv;
}

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Fractal Software => Programming => Topic started by: glennmarshall on August 29, 2013, 11:59:26 AM