Headlight is not disabled

[Samuli]

Thanks for your answer. There are no other real time lights added in the script. The osg export settings of the model were probably wrong. There were lights in the scene of the model file and they were surely exported, which might have caused the problem. Also the 'turn off lighting' option wasn't checked. How do you disable lighting (else than the headlight) of a model through the script, if there are not any lights added via script ?