Annotation of /branches/charisee/rtest/tests/vr-taxi/vr-taxi.diderot

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1 :	jhr	3060	/*! \file vr-taxi.diderot
2 :			*
3 :			* \author Gordon Kindlmann
4 :			*
5 :			* volume renders test axis dataset
6 :			*/
7 :	glk	1208
8 :	jhr	3060	/*
9 :	jhr	3349	* This code is part of the Diderot Project (http://diderot-language.cs.uchicago.edu)
10 :			*
11 :			* COPYRIGHT (c) 2015 The University of Chicago
12 :	jhr	3060	* All rights reserved.
13 :			*/
14 :	glk	1208
15 :			vec3 camEye = [35.1699, 30.3308, 18.77];
16 :			vec3 camAt = [5.26698, 4.74983, 4.66349];
17 :	jhr	3060	vec3 camUp = [0, 0, 1];
18 :	glk	1208	real camNear = -2.0;
19 :			real camFar = 4.0;
20 :			real camFOV = 9.5;
21 :			int imgResU = 320;
22 :			int imgResV = 240;
23 :			real rayStep = 0.1;
24 :			real valOpacMin = 0.2;
25 :			real valOpacMax = 0.5;
26 :			vec3 backRGB = [0.8, 0.9, 1.0];
27 :
28 :			real camDist = |camAt - camEye|;
29 :			real camVspNear = camDist + camNear;
30 :			real camVspFar = camDist + camFar;
31 :			vec3 camN = normalize(camAt - camEye);
32 :			vec3 camU = normalize(camN × camUp);
33 :			vec3 camV = camN × camU;
34 :	jhr	3060	real camVmax = tan(camFOV*π/360)*camDist;
35 :	glk	1208	real camUmax = camVmax*real(imgResU)/real(imgResV);
36 :
37 :			vec3 lightVspDir = [0.9, -1.0, -2.5];
38 :			vec3 lightDir = normalize(lightVspDir[0]*camU + lightVspDir[1]*camV + lightVspDir[2]*camN);
39 :			vec3 lightRGB = [1.0, 0.9, 0.8];
40 :
41 :			real phongKa = 0.05;
42 :			real phongKd = 0.65;
43 :			real phongKs = 0.45;
44 :			real phongSp = 50.0;
45 :
46 :	jhr	3060	field#1(3)[] F = ctmr ⊛ image("../../data/taxi.nrrd");
47 :	glk	1208
48 :			strand RayCast (int ui, int vi) {
49 :			real rayU = lerp(-camUmax, camUmax, -0.5, real(ui), real(imgResU)-0.5);
50 :			real rayV = lerp(-camVmax, camVmax, -0.5, real(vi), real(imgResV)-0.5);
51 :			vec3 rayVec = (camDist*camN + rayU*camU + rayV*camV)/camDist;
52 :			vec3 toEye = normalize(-rayVec);
53 :
54 :			real rayN = camVspNear;
55 :			real rayTransp = 1.0;
56 :	jhr	3060	vec3 rayRGB = [0, 0, 0];
57 :			output vec3 outRGB = [0, 0, 0];
58 :	glk	1208
59 :			update {
60 :			vec3 rayPos = camEye + rayN*rayVec;
61 :			if (inside (rayPos,F)) {
62 :			real val = F(rayPos);
63 :			if (val > valOpacMin) { // we have some opacity
64 :			vec3 grad = ∇F(rayPos); // (here as easy target for optimization)
65 :			vec3 norm = normalize(-∇F(rayPos));
66 :			real alpha = min(1.0, lerp(0.0, 1.0, valOpacMin, val, valOpacMax));
67 :			real ld = max(0.0, norm • lightDir);
68 :			real hd = max(0.0, norm • normalize(lightDir + toEye));
69 :			// contrived assignment of RGB from XYZ, only sensible
70 :			vec3 matRGB = [lerp(0.2, 1.0, 1.0, rayPos[0], 8.0)^0.8,
71 :			lerp(0.2, 1.0, 1.0, rayPos[1], 8.0)^0.8,
72 :			lerp(0.2, 1.0, 1.0, rayPos[2], 8.0)^0.8];
73 :			vec3 pntRGB = (phongKa*matRGB
74 :			+ phongKd*ld*modulate(matRGB, lightRGB)
75 :			+ phongKs*hd^phongSp*lightRGB);
76 :			rayRGB = rayRGB + rayTransp*alpha*pntRGB;
77 :	jhr	3060	rayTransp = rayTransp*(1 - alpha);
78 :	glk	1208	}
79 :			}
80 :			if (rayTransp < 0.001) { // early ray termination
81 :			outRGB = rayRGB;
82 :			stabilize;
83 :			}
84 :			if (rayN > camVspFar) {
85 :			outRGB = lerp(rayRGB, backRGB, rayTransp);
86 :			stabilize;
87 :			}
88 :			rayN = rayN + rayStep;
89 :			}
90 :
91 :			}
92 :
93 :			initially [ RayCast(ui, vi) | vi in 0..(imgResV-1), ui in 0..(imgResU-1) ];

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