How can I get the Minecraft style weapon/tool rendering effect, where I insert a picture and it makes it look 3d? You probably know what I’m talking about, sorry that my explanation is terrible. I’m hoping to save computing power with this method. Loading only 2d pictures but rendering them as 3d objects. Please get back to me with a tutorial, or an idea of how to accomplish this. Thanks!
As far as I know from looking over my son’s shoulder when he plays, that’s not what is happening (2D picture rendered as 3D objects).
What’s actually happening low resolution 2D images are represented in 3D. Each pixel in the 2D icon is represented by a polygon in the 3D world. This isn’t as complicated as you describe it thankfully. 
Just make a polygon for every pixel used for your object.
There are also voxel modelers which is related to the subject. May want to look into that tech to gain additional relevant knowledge.
Check this,
There are couple free scripts for that, maybe 1 in asset store too.
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