I have no idea how to work on the alpha channel, but I may look into it. I had a workaround for this planned: having an invisible enemy unit attached to the hospital ship, either sailing parallel or spawning in the same group (if this is possible). This would "alert" its sensors, causing the large number of searchlights to stay on. I put together a mission last night where a German hospital ship encountered a British convoy at night, and the hospital ship looked quite spectacular all lit up - at least until the escorts blew her out of the water.
Can anyone reccomend a tutorial for working with Alpha channels? I think I'd rather do it that way than with the complicated scheme above.
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