I have a problem with my blocks, I can see the cave. I think it's because the game detects my blocks as opaque blocks. I have read a tutorial and a post: http://greyminecraftcoder.blogspot.com/2013/07/rendering-transparent-blocks.html   here is the class code that instantiates the blocks: package fr.chtibizoux.woodcraft.init.blocks; import fr.chtibizoux.woodcraft.init.ModBlocks; import net.minecraft.block.Block; import net.minecraft.item.BlockItem; import net.minecraft.