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cchiw |
3281 |
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// set camera, image, and rendering parameters
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input vec3 camEye = [-194.602, -4.82922, 910.873];
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input vec3 camAt = [-2.36389, 93.121, 661.166];
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input vec3 camUp = [0.0745335, -0.946525, -0.313904];
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input real camNearAtRel = -50;
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input real camFarAtRel = 20;
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input real camFOV = 15.5;
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input int iresU = 410;
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input int iresV = 450;
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input real refStep = 1;
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input real rayStep = 0.06;
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input vec3 lightVsp = [-2, -3, -4];
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input real phongKa = 0.3;
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input real phongKd = 0.7;
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input real thickness = 0.3;
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field#4(3)[] V = bspln5 ⊛ image("moe-iso-b3i5-small.nrrd");
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field#0(3)[3] g= ∇V;
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field#0(3)[3,3] H = ∇⊗∇V;
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field#0(3)[3,3,3] T = ∇⊗∇⊗∇V;
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//tmp
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field#0(3)[] M = |g|;
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field#0(3)[3] N = g/M;
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field#0(3)[3] t0 = g•H+ H•g;
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field#0(3)[3] t2 = (1/2)*t0/M;
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field#0(3)[3,3] t3 = H•H+ g•T+ T•g+H•H;
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field#0(3)[3,3] t5 =(1/2)*(t3*M-t0⊗t2)/(M*M);
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field#0(3)[3,3] t4 = (H*M- g⊗t2)/M*M; // ∇N
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field#0(3)[] S = N•t5•N; // ∇V/|∇V| • ∇⊗∇(|∇V|) • ∇V/|∇V|
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field#0(3)[] F = -t2•N; //-∇(|∇V|) • ∇V/|∇V|;
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field#0(3)[3] dF =(-1/2)*(((t0/M)•t4)+N•t3);
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input real smax = -10;
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function real alpha(real v, real g) = clamp(0, 1, 1.3*(1 - |v|/(g*thickness)));
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field#0(1)[3] cmap = tent ⊛ image("moe-isobow.nrrd");
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function vec3 color(vec3 x) = cmap(clamp(-1200,3300,V(x)));
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function real mask(vec3 x) = 1.0 if (S(x) < smax) else 0.0; // NOTISO
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// (boilerplate) computation of camera and light info
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real camDist = |camAt - camEye|;
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real camNear = camNearAtRel + camDist;
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real camFar = camFarAtRel + camDist;
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vec3 camN = normalize(camAt - camEye); // away
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vec3 camU = normalize(camN × camUp); // right
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vec3 camV = camU × camN; // up
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real camVmax = tan(camFOV*π/360)*camDist;
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real camUmax = camVmax*iresU/iresV;
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vec3 light = transpose([camU,camV,camN])•normalize(lightVsp);
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strand raycast(int ui, int vi) {
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real rayU = lerp(-camUmax, camUmax, -0.5, ui, iresU-0.5);
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real rayV = lerp(camVmax, -camVmax, -0.5, vi, iresV-0.5);
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real rayN = camNear;
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vec3 rayVec = camN + (rayU*camU + rayV*camV)/camDist;
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real transp = 1;
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vec3 rgb = [0,0,0];
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output vec4 rgba = [0,0,0,0];
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update {
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vec3 x = camEye + rayN*rayVec;
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if (inside(x,V)) {
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real val = F(x);
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vec3 grad = -dF(x);
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real a = alpha(val, |grad|)*mask(x);
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if (a > 0) { // we have some opacity
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a = 1 - pow(1-a, rayStep*|rayVec|/refStep);
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real depth = lerp(1.1, 0.7, camNear, rayN, camFar);
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real shade = max(0, normalize(grad)•light);
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rgb += transp*a*depth*(phongKa + phongKd*shade)*color(x);
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transp *= 1 - a;
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}
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}
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if (transp < 0.01) { // early ray termination
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transp = 0;
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stabilize;
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}
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if (rayN > camFar) {
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stabilize;
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}
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rayN = rayN + rayStep;
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}
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stabilize {
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real a = 1-transp;
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if (a > 0) rgba = [rgb[0]/a, rgb[1]/a, rgb[2]/a, a];
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}
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}
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initially [ raycast(ui, vi) | vi in 0..iresV-1, ui in 0..iresU-1 ];
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