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jhr |
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/*! \file vr.diderot
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*
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* \author John Reppy
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*
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* simple volume renderer, with a single directional light,
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* Phong shading, and the new camera.
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*/
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jhr |
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jhr |
2061 |
/*
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jhr |
3349 |
* This code is part of the Diderot Project (http://diderot-language.cs.uchicago.edu)
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*
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* COPYRIGHT (c) 2015 The University of Chicago
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jhr |
2061 |
* All rights reserved.
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*/
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jhr |
2067 |
// input image
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input image(3)[] hand = image("data/vfrhand-nohip.nhdr");
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jhr |
2058 |
// image parameters
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input int imgResU = 480;
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input int imgResV = 345;
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jhr |
2067 |
input real rayStep = 0.5;
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jhr |
2058 |
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// camera controls
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input vec3 camEye = [127.331, -1322.05, 272.53];
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input vec3 camAt = [63.0, 82.6536, 98.0];
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input vec3 camUp = [0.9987, 0.0459166, -0.0221267];
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input real camNear = -78.0;
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input real camFar = 78.0;
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input real camFOV = 5.0;
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/* we control the opacity by its center value and the +/- keys */
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input real valOpacMid = 550.0; // 550 for skin, 1300.0 for bone
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real valOpacMin = valOpacMid - 150.0;
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real valOpacMax = valOpacMid + 150.0;
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real camDist = |camAt - camEye|;
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real camVspNear = camDist + camNear;
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real camVspFar = camDist + camFar;
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vec3 camN = normalize(camAt - camEye);
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vec3 camU = normalize(camN × camUp);
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vec3 camV = camN × camU;
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real camVmax = tan(camFOV*π/360.0)*camDist;
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real camUmax = camVmax*real(imgResU)/real(imgResV);
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vec3 lightVspDir = [0.9, -1.0, -2.5];
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vec3 lightDir = normalize(lightVspDir[0]*camU + lightVspDir[1]*camV + lightVspDir[2]*camN);
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//vec3 lightRGB = [1.0, 1.0, 1.0];
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real phongKa = 0.05;
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real phongKd = 0.65;
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real phongKs = 0.45;
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real phongSp = 50.0;
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jhr |
2067 |
field#2(3)[] F = bspln3 ⊛ hand;
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jhr |
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strand RayCast (int ui, int vi)
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{
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real rayU = lerp(-camUmax, camUmax, -0.5, real(ui), real(imgResU)-0.5);
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jhr |
2070 |
// we flip the v coordinate, since we are using DrawPixels to render the image
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real rayV = lerp(-camVmax, camVmax, -0.5, real(imgResV - vi - 1), real(imgResV)-0.5);
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jhr |
2058 |
vec3 rayVec = (camDist*camN + rayU*camU + rayV*camV)/camDist;
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vec3 toEye = normalize(-rayVec);
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real rayN = camVspNear;
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// ########## BEGIN per-ray initialization
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real rayTransp = 1.0;
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// vec3 rayRGB = [0.0, 0.0, 0.0];
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real rayGrey = 0.0;
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output vec4 outRGBA = [0.0, 0.0, 0.0, 0.0];
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// ########## END per-ray initialization
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update
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{
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vec3 rayPos = camEye + rayN*rayVec;
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if (inside (rayPos,F)) {
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// ########## BEGIN per-sample code
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real val = F(rayPos);
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if (val > valOpacMin) { // we have some opacity
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vec3 grad = ∇F(rayPos);
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vec3 norm = normalize(-∇F(rayPos));
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real alpha = min(1.0, lerp(0.0, 1.0, valOpacMin, val, valOpacMax));
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real ld = max(0.0, norm • lightDir);
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real hd = max(0.0, norm • normalize(lightDir + toEye));
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real pnt = phongKa
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+ phongKd * ld
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+ phongKs * hd^phongSp;
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rayGrey += rayTransp*alpha*pnt;
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rayTransp = rayTransp*(1.0 - alpha);
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}
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// ########## END per-sample code
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}
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if (rayTransp < 0.01) { // early ray termination
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rayTransp = 0.0;
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stabilize;
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}
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if (rayN > camVspFar) {
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stabilize;
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}
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rayN += rayStep;
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}
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stabilize {
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outRGBA = [rayGrey, rayGrey, rayGrey, 1.0-rayTransp];
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}
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}
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initially [ RayCast(ui, vi) | vi in 0..(imgResV-1), ui in 0..(imgResU-1) ];
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