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Revision 1685 - (download) (annotate)
Sun Jan 22 15:23:36 2012 UTC (7 years, 8 months ago) by jhr
Original Path: branches/vis12/test/zslice-grad.diderot
File size: 729 byte(s)
  Create a branch to implement things that we need for the Vis 2012 paper
// zslice-grad

string dataFile = "../data/zimg11.nrrd";
int dataSize = 11;
int imgSize = 200;
vec3 orig = [0.0, 0.0, 5.0];
vec3 cVec = [0.0, 1.0, 0.0];
vec3 rVec = [1.0, 0.0, 0.0];
image(3)[] img = load (dataFile);
field#2(3)[] F = img ⊛ bspln3;

strand RayCast (int row, int col)
{
    real rr = lerp(-0.5, real(dataSize)-0.5, -0.5, real(row), real(imgSize)-0.5);
    real cc = lerp(-0.5, real(dataSize)-0.5, -0.5, real(col), real(imgSize)-0.5);
    vec3 pos = orig + rr*rVec + cc*cVec;
    output vec3 grad = [0.0, 0.0, 0.0];

    update
    {
	grad = ∇F@pos if inside (pos,F) else [0.0, 0.0, 0.1];
        stabilize;
    }

    /* output grad */
}

initially [ RayCast(r, c) | r in 0..(imgSize-1), c in 0..(imgSize-1) ];

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