The lighting conditions could affect the system performances. If the shapes are clearly visible by the camera, and if the contrast is good, Dragonfly works properly. If there is a huge back light making the rest of the scene looking obscure, then the position won’t be available because the features won’t be clearly visible. Think about a human being: if the environment is too dark to see for a human, Dragonfly won’t work. Likewise, if it’s too bright.