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Revision 661 - (download) (annotate)
Tue Mar 22 01:28:11 2011 UTC (8 years, 8 months ago) by glk
File size: 697 byte(s)
tweaked background value
// 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 = real(dataSize)*(real(row)+0.5)/real(imgSize) - 0.5;
    real cc = real(dataSize)*(real(col)+0.5)/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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