The original tree was made by TyroSmith and uploaded here under the CC-0 License. (https://www.blendswap.com/blend/13699)
I modified it somewhat and made a christmas tree out of it. The balls and lights are placed on the tree with particle systems.(One for each ball color and one for the lights.) That let's you easily adjust the amount of balls and lights on the tree.
Thank you for this fabulous realistic tree, it looks better than my christmas tree...
Its way too big. My game engine stopped working for like 20 minutes to get your idiotic tree to work. Please stop building things if you can't make it efficiently.
I'm sorry the model didn't work for you. I can understand that it is way to big for a game engine. Though I don't create models to work in real time render engines. They are made to work with engines like Cycles.
This guy has given you something for free. The words you are looking for are "thank you". It's for cycles, try it there.
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Thank you! hope u have a great day~