You need to set the render layer using RenderTypeLookup#setRenderLayer within your FMLClientSetupEvent to make blocks transparent.   It takes in two parameters: the block and the RenderType. The RenderTypes are as follows: Solid - field_228615_R_ Cutout Mipped - field_228616_S_ Cutout - field_228617_T_ Translucent - field_228618_U_ Translucent (No Crumbling) - field_228619_V_ Leash - field_228620_W_ Water Mask - field_228621_X_ Glint
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