Annotation of /trunk/test/vr-phong.diderot

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Revision 49 - (view) (download)

1 :	glk	46	// vr.diderot
2 :			//
3 :			// volume rendering example in Diderot
4 :			//
5 :
6 :			input string dataFile; // name of dataset
7 :			input real stepSz; // size of steps
8 :			input vec<3> lightDir;
9 :			input vec<3> lightCol;
10 :			input vec<3> eye; // location of eye point
11 :			input vec<3> orig; // location of pixel (0,0)
12 :			input vec<3> cVec; // vector between pixels horizontally
13 :			input vec<3> rVec; // vector between pixels vertically
14 :			input real pka;
15 :			input real pkd;
16 :			input real pks;
17 :			input real psh;
18 :
19 :			image[3] img = load (dataFile);
20 :
21 :			field#1[3] F = convolve (bspln3, img);
22 :	glk	49
23 :			field#0<4>[1] txf = convolve (tent, load("txf-rgba.nrrd"));
24 :	glk	46
25 :			actor RayCast (int row, int col)
26 :			{
27 :			vec<3> pos = orig + row*rVec + col*cVec;
28 :			vec<3> dir = pos - eye/|pos - eye|;
29 :			real t = 0.0;
30 :			vec<3> rayRGB = (0.0, 0.0, 0.0);
31 :			real rayTransp = 1.0;
32 :
33 :			update
34 :			{
35 :			if (inside (pos,F)) {
36 :			real val = F@pos;
37 :			vec<3> grad = (D F)@pos;
38 :			vec<3> norm = grad/|grad|;
39 :			vec<3> half = lightDir - dir/|lightDir - dir|;
40 :	glk	49	vec<4> matRGBA = txf@val;
41 :	glk	46	vec<3> matRGB = (matRGBA[0],matRGBA[1],matRGBA[2]);
42 :			real ldotn = dot(lightDir,norm);
43 :			real hdotn = dot(halfDir,norm);
44 :			// hey the per-component multiplication is in matRGB*lightRGB
45 :			vec<3> pntRGB = (ka + kd*ldotn)*matRGB*lightRGB + ks*pow(hdotn,psh)*lightRGB;
46 :			rayRGB = rayRGB + rayTranps*matRGBA[3]*matRGB;
47 :			rayTransp = rayTranps*(1.0 - matRGBA[3]);
48 :			}
49 :			if (t > 1.0 || rayTransp < 0.01) // a little odd; ray terminates at length=1
50 :			stabilize;
51 :			pos = pos + stepSz*dir;
52 :			t = t + stepSz;
53 :			}
54 :
55 :
56 :			}

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