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- //This file is automatically rebuilt by the Cesium build process.
- export default "/**\n\
- * Computes a 3x3 rotation matrix that transforms vectors from an ellipsoid's east-north-up coordinate system \n\
- * to eye coordinates. In east-north-up coordinates, x points east, y points north, and z points along the \n\
- * surface normal. East-north-up can be used as an ellipsoid's tangent space for operations such as bump mapping.\n\
- * <br /><br />\n\
- * The ellipsoid is assumed to be centered at the model coordinate's origin.\n\
- *\n\
- * @name czm_eastNorthUpToEyeCoordinates\n\
- * @glslFunction\n\
- *\n\
- * @param {vec3} positionMC The position on the ellipsoid in model coordinates.\n\
- * @param {vec3} normalEC The normalized ellipsoid surface normal, at <code>positionMC</code>, in eye coordinates.\n\
- *\n\
- * @returns {mat3} A 3x3 rotation matrix that transforms vectors from the east-north-up coordinate system to eye coordinates.\n\
- *\n\
- * @example\n\
- * // Transform a vector defined in the east-north-up coordinate \n\
- * // system, (0, 0, 1) which is the surface normal, to eye \n\
- * // coordinates.\n\
- * mat3 m = czm_eastNorthUpToEyeCoordinates(positionMC, normalEC);\n\
- * vec3 normalEC = m * vec3(0.0, 0.0, 1.0);\n\
- */\n\
- mat3 czm_eastNorthUpToEyeCoordinates(vec3 positionMC, vec3 normalEC)\n\
- {\n\
- vec3 tangentMC = normalize(vec3(-positionMC.y, positionMC.x, 0.0)); // normalized surface tangent in model coordinates\n\
- vec3 tangentEC = normalize(czm_normal3D * tangentMC); // normalized surface tangent in eye coordiantes\n\
- vec3 bitangentEC = normalize(cross(normalEC, tangentEC)); // normalized surface bitangent in eye coordinates\n\
- \n\
- return mat3(\n\
- tangentEC.x, tangentEC.y, tangentEC.z,\n\
- bitangentEC.x, bitangentEC.y, bitangentEC.z,\n\
- normalEC.x, normalEC.y, normalEC.z);\n\
- }\n\
- ";
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