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View of /branches/fem/test/vr.diderot

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Revision 3210 - (download) (annotate)
Mon Jul 13 14:39:06 2015 UTC (4 years ago) by cchiw
File size: 646 byte(s)
creating a copy of branch of vis12
// vr.diderot
//
// volume rendering example in Diderot
//

input real stepSz;		// size of steps
input vec<3> light;
input int wid = 640;
input int ht = 480;

input image[3] img;

field#1[3] F = convolve (bspln3, img);
 
strand RayCast (int row, int col)
{
    vec<3>	dir = (real(row), real(col), 0.0);
    vec<3>	pos = (0.0, 0.0, 0.0);
    real	t = 0.0;
    real[4]	color = (0.0, 0.0, 0.0, 0.0);	

    update
    {
	vec<3> pt = pos + t*dir;
	t = t + stepSz;
	vec<3> g = (D F)@pt;
	color = over(color, phong(light, g, txf(F@pt)));
	if (color[3] >= 0.999)
	    stabilize;
    }

}

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

root@smlnj-gforge.cs.uchicago.edu
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