cesiumDemo/Source/Shaders/Builtin/Constants/ellipsoidInverseRadii.glsl

/**
 * The reciprocal of the radius of the WGS84 ellipsoid.
 *
 * @name czm_ellipsoidInverseRadii
 * @glslConstant
 */
const vec3 czm_ellipsoidInverseRadii = vec3(1.0 / 6378137.0, 1.0 / 6378137.0, 1.0 / 6356752.314245);