EnvMap generated with CubeCamera looks magnified

[felixmariotto]

Did you try to put the cubeCamera at the same position as the camera you use for rendering ? You can hide the glasses and glass frames from the cubeCamera with layers, to keep only the two stems in the resulting envmap. This way I suppose the glass material with refractionRatio will show a distorted image of the glasses stems from the point of view of the camera, which is what you want to achieve.