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View of /branches/vis12/test/hlic/hlic-BUG8.diderot

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Revision 1762 - (download) (annotate)
Thu Mar 22 18:41:17 2012 UTC (8 years, 7 months ago) by jhr
File size: 1231 byte(s)
  Update with comments about bugs
// BUG:
// this program does not terminate.  The issue is that the body of the
// "if (dir > 0.0)" is empty in the generated C code.
// The bug appears to be in the HighIL normalization.
//

int imgSize = 200;
real h = 0.25;    // step size of integration
int stepNum = 5; // take this many steps both upstream and downstream

field#1(2)[2] V = load("tor2slice-vec0.nrrd") ⊛ ctmr;
field#0(2)[] R = load("tor2slice-rand.nrrd") ⊛ tent;

strand LIC (int xi, int yi) {
    real xx = lerp(0.0, 79.0, -0.5, real(xi), real(imgSize)-0.5);
    real yy = lerp(0.0, 79.0, -0.5, real(yi), real(imgSize)-0.5);
    vec2 pos0 = [xx,yy];
    vec2 pos0backup = [xx,yy];
    vec2 pos = pos0;
    vec2 step = [0.0,0.0];
    output vec3 out = [0.0,0.0,0.0];
    real sum = 0.0;
    int num = 0;
    real dir = 1.0;

    update {
      step = h*dir*V(pos);
      if (inside(pos + step, V) && inside(pos + step, R)) {
        pos += step;
      }
      if (num == stepNum) {
	if (dir > 0.0) {
	  num = 0;
	  pos = pos0backup;
	  dir = -1.0;
	}
	else
	  stabilize;
      }
      sum += R(pos);
      num += 1;
    }

    stabilize {
      out = [pos[0], pos[1], sum];
    }
}

initially [ LIC(xi, yi) | yi in 0..(imgSize-1), xi in 0..(imgSize-1) ];

root@smlnj-gforge.cs.uchicago.edu
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