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61 lines
2.6 KiB
JavaScript
61 lines
2.6 KiB
JavaScript
//This file is automatically rebuilt by the Cesium build process.
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export default "// Thanks for the contribution Jonas\n\
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// http://29a.ch/2012/7/19/webgl-terrain-rendering-water-fog\n\
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\n\
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uniform sampler2D specularMap;\n\
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uniform sampler2D normalMap;\n\
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uniform vec4 baseWaterColor;\n\
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uniform vec4 blendColor;\n\
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uniform float frequency;\n\
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uniform float animationSpeed;\n\
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uniform float amplitude;\n\
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uniform float specularIntensity;\n\
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uniform float fadeFactor;\n\
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\n\
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czm_material czm_getMaterial(czm_materialInput materialInput)\n\
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{\n\
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czm_material material = czm_getDefaultMaterial(materialInput);\n\
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\n\
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float time = czm_frameNumber * animationSpeed;\n\
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\n\
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// fade is a function of the distance from the fragment and the frequency of the waves\n\
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float fade = max(1.0, (length(materialInput.positionToEyeEC) / 10000000000.0) * frequency * fadeFactor);\n\
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\n\
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float specularMapValue = texture2D(specularMap, materialInput.st).r;\n\
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\n\
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// note: not using directional motion at this time, just set the angle to 0.0;\n\
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vec4 noise = czm_getWaterNoise(normalMap, materialInput.st * frequency, time, 0.0);\n\
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vec3 normalTangentSpace = noise.xyz * vec3(1.0, 1.0, (1.0 / amplitude));\n\
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\n\
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// fade out the normal perturbation as we move further from the water surface\n\
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normalTangentSpace.xy /= fade;\n\
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\n\
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// attempt to fade out the normal perturbation as we approach non water areas (low specular map value)\n\
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normalTangentSpace = mix(vec3(0.0, 0.0, 50.0), normalTangentSpace, specularMapValue);\n\
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\n\
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normalTangentSpace = normalize(normalTangentSpace);\n\
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\n\
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// get ratios for alignment of the new normal vector with a vector perpendicular to the tangent plane\n\
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float tsPerturbationRatio = clamp(dot(normalTangentSpace, vec3(0.0, 0.0, 1.0)), 0.0, 1.0);\n\
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\n\
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// fade out water effect as specular map value decreases\n\
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material.alpha = mix(blendColor.a, baseWaterColor.a, specularMapValue) * specularMapValue;\n\
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\n\
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// base color is a blend of the water and non-water color based on the value from the specular map\n\
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// may need a uniform blend factor to better control this\n\
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material.diffuse = mix(blendColor.rgb, baseWaterColor.rgb, specularMapValue);\n\
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\n\
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// diffuse highlights are based on how perturbed the normal is\n\
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material.diffuse += (0.1 * tsPerturbationRatio);\n\
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\n\
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material.diffuse = material.diffuse;\n\
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\n\
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material.normal = normalize(materialInput.tangentToEyeMatrix * normalTangentSpace);\n\
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\n\
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material.specular = specularIntensity;\n\
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material.shininess = 10.0;\n\
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\n\
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return material;\n\
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}\n\
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";
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