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jhr |
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// vr-MIP-test.diderot
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//
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// test version of maximum intensity projection in Diderot
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//
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//string dataFile = "../data/txs.nrrd";
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//vec3 eye = [25.0, 15.0, 10.0];
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//vec3 orig = [8.83877,2.5911,7.65275];
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//vec3 cVec = [-0.0151831,0.0278357,0.0];
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//vec3 rVec = [0.0074887,0.00408474,-0.0305383];
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string dataFile = "../data/vfrhand-nohip.nhdr";
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vec3 eye = [127.331,-1322.05,272.53];
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vec3 orig = [122.835,17.7112,188.044];
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vec3 cVec = [-0.00403611,-0.029826,-0.244066];
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vec3 rVec = [-0.245595,-0.0112916,0.00544129];
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real stepSz = 0.5;
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jhr |
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image(3)[] img = load (dataFile);
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jhr |
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//field#2(3)[] F = img ⊛ bspln3;
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field#0(3)[] F = img ⊛ tent;
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jhr |
585 |
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strand RayCast (int row, int col)
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{
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int r = row; // for debugging
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int c = col; // for debugging
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vec3 pos = orig + real(row)*rVec + real(col)*cVec;
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vec3 dir = (pos - eye)/|pos - eye|;
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real t = 0.0;
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output real maxval = -∞;
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update
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{
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pos = pos + stepSz*dir;
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if (inside (pos,F)) {
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real val = F@pos;
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maxval = max(val, maxval);
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}
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if (t > 80.0)
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jhr |
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stabilize;
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t = t + stepSz;
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}
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/* render: output maxval */
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}
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jhr |
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initially [ RayCast(r, c) | r in 0..479, c in 0..639 ];
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