Giftbox Generator
You can get the free HDAs on gumroad: https://dctech.gumroad.com/
or ArtStation: https://www.artstation.com/undertow/store
They work in Unreal, Unity, Houdini, Maya and Max
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This demo is also using parts of the Frost Realm pack: https://www.unrealengine.com/marketplace/en-US/product/frost-realm
User guide & demo, split up for ArtStation's video limit
Simple lighting mode
Unity demo
The demo material showing some of the vert color uses in Unreal