Computes a 3x3 rotation matrix that transforms vectors from an ellipsoid's east-north-up coordinate system
to eye coordinates. In east-north-up coordinates, x points east, y points north, and z points along the
surface normal. East-north-up can be used as an ellipsoid's tangent space for operations such as bump mapping.
The ellipsoid is assumed to be centered at the model coordinate's origin.
The ellipsoid is assumed to be centered at the model coordinate's origin.
Example
// Transform a vector defined in the east-north-up coordinate // system, (0, 0, 1) which is the surface normal, to eye // coordinates. mat3 m = czm_eastNorthUpToEyeCoordinates(positionMC, normalEC); vec3 normalEC = m * vec3(0.0, 0.0, 1.0);