Will it be possible to use and customize lighting without a main.js file?
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This depends on the requests I have made for SDK V2, waiting for a response from Scirra. In the past requests have takes months to years to get implemented. If they implement the requests, main.js will no longer be needed.
Scirra has said the current SDK will be supported at least for two more years (through C3 SDK V1 LTS), which is what is used with the main.js file.