Added HSB color adjustment to the atmosphere and a sandcastle demo #3971
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,124 @@ | ||
| <!DOCTYPE html> | ||
| <html lang="en"> | ||
| <head> | ||
| <meta charset="utf-8"> | ||
| <meta http-equiv="X-UA-Compatible" content="IE=edge"> | ||
| <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no"> | ||
| <meta name="description" content="Adjust hue, saturation, and brightness of the sky/atmosphere."> | ||
| <meta name="cesium-sandcastle-labels" content="Showcases"> | ||
| <title>Cesium Demo</title> | ||
| <script type="text/javascript" src="../Sandcastle-header.js"></script> | ||
| <script type="text/javascript" src="../../../ThirdParty/requirejs-2.1.20/require.js"></script> | ||
| <script type="text/javascript"> | ||
| require.config({ | ||
| baseUrl : '../../../Source', | ||
| waitSeconds : 60 | ||
| }); | ||
| </script> | ||
| </head> | ||
| <body class="sandcastle-loading" data-sandcastle-bucket="bucket-requirejs.html"> | ||
| <style> | ||
| @import url(../templates/bucket.css); | ||
| #toolbar { | ||
| background: rgba(42, 42, 42, 0.8); | ||
| padding: 4px; | ||
| border-radius: 4px; | ||
| } | ||
| #toolbar input { | ||
| vertical-align: middle; | ||
| padding-top: 2px; | ||
| padding-bottom: 2px; | ||
| } | ||
| </style> | ||
| <div id="cesiumContainer" class="fullSize"></div> | ||
| <div id="loadingOverlay"><h1>Loading...</h1></div> | ||
| <div id="toolbar"> | ||
| <table> | ||
| <tbody><tr> | ||
| <td>hueShift</td> | ||
| <td> | ||
| <input type="range" min="-1" max="1" step="0.01" data-bind="value: hueShift, valueUpdate: 'input'"> | ||
| <input type="text" size="5" data-bind="value: hueShift"> | ||
| </td> | ||
| </tr> | ||
| <tr> | ||
| <td>saturationShift</td> | ||
| <td> | ||
| <input type="range" min="-1" max="1" step="0.01" data-bind="value: saturationShift, valueUpdate: 'input'"> | ||
| <input type="text" size="5" data-bind="value: saturationShift"> | ||
| </td> | ||
| </tr> | ||
| <tr> | ||
| <td>brightnessShift</td> | ||
| <td> | ||
| <input type="range" min="-1" max="1" step="0.01" data-bind="value: brightnessShift, valueUpdate: 'input'"> | ||
| <input type="text" size="5" data-bind="value: brightnessShift"> | ||
| </td> | ||
| </tr> | ||
| </tbody></table> | ||
| <div id="toggleLighting"></div> | ||
| <div id="toggleFog"></div> | ||
| </div> | ||
| <script id="cesium_sandcastle_script"> | ||
| function startup(Cesium) { | ||
| 'use strict'; | ||
| //Sandcastle_Begin | ||
| var viewer = new Cesium.Viewer('cesiumContainer'); | ||
| var scene = viewer.scene; | ||
| var skyAtmosphere = scene.skyAtmosphere; | ||
|
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| // The viewModel tracks the state of our mini application. | ||
| var viewModel = { | ||
| hueShift: 0.0, | ||
| saturationShift: 0.0, | ||
| brightnessShift: 0.0 | ||
| }; | ||
| // Convert the viewModel members into knockout observables. | ||
| Cesium.knockout.track(viewModel); | ||
|
|
||
| // Bind the viewModel to the DOM elements of the UI that call for it. | ||
| var toolbar = document.getElementById('toolbar'); | ||
| Cesium.knockout.applyBindings(viewModel, toolbar); | ||
|
|
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| // Make the skyAtmosphere's HSB parameters subscribers of the viewModel. | ||
| function subscribeParameter(name) { | ||
| Cesium.knockout.getObservable(viewModel, name).subscribe( | ||
| function(newValue) { | ||
| skyAtmosphere[name] = newValue; | ||
| } | ||
| ); | ||
| } | ||
|
|
||
| subscribeParameter('hueShift'); | ||
| subscribeParameter('saturationShift'); | ||
| subscribeParameter('brightnessShift'); | ||
|
|
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| Sandcastle.addToolbarButton('Toggle Lighting', function() { | ||
| scene.globe.enableLighting = !scene.globe.enableLighting; | ||
| }, 'toggleLighting'); | ||
|
|
||
| Sandcastle.addToolbarButton('Toggle Fog', function() { | ||
| scene.fog.enabled = !scene.fog.enabled; | ||
| }, 'toggleFog'); | ||
|
|
||
| var camera = viewer.camera; | ||
| camera.setView({ | ||
| destination : Cesium.Cartesian3.fromDegrees(-75.5847, 40.0397, 1000.0), | ||
| orientation: { | ||
| heading : -Cesium.Math.PI_OVER_TWO, | ||
| pitch : 0.2, | ||
| roll : 0.0 | ||
| } | ||
| }); | ||
|
|
||
| //Sandcastle_End | ||
| Sandcastle.finishedLoading(); | ||
| } | ||
| if (typeof Cesium !== "undefined") { | ||
| startup(Cesium); | ||
| } else if (typeof require === "function") { | ||
| require(["Cesium"], startup); | ||
| } | ||
| </script> | ||
| </body> | ||
| </html> |
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| Original file line number | Diff line number | Diff line change |
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@@ -32,15 +32,39 @@ | |
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| // Code: http://sponeil.net/ | ||
| // GPU Gems 2 Article: http://http.developer.nvidia.com/GPUGems2/gpugems2_chapter16.html | ||
| // HSV/HSB <-> RGB conversion with minimal branching: http://lolengine.net/blog/2013/07/27/rgb-to-hsv-in-glsl | ||
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| #ifdef COLOR_CORRECT | ||
| uniform vec3 u_hsbShift; // Hue, saturation, value | ||
| #endif | ||
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| const float g = -0.95; | ||
| const float g2 = g * g; | ||
| const vec4 K_RGB2HSB = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0); | ||
| const vec4 K_HSB2RGB = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0); | ||
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| varying vec3 v_rayleighColor; | ||
| varying vec3 v_mieColor; | ||
| varying vec3 v_toCamera; | ||
| varying vec3 v_positionEC; | ||
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| #ifdef COLOR_CORRECT | ||
| vec3 rgb2hsb(vec3 rgbColor) | ||
|
There was a problem hiding this comment. You could also experiment with the There was a problem hiding this comment. I think the addition of the brightness adjustment makes computing to/from HSB worthwhile. I'm not 100% sure how that works over in just RGB land. I think there's also less trig to do hue this way, czm_hue seems to involve an atan. There was a problem hiding this comment. Yeah true the brightness is nice to have. I'm fine with keeping it your way, and rgb2hsb and hsb2rgb could even be built-in functions themselves if we ever need them for other areas in the future. There was a problem hiding this comment. Should this be a new |
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| { | ||
| vec4 p = mix(vec4(rgbColor.bg, K_RGB2HSB.wz), vec4(rgbColor.gb, K_RGB2HSB.xy), step(rgbColor.b, rgbColor.g)); | ||
| vec4 q = mix(vec4(p.xyw, rgbColor.r), vec4(rgbColor.r, p.yzx), step(p.x, rgbColor.r)); | ||
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| float d = q.x - min(q.w, q.y); | ||
| return vec3(abs(q.z + (q.w - q.y) / (6.0 * d + czm_epsilon7)), d / (q.x + czm_epsilon7), q.x); | ||
| } | ||
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| vec3 hsb2rgb(vec3 hsbColor) | ||
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| { | ||
| vec3 p = abs(fract(hsbColor.xxx + K_HSB2RGB.xyz) * 6.0 - K_HSB2RGB.www); | ||
| return hsbColor.z * mix(K_HSB2RGB.xxx, clamp(p - K_HSB2RGB.xxx, 0.0, 1.0), hsbColor.y); | ||
| } | ||
| #endif | ||
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| void main (void) | ||
| { | ||
| // Extra normalize added for Android | ||
|
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@@ -52,6 +76,22 @@ void main (void) | |
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| vec3 rgb = rayleighPhase * v_rayleighColor + miePhase * v_mieColor; | ||
| rgb = vec3(1.0) - exp(-exposure * rgb); | ||
| // Compute luminance before color correction to avoid strangely gray night skies | ||
| float l = czm_luminance(rgb); | ||
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| #ifdef COLOR_CORRECT | ||
| // Convert rgb color to hsb | ||
| vec3 hsb = rgb2hsb(rgb); | ||
| // Perform hsb shift | ||
| hsb.x += u_hsbShift.x; // hue | ||
| hsb.y = clamp(hsb.y + u_hsbShift.y, 0.0, 1.0); // saturation | ||
| hsb.z = hsb.z > czm_epsilon7 ? hsb.z + u_hsbShift.z : 0.0; // brightness | ||
| // Convert shifted hsb back to rgb | ||
| rgb = hsb2rgb(hsb); | ||
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| // Check if correction decreased the luminance to 0 | ||
| l = min(l, czm_luminance(rgb)); | ||
| #endif | ||
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| gl_FragColor = vec4(rgb, min(smoothstep(0.0, 0.1, l), 1.0) * smoothstep(0.0, 1.0, czm_morphTime)); | ||
| } | ||
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Also include a link to where the new Sandcastle example will be hosted, e.g., for 3D models, the link is http://cesiumjs.org/Cesium/Apps/Sandcastle/index.html?src=3D%20Models.html&label=Showcases