Black base in envmap rotation function

[MrCorsair3]

Hello, many thanks for amazing work, this code and all project is very helpful. I have small doubt about lines 339 and 340 in generateXML.py file: envBalck = np.zeros([256, 1024, 3], dtype=np.float32 ) env = np.concatenate([env, envBalck], axis=0 ) What exactly means these lines ? I have thesis that black part of environment is equivalent of base (e.g. when sphere is placed on the table this black part is surface of table) Am I right?

Best regards