jtBaseApp/node_modules/@cesium/engine/Source/Shaders/Materials/NormalMapMaterial.js

//This file is automatically rebuilt by the Cesium build process.
export default "uniform sampler2D image;\n\
uniform float strength;\n\
uniform vec2 repeat;\n\
\n\
czm_material czm_getMaterial(czm_materialInput materialInput)\n\
{\n\
    czm_material material = czm_getDefaultMaterial(materialInput);\n\
    \n\
    vec4 textureValue = texture(image, fract(repeat * materialInput.st));\n\
    vec3 normalTangentSpace = textureValue.channels;\n\
    normalTangentSpace.xy = normalTangentSpace.xy * 2.0 - 1.0;\n\
    normalTangentSpace.z = clamp(1.0 - strength, 0.1, 1.0);\n\
    normalTangentSpace = normalize(normalTangentSpace);\n\
    vec3 normalEC = materialInput.tangentToEyeMatrix * normalTangentSpace;\n\
    \n\
    material.normal = normalEC;\n\
    \n\
    return material;\n\
}\n\
";