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View of /branches/pure-cfg/test/zslice-grad.diderot

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Revision 770 - (download) (annotate)
Thu Apr 7 20:42:13 2011 UTC (8 years, 7 months ago) by glk
File size: 729 byte(s)
used lerp where possible, other cosmetic changes
// 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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