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Hey everyone!
I am late with this challenge but I’ll try to do it anyway as I never did a lootbox vfx so this is a good opportunity!
As I don’t have much free time in October, I will go on something straightforward, nothing fancy in modelization or animation. I like the simplicity of the lootbox animation in League of Legends so I will try to do it my way on Unreal Engine 
I found this great (and free!) model of hextech chest on Sketchfab so this will be a nice start: HextechChest sketchfab - Download Free 3D model by TimothyWasTaken [dc2e4f1] - Sketchfab
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I integrated it this afternoon in Unreal.
I didn’t want to spend time on UVs so I textured it using simple noises in World Align 
I also had to make some changes to the base model because it wasn’t ready for the animation and there wasn’t the cube with more holes so I did it… Painfully but I did it 
The topology is not great but it’s enough for what I want to do
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Animation is almost ready! I decided to make a lot of squash and stretch because… well… it’s just funnier this way and I don’t want to replicate exactly the League of Legends reference. I also thought about doing an opening with the loot going up in the air like in Overwatch!
Can’t wait to start doing the vfx this week end ! 
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Small update, I started adding some effects here and there 
This will need polish but BIG BOOM INCOMING
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Useful tip for those who don’t know:
As I said earlier, I didn’t want to make a proper texturing on the model so I used a World-Aligned Texture to make some variations in the box’s colors. The problem is that this texture stayed world space when the box was moving like in the GIF below
I added a Pre-Skinned Local Position with a Vertex Interpolator as input in the World Position Vector of the World-Aligned Texture to fix this.
And Tadaaa now the box is ready 
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Really cool idea, thank you for sharing! I used same technique inspired by you
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Hey! I tried something fun with the opening of the box: I wanted to make the loot go up in the air like in Overwatch and I was like “Oh, why go in the air when you can go TO SPACE!”
So I made this and it was pretty fun to do! I don’t know exactly what I’m going to do now that the loot is up there, maybe a burst like in Genshin Impact to show if the loot is rare, epic or legendary and then the loot goes back on the ground. Actually, I don’t really know so don’t hesitate if you have any idea I would be glad to hear it haha! Maybe I can do something with the constellations too, that would be nice 
Of course, all the trail is WIP, I think I will make it look a bit like the one in the Star Guardian ost video. That would be a nice reference to the League of Legends universe
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Looking nice! I really like the idea, and it reminds me of “Your name” vibe.
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