Block Attributes
textureFileZN
This attribute defines the texture file that the block will use for its z-negative side. Texture files for this attribute go into the textures/blocks directory of your mod.
Examples
// Uses textures/blocks/myBlockZN.png from the mod's directory
textureFileZP[0] = "myBlockZN.png";
// ...
// Uses textures/blocks/wood.png from the minecraft.jar
textureFileZP[15] = "/wood.png";
// Uses mods/SomeMod/blocks/someBlock.png
textureFileZP[0] = "/SomeMod:someBlock.png";
textureFileZP[0] = "myBlockZN.png";
// ...
// Uses textures/blocks/wood.png from the minecraft.jar
textureFileZP[15] = "/wood.png";
// Uses mods/SomeMod/blocks/someBlock.png
textureFileZP[0] = "/SomeMod:someBlock.png";