<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=0" />
<title>WebGL Volume Viewer</title>
<script type="text/javascript" src="sharevol.js"></script>
<script type="text/javascript" src="/src/comp/Slicer.js"></script>
<script type="text/javascript" src="/src/comp/SliceView.js"></script>
<script type="text/javascript" src="/src/comp/Volume.js"></script>
<script type="text/javascript" src="/src/comp/GradientEditor.js"></script>
<script type="text/javascript" src="/src/comp/MoveWindow.js"></script>
<script type="text/javascript" src="/src/comp/Colour.js"></script>
<script type="text/javascript" src="/src/comp/ColourPicker.js"></script>
<script type="text/javascript" src="/src/comp/Popup.js"></script>
<script type="text/javascript" src="/src/comp/Palette.js"></script>
<script type="text/javascript" src="/src/comp/ViewMatrix.js"></script>
<script type="text/javascript" src="/src/comp/WebGL.js"></script>
<script type="text/javascript" src="/src/comp/WebGLProgram.js"></script>
<script id="volume-vs" type="x-shader/x-vertex">
precision highp float;
//Volume vertex shader
precision highp float;
attribute vec3 aVertexPosition;
void main(void)
{
gl_Position = vec4(aVertexPosition, 1.0);
}
</script>
<script id="volume-fs" type="x-shader/x-fragment">
precision highp float;
//Volume fragment shader
/*
* Copyright (c) 2014, Monash University. All rights reserved.
* Author: Owen Kaluza - owen.kaluza ( at ) monash.edu
*
* Licensed under the GNU Lesser General Public License
* https://www.gnu.org/licenses/lgpl.html
*/
precision highp float;
//Defined dynamically before compile...
//const vec2 slices = vec2(16.0,16.0);
//const int maxSamples = 256;
uniform sampler2D uVolume;
uniform sampler2D uTransferFunction;
uniform vec3 uBBMin;
uniform vec3 uBBMax;
uniform vec3 uResolution;
uniform bool uEnableColour;
uniform float uBrightness;
uniform float uContrast;
uniform float uSaturation;
uniform float uPower;
uniform mat4 uPMatrix;
uniform mat4 uInvPMatrix;
uniform mat4 uMVMatrix;
uniform mat4 uNMatrix;
uniform vec4 uViewport;
uniform int uSamples;
uniform float uDensityFactor;
uniform float uIsoValue;
uniform vec4 uIsoColour;
uniform float uIsoSmooth;
uniform int uIsoWalls;
uniform int uFilter;
uniform vec2 uRange;
uniform vec2 uDenMinMax;
//#define tex3D(pos) interpolate_tricubic_fast(pos)
//#define tex3D(pos) texture3Dfrom2D(pos).x
vec2 islices = vec2(1.0 / slices.x, 1.0 / slices.y);
vec4 texture3Dfrom2D(vec3 pos)
{
//Get z slice index and position between two slices
float Z = pos.z * slices.x * slices.y;
int slice = int(Z); //Index of first slice
//X & Y coords of sample scaled to slice size
vec2 sampleOffset = pos.xy * islices;
//Offsets in 2D texture of given slice indices
//(add offsets to scaled position within slice to get sample positions)
float A = float(slice) * islices.x;
float B = float(slice+1) * islices.x;
vec2 z1offset = vec2(fract(A), floor(A) / slices.y) + sampleOffset;
vec2 z2offset = vec2(fract(B), floor(B) / slices.y) + sampleOffset;
//Interpolate the final value by position between slices [0,1]
return mix(texture2D(uVolume, z1offset), texture2D(uVolume, z2offset), fract(Z));
}
float interpolate_tricubic_fast(vec3 coord);
float tex3D(vec3 pos)
{
if (uFilter > 0)
return interpolate_tricubic_fast(pos);
return texture3Dfrom2D(pos).x;
}
// It seems WebGL has no transpose
mat4 transpose(in mat4 m)
{
return mat4(
vec4(m[0].x, m[1].x, m[2].x, m[3].x),
vec4(m[0].y, m[1].y, m[2].y, m[3].y),
vec4(m[0].z, m[1].z, m[2].z, m[3].z),
vec4(m[0].w, m[1].w, m[2].w, m[3].w)
);
}
//Light moves with camera
const vec3 lightPos = vec3(0.5, 0.5, 5.0);
const float ambient = 0.2;
const float diffuse = 0.8;
const vec3 diffColour = vec3(1.0, 1.0, 1.0); //Colour of diffuse light
const vec3 ambColour = vec3(0.2, 0.2, 0.2); //Colour of ambient light
void lighting(in vec3 pos, in vec3 normal, inout vec3 colour)
{
vec4 vertPos = uMVMatrix * vec4(pos, 1.0);
vec3 lightDir = normalize(lightPos - vertPos.xyz);
vec3 lightWeighting = ambColour + diffColour * diffuse * clamp(abs(dot(normal, lightDir)), 0.1, 1.0);
colour *= lightWeighting;
}
vec3 isoNormal(in vec3 pos, in vec3 shift, in float density)
{
vec3 shiftpos = vec3(pos.x + shift.x, pos.y + shift.y, pos.z + shift.z);
vec3 shiftx = vec3(shiftpos.x, pos.y, pos.z);
vec3 shifty = vec3(pos.x, shiftpos.y, pos.z);
vec3 shiftz = vec3(pos.x, pos.y, shiftpos.z);
//Detect bounding box hit (walls)
if (uIsoWalls > 0)
{
if (pos.x <= uBBMin.x) return vec3(-1.0, 0.0, 0.0);
if (pos.x >= uBBMax.x) return vec3(1.0, 0.0, 0.0);
if (pos.y <= uBBMin.y) return vec3(0.0, -1.0, 0.0);
if (pos.y >= uBBMax.y) return vec3(0.0, 1.0, 0.0);
if (pos.z <= uBBMin.z) return vec3(0.0, 0.0, -1.0);
if (pos.z >= uBBMax.z) return vec3(0.0, 0.0, 1.0);
}
//Calculate normal
return vec3(density) - vec3(tex3D(shiftx), tex3D(shifty), tex3D(shiftz));
}
vec2 rayIntersectBox(vec3 rayDirection, vec3 rayOrigin)
{
//Intersect ray with bounding box
vec3 rayInvDirection = 1.0 / rayDirection;
vec3 bbMinDiff = (uBBMin - rayOrigin) * rayInvDirection;
vec3 bbMaxDiff = (uBBMax - rayOrigin) * rayInvDirection;
vec3 imax = max(bbMaxDiff, bbMinDiff);
vec3 imin = min(bbMaxDiff, bbMinDiff);
float back = min(imax.x, min(imax.y, imax.z));
float front = max(max(imin.x, 0.0), max(imin.y, imin.z));
return vec2(back, front);
}
void main()
{
//Compute eye space coord from window space to get the ray direction
mat4 invMVMatrix = transpose(uMVMatrix);
//ObjectSpace *[MV] = EyeSpace *[P] = Clip /w = Normalised device coords ->VP-> Window
//Window ->[VP^]-> NDC ->[/w]-> Clip ->[P^]-> EyeSpace ->[MV^]-> ObjectSpace
vec4 ndcPos;
ndcPos.xy = ((2.0 * gl_FragCoord.xy) - (2.0 * uViewport.xy)) / (uViewport.zw) - 1.0;
ndcPos.z = (2.0 * gl_FragCoord.z - gl_DepthRange.near - gl_DepthRange.far) /
(gl_DepthRange.far - gl_DepthRange.near);
ndcPos.w = 1.0;
vec4 clipPos = ndcPos / gl_FragCoord.w;
//vec4 eyeSpacePos = uInvPMatrix * clipPos;
vec3 rayDirection = normalize((invMVMatrix * uInvPMatrix * clipPos).xyz);
//Ray origin from the camera position
vec4 camPos = -vec4(uMVMatrix[3]); //4th column of modelview
vec3 rayOrigin = (invMVMatrix * camPos).xyz;
//Calc step
float stepSize = 1.732 / float(uSamples); //diagonal of [0,1] normalised coord cube = sqrt(3)
//Intersect ray with bounding box
vec2 intersection = rayIntersectBox(rayDirection, rayOrigin);
//Subtract small increment to avoid errors on front boundary
intersection.y -= 0.000001;
//Discard points outside the box (no intersection)
if (intersection.x <= intersection.y) discard;
vec3 rayStart = rayOrigin + rayDirection * intersection.y;
vec3 rayStop = rayOrigin + rayDirection * intersection.x;
vec3 step = normalize(rayStop-rayStart) * stepSize;
vec3 pos = rayStart;
float T = 1.0;
vec3 colour = vec3(0.0);
bool inside = false;
vec3 shift = uIsoSmooth / uResolution;
//Number of samples to take along this ray before we pass out back of volume...
float travel = distance(rayStop, rayStart) / stepSize;
int samples = int(ceil(travel));
float range = uRange.y - uRange.x;
if (range <= 0.0) range = 1.0;
//Scale isoValue
float isoValue = uRange.x + uIsoValue * range;
//Raymarch, front to back
for (int i=0; i < maxSamples; ++i)
{
//Render samples until we pass out back of cube or fully opaque
#ifndef IE11
if (i == samples || T < 0.01) break;
#else
//This is slower but allows IE 11 to render, break on non-uniform condition causes it to fail
if (i == uSamples) break;
if (all(greaterThanEqual(pos, uBBMin)) && all(lessThanEqual(pos, uBBMax)))
#endi
H5版的MR模型展示sharevol-master
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收藏 2.09MB RAR 举报
H5版的MR模型展示sharevol-master.rar （43个子文件） 
sharevol-master lib 
OK.js 62KB dat.gui.js 98KB gl-matrix.js 103KB default.json 3KB Makefile 1KB src comp ViewMatrix.js 1KB Popup.js 726B WebGL.js 5KB WebGLProgram.js 3KB SliceView.js 2KB ColourPicker.js 11KB Volume.js 27KB MoveWindow.js 2KB Slicer.js 11KB GradientEditor.js 7KB Palette.js 9KB Colour.js 8KB utils arguments.js 101KB shaders volumeShaderWEBGL.vert 120B textureShaderWEBGL.vert 429B lineShaderWEBGL.frag 93B volumeShaderWEBGL.frag 13KB lineShaderWEBGL.vert 502B textureShaderWEBGL.frag 2KB LICENSE 7KB shader texture.vs 513B texture.fs 2KB line.vs 617B volume.fs 15KB volume.vs 186B line.fs 163B .idea workspace.xml 6KB misc.xml 174B inspectionProfiles modules.xml 282B sharevol-master.iml 458B package-lock.json 27B
index.html 21KB .gitignore 10B
data.jpg 1.89MB sharevol.js 232KB index.css 1KB sharevol11.js 321KB Helper.js 239B资源评论
