Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 | //This file is automatically rebuilt by the Cesium build process.
export default "precision highp float;\n\
\n\
in vec2 v_textureCoordinates;\n\
\n\
uniform vec3 u_faceDirection; // Current cubemap face\n\
uniform vec3 u_positionWC;\n\
uniform mat4 u_enuToFixedFrame;\n\
uniform vec4 u_brightnessSaturationGammaIntensity;\n\
uniform vec4 u_groundColor; // alpha component represent albedo\n\
\n\
vec4 getCubeMapDirection(vec2 uv, vec3 faceDir) {\n\
vec2 scaledUV = uv * 2.0 - 1.0;\n\
\n\
if (faceDir.x != 0.0) {\n\
return vec4(faceDir.x, scaledUV.x * faceDir.x, -scaledUV.y, 0.0);\n\
} else if (faceDir.y != 0.0) {\n\
return vec4(scaledUV.x, -scaledUV.y * faceDir.y, faceDir.y, 0.0);\n\
} else {\n\
return vec4(scaledUV.x * faceDir.z, -faceDir.z, -scaledUV.y, 0.0); \n\
}\n\
}\n\
\n\
void main() { \n\
float height = length(u_positionWC);\n\
float atmosphereInnerRadius = u_radiiAndDynamicAtmosphereColor.y;\n\
float ellipsoidHeight = max(height - atmosphereInnerRadius, 0.0);\n\
\n\
// Scale the position to ensure the sky color is present, even when underground.\n\
vec3 positionWC = u_positionWC / height * (ellipsoidHeight + atmosphereInnerRadius);\n\
\n\
float atmosphereOuterRadius = u_radiiAndDynamicAtmosphereColor.x;\n\
float atmosphereHeight = atmosphereOuterRadius - atmosphereInnerRadius;\n\
\n\
vec3 direction = (u_enuToFixedFrame * getCubeMapDirection(v_textureCoordinates, u_faceDirection)).xyz;\n\
vec3 normalizedDirection = normalize(direction);\n\
\n\
czm_ray ray = czm_ray(positionWC, normalizedDirection);\n\
czm_raySegment intersection = czm_raySphereIntersectionInterval(ray, vec3(0.0), atmosphereInnerRadius);\n\
if (!czm_isEmpty(intersection)) {\n\
intersection = czm_rayEllipsoidIntersectionInterval(ray, vec3(0.0), czm_ellipsoidInverseRadii);\n\
}\n\
\n\
bool onEllipsoid = intersection.start >= 0.0;\n\
float rayLength = czm_branchFreeTernary(onEllipsoid, intersection.start, atmosphereOuterRadius);\n\
\n\
// Compute sky color for each position on a sphere at radius centered around the provided position's origin\n\
vec3 skyPositionWC = positionWC + normalizedDirection * rayLength;\n\
\n\
float lightEnum = u_radiiAndDynamicAtmosphereColor.z;\n\
vec3 lightDirectionWC = normalize(czm_getDynamicAtmosphereLightDirection(skyPositionWC, lightEnum));\n\
vec3 mieColor;\n\
vec3 rayleighColor;\n\
float opacity;\n\
czm_computeScattering(\n\
ray,\n\
rayLength,\n\
lightDirectionWC,\n\
atmosphereInnerRadius, \n\
rayleighColor,\n\
mieColor,\n\
opacity\n\
);\n\
\n\
vec4 atmopshereColor = czm_computeAtmosphereColor(ray, lightDirectionWC, rayleighColor, mieColor, opacity);\n\
\n\
#ifdef ATMOSPHERE_COLOR_CORRECT\n\
const bool ignoreBlackPixels = true;\n\
atmopshereColor.rgb = czm_applyHSBShift(atmopshereColor.rgb, czm_atmosphereHsbShift, ignoreBlackPixels);\n\
#endif\n\
\n\
vec3 lookupDirection = -normalizedDirection;\n\
// Flipping the X vector is a cheap way to get the inverse of czm_temeToPseudoFixed, since that's a rotation about Z.\n\
lookupDirection.x = -lookupDirection.x;\n\
lookupDirection = -normalize(czm_temeToPseudoFixed * lookupDirection);\n\
lookupDirection.x = -lookupDirection.x;\n\
\n\
// Values outside the atmopshere are rendered as black, when they should be treated as transparent\n\
float skyAlpha = clamp((1.0 - ellipsoidHeight / atmosphereHeight) * atmopshereColor.a, 0.0, 1.0);\n\
skyAlpha = czm_branchFreeTernary(length(atmopshereColor.rgb) <= czm_epsilon7, 0.0, skyAlpha); // Treat black as transparent\n\
\n\
// Blend starmap with atmopshere scattering\n\
float intensity = u_brightnessSaturationGammaIntensity.w;\n\
vec4 sceneSkyBoxColor = czm_textureCube(czm_environmentMap, lookupDirection);\n\
vec3 skyBackgroundColor = mix(czm_backgroundColor.rgb, sceneSkyBoxColor.rgb, sceneSkyBoxColor.a);\n\
vec4 combinedSkyColor = vec4(mix(skyBackgroundColor, atmopshereColor.rgb * intensity, skyAlpha), 1.0);\n\
\n\
// Compute ground color based on amount of reflected light, then blend it with ground atmosphere based on height\n\
vec3 up = normalize(positionWC);\n\
float occlusion = max(dot(lightDirectionWC, up), 0.05);\n\
vec4 groundColor = vec4(u_groundColor.rgb * u_groundColor.a * (vec3(intensity * occlusion) + atmopshereColor.rgb), 1.0);\n\
vec4 blendedGroundColor = mix(groundColor, atmopshereColor, clamp(ellipsoidHeight / atmosphereHeight, 0.0, 1.0));\n\
\n\
vec4 color = czm_branchFreeTernary(onEllipsoid, blendedGroundColor, combinedSkyColor);\n\
\n\
float brightness = u_brightnessSaturationGammaIntensity.x;\n\
float saturation = u_brightnessSaturationGammaIntensity.y;\n\
float gamma = u_brightnessSaturationGammaIntensity.z;\n\
\n\
#ifdef ENVIRONMENT_COLOR_CORRECT\n\
color.rgb = mix(vec3(0.0), color.rgb, brightness);\n\
color.rgb = czm_saturation(color.rgb, saturation);\n\
#endif\n\
color.rgb = pow(color.rgb, vec3(gamma)); // Normally this would be in the ifdef above, but there is a precision issue with the atmopshere scattering transmittance (alpha). Having this line is a workaround for that issue, even when gamma is 1.0.\n\
color.rgb = czm_gammaCorrect(color.rgb);\n\
\n\
out_FragColor = color;\n\
}\n\
";
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