Annotation of /trunk/rtest/tests/vr-taxi/vr-taxi.diderot

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Revision 1208 - (view) (download)

1 :	glk	1208
2 :			// vr-taxi
3 :			//
4 :			// volume renders test axis dataset
5 :
6 :			vec3 camEye = [35.1699, 30.3308, 18.77];
7 :			vec3 camAt = [5.26698, 4.74983, 4.66349];
8 :			vec3 camUp = [0.0, 0.0, 1.0];
9 :			real camNear = -2.0;
10 :			real camFar = 4.0;
11 :			real camFOV = 9.5;
12 :			int imgResU = 320;
13 :			int imgResV = 240;
14 :			real rayStep = 0.1;
15 :			real valOpacMin = 0.2;
16 :			real valOpacMax = 0.5;
17 :			vec3 backRGB = [0.8, 0.9, 1.0];
18 :
19 :			real camDist = |camAt - camEye|;
20 :			real camVspNear = camDist + camNear;
21 :			real camVspFar = camDist + camFar;
22 :			vec3 camN = normalize(camAt - camEye);
23 :			vec3 camU = normalize(camN × camUp);
24 :			vec3 camV = camN × camU;
25 :			real camVmax = tan(camFOV*π/360.0)*camDist;
26 :			real camUmax = camVmax*real(imgResU)/real(imgResV);
27 :
28 :			vec3 lightVspDir = [0.9, -1.0, -2.5];
29 :			vec3 lightDir = normalize(lightVspDir[0]*camU + lightVspDir[1]*camV + lightVspDir[2]*camN);
30 :			vec3 lightRGB = [1.0, 0.9, 0.8];
31 :
32 :			real phongKa = 0.05;
33 :			real phongKd = 0.65;
34 :			real phongKs = 0.45;
35 :			real phongSp = 50.0;
36 :
37 :			field#1(3)[] F = ctmr ⊛ load("../../data/taxi.nrrd");
38 :
39 :			strand RayCast (int ui, int vi) {
40 :			real rayU = lerp(-camUmax, camUmax, -0.5, real(ui), real(imgResU)-0.5);
41 :			real rayV = lerp(-camVmax, camVmax, -0.5, real(vi), real(imgResV)-0.5);
42 :			vec3 rayVec = (camDist*camN + rayU*camU + rayV*camV)/camDist;
43 :			vec3 toEye = normalize(-rayVec);
44 :
45 :			real rayN = camVspNear;
46 :			real rayTransp = 1.0;
47 :			vec3 rayRGB = [0.0, 0.0, 0.0];
48 :			output vec3 outRGB = [0.0, 0.0, 0.0];
49 :
50 :			update {
51 :			vec3 rayPos = camEye + rayN*rayVec;
52 :			if (inside (rayPos,F)) {
53 :			real val = F(rayPos);
54 :			if (val > valOpacMin) { // we have some opacity
55 :			vec3 grad = ∇F(rayPos); // (here as easy target for optimization)
56 :			vec3 norm = normalize(-∇F(rayPos));
57 :			real alpha = min(1.0, lerp(0.0, 1.0, valOpacMin, val, valOpacMax));
58 :			real ld = max(0.0, norm • lightDir);
59 :			real hd = max(0.0, norm • normalize(lightDir + toEye));
60 :			// contrived assignment of RGB from XYZ, only sensible
61 :			vec3 matRGB = [lerp(0.2, 1.0, 1.0, rayPos[0], 8.0)^0.8,
62 :			lerp(0.2, 1.0, 1.0, rayPos[1], 8.0)^0.8,
63 :			lerp(0.2, 1.0, 1.0, rayPos[2], 8.0)^0.8];
64 :			vec3 pntRGB = (phongKa*matRGB
65 :			+ phongKd*ld*modulate(matRGB, lightRGB)
66 :			+ phongKs*hd^phongSp*lightRGB);
67 :			rayRGB = rayRGB + rayTransp*alpha*pntRGB;
68 :			rayTransp = rayTransp*(1.0 - alpha);
69 :			}
70 :			}
71 :			if (rayTransp < 0.001) { // early ray termination
72 :			outRGB = rayRGB;
73 :			stabilize;
74 :			}
75 :			if (rayN > camVspFar) {
76 :			outRGB = lerp(rayRGB, backRGB, rayTransp);
77 :			stabilize;
78 :			}
79 :			rayN = rayN + rayStep;
80 :			}
81 :
82 :			}
83 :
84 :			initially [ RayCast(ui, vi) | vi in 0..(imgResV-1), ui in 0..(imgResU-1) ];

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