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View of /trunk/test/zslice-hess.diderot

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Revision 1383 - (download) (annotate)
Thu Jun 23 20:24:04 2011 UTC (8 years ago) by jhr
File size: 801 byte(s)
  merging changes from pure-cfg
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("../data/zimg11.nrrd");
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 real val = 0.0; 

    update
    {
        if (inside (pos,F)) {
	    tensor[3,3] H = ∇⊗∇F(pos);
	    val = trace(∇⊗∇F(pos));
            // can compare with following; tests subscripting
	    // val = H[0,0] + H[1,1] + H[2,2];
	}
        stabilize;
    }
}

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

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