Annotation of /branches/pure-cfg/test/vr-lite-cam.diderot

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Revision 915 - (view) (download)

1 :	glk	693	// vr-lite-cam
2 :			//
3 :			// simple volume renderer, now with a single directional light,
4 :			// Phong shading, and the new camera.
5 :			//
6 :	glk	892	// The main thing missing from this is a more general transfer function
7 :			//
8 :			// process output with:
9 :	glk	915	// unu reshape -i mip.txt -s 4 480 345 | overrgb -i - -b 0.1 0.15 0.2 -g 1.2 -o - | unu quantize -b 8 -min 0 -max 255 -o vr-lite-cam.png
10 :	glk	693
11 :	glk	892	string dataFile = "../data/txs-pad3.nrrd";
12 :			vec3 camEye = [25.0, 15.0, 10.0];
13 :			vec3 camAt = [3.0, 3.0, 3.0];
14 :			vec3 camUp = [0.0, 0.0, 1.0];
15 :			real camNear = -5.0;
16 :			real camFar = 5.0;
17 :			real camFOV = 16.0;
18 :	glk	915	int imgResU = 480;
19 :			int imgResV = 345;
20 :	glk	892	real rayStep = 0.1;
21 :			real valOpacMin = 0.15; // highest value with opacity 0.0
22 :			real valOpacMax = 0.20; // lowest value with opacity 1.0
23 :
24 :			//string dataFile = "../data/vfrhand-nohip.nhdr";
25 :			//vec3 camEye = [127.331, -1322.05, 272.53];
26 :			//vec3 camAt = [63.0, 82.6536, 98.0];
27 :			//vec3 camUp = [0.9987, 0.0459166, -0.0221267];
28 :			//real camNear = -78.0;
29 :			//real camFar = 78.0;
30 :			//real camFOV = 5.0;
31 :	glk	790	//int imgResU = 480;
32 :			//int imgResV = 345;
33 :			//real rayStep = 0.1;
34 :	glk	892	//real valOpacMin = 400.0; // 400.0 for skin, 1150.0 for bone
35 :			//real valOpacMax = 700.0; // 700.0 for skin, 1450.0 for bone
36 :	glk	790
37 :	glk	693	real camDist = |camAt - camEye|;
38 :			real camVspNear = camDist + camNear;
39 :			real camVspFar = camDist + camFar;
40 :	glk	775	vec3 camN = normalize(camAt - camEye);
41 :	glk	773	vec3 camU = normalize(camN × camUp);
42 :			vec3 camV = camN × camU;
43 :	glk	696	real camVmax = tan(camFOV*3.1415926536/360.0)*camDist;
44 :	glk	693	real camUmax = camVmax*real(imgResU)/real(imgResV);
45 :
46 :			vec3 lightVspDir = [0.9, -1.0, -2.5];
47 :	glk	773	vec3 lightDir = normalize(lightVspDir[0]*camU + lightVspDir[1]*camV + lightVspDir[2]*camN);
48 :	glk	892	vec3 lightRGB = [1.0, 1.0, 1.0];
49 :	glk	693
50 :			real phongKa = 0.05;
51 :	glk	892	real phongKd = 0.65;
52 :			real phongKs = 0.45;
53 :			real phongSp = 50.0;
54 :	glk	693
55 :			image(3)[] img = load (dataFile);
56 :	jhr	704	//field#4(3)[] F = img ⊛ bspln5;
57 :	glk	773	field#2(3)[] F = img ⊛ bspln3;
58 :			//field#1(3)[] F = img ⊛ ctmr;
59 :	glk	907	//field#1(3)[] F = img ⊛ c1tent;
60 :	glk	693
61 :			strand RayCast (int ui, int vi)
62 :			{
63 :	glk	770	real rayU = lerp(-camUmax, camUmax, -0.5, real(ui), real(imgResU)-0.5);
64 :			real rayV = lerp(-camVmax, camVmax, -0.5, real(vi), real(imgResV)-0.5);
65 :	glk	693	vec3 rayVec = (camDist*camN + rayU*camU + rayV*camV)/camDist;
66 :
67 :			real rayN = camVspNear;
68 :			// ########## BEGIN per-ray initialization
69 :	glk	892	real rayTransp = 1.0;
70 :			vec3 rayRGB = [0.0, 0.0, 0.0];
71 :	glk	915	output vec4 outRGBA = [0.0, 0.0, 0.0, 0.0];
72 :	glk	693	// ########## END per-ray initialization
73 :
74 :			update
75 :			{
76 :			vec3 rayPos = camEye + rayN*rayVec;
77 :			if (inside (rayPos,F)) {
78 :			// ########## BEGIN per-sample code
79 :	jhr	903	real val = F(rayPos);
80 :			vec3 grad = ∇F(rayPos); // (here as easy target for optimization)
81 :			vec3 norm = normalize(-∇F(rayPos));
82 :	glk	693	if (val > valOpacMin) { // we have some opacity
83 :	glk	892	real alpha = min(1.0, lerp(0.0, 1.0, valOpacMin, val, valOpacMax));
84 :			real ld = max(0.0, norm • lightDir);
85 :			real hd = max(0.0, norm • normalize(lightDir + normalize(camEye - rayPos)));
86 :	glk	915	// contrived assignment of RGB from XYZ, only sensible
87 :			// for txs-pad3.nrrd, not for vfrhand-nohip.nhdr!!
88 :	glk	907	vec3 matRGB = [lerp(0.2, 1.0, 1.0, rayPos[0], 8.0),
89 :			lerp(0.2, 1.0, 1.0, rayPos[1], 8.0),
90 :			lerp(0.2, 1.0, 1.0, rayPos[2], 8.0)];
91 :	glk	892	vec3 pntRGB = (phongKa*matRGB
92 :			+ phongKd*ld*modulate(matRGB, lightRGB)
93 :			+ phongKs*hd^phongSp*lightRGB);
94 :			rayRGB = rayRGB + rayTransp*alpha*pntRGB;
95 :			rayTransp = rayTransp*(1.0 - alpha);
96 :	glk	693	}
97 :			// ########## END per-sample code
98 :			}
99 :	glk	892	if (rayTransp < 0.01) { // early ray termination
100 :			rayTransp = 0.0;
101 :	glk	915	outRGBA = [rayRGB[0], rayRGB[1], rayRGB[2], 1.0-rayTransp]; /* FIXME */
102 :	glk	780	stabilize;
103 :	glk	693	}
104 :	jhr	787	if (rayN > camVspFar) {
105 :	glk	915	outRGBA = [rayRGB[0], rayRGB[1], rayRGB[2], 1.0-rayTransp]; /* FIXME */
106 :	glk	780	stabilize;
107 :	glk	693	}
108 :	jhr	787	rayN = rayN + rayStep;
109 :	glk	693	}
110 :
111 :	glk	780	stabilize {
112 :	glk	915	// outRGBA = [rayRGB[0], rayRGB[1], rayRGB[2], 1.0-rayTransp];
113 :	glk	780	}
114 :
115 :	glk	693	}
116 :
117 :			initially [ RayCast(ui, vi) | vi in 0..(imgResV-1), ui in 0..(imgResU-1) ];

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