assets\avp\blockstates\unidirt.json

{
    "forge_marker": 1,
    "variants": {
        "normal": [{ "model": "avp:block/unidirt" }]
    }
}

assets\avp\models\block\unidirt.json

{
    "parent": "block/cube_all",
    "textures": {
        "all": "avp:blocks/unidirt"
    }
}

BlockHandler.java

package org.avp;

import org.avp.block.BlockAmpule;
import org.avp.block.BlockAssembler;
import org.avp.block.BlockBlackGoo;
import org.avp.block.BlockBlastdoor;
import org.avp.block.BlockCryostasisTube;
import org.avp.block.BlockCustomSlab;
import org.avp.block.BlockCustomStairs;
import org.avp.block.BlockGenerator;
import org.avp.block.BlockGunLocker;
import org.avp.block.BlockHiveResin;
import org.avp.block.BlockLightPanel;
import org.avp.block.BlockLocker;
import org.avp.block.BlockMedpod;
import org.avp.block.BlockMist;
import org.avp.block.BlockNegativeTransformer;
import org.avp.block.BlockPortal;
import org.avp.block.BlockPowercell;
import org.avp.block.BlockPowerline;
import org.avp.block.BlockRedstoneEmitter;
import org.avp.block.BlockRedstoneFluxGenerator;
import org.avp.block.BlockRedstoneSensor;
import org.avp.block.BlockReflectiveShape;
import org.avp.block.BlockSatelliteDish;
import org.avp.block.BlockSatelliteModem;
import org.avp.block.BlockSolarPanel;
import org.avp.block.BlockStalagmite;
import org.avp.block.BlockStasisMechanism;
import org.avp.block.BlockSupplyCrate;
import org.avp.block.BlockTempleSpawner;
import org.avp.block.BlockTransformer;
import org.avp.block.BlockTurret;
import org.avp.block.BlockUnidentifiedDirt;
import org.avp.block.BlockUnidentifiedLog;
import org.avp.block.BlockUnidentifiedTreeLeaves;
import org.avp.block.BlockUnidentifiedTreeSapling;
import org.avp.block.BlockUnidentifiedTreeTendon;
import org.avp.block.BlockWall;
import org.avp.block.BlockWorkstation;
import org.avp.block.skulls.BlockSkullEngineer;
import org.avp.block.skulls.BlockSkullSpaceJockey;
import org.avp.block.skulls.BlockSkullXenomorph;
import org.avp.block.skulls.BlockSkullXenomorphWarrior;
import org.avp.block.skulls.BlockSkullYautja;
import org.avp.item.ItemSupplyChute.SupplyChuteType;

import com.arisux.mdx.JsonResourceGenerator;
import com.arisux.mdx.lib.game.Game;
import com.arisux.mdx.lib.game.IInitEvent;
import com.arisux.mdx.lib.game.IPreInitEvent;
import com.arisux.mdx.lib.game.Renderers;
import com.arisux.mdx.lib.world.block.BlockMaterial;
import com.google.common.base.Optional;
import com.google.common.collect.ImmutableMap;

import net.minecraft.block.Block;
import net.minecraft.block.material.Material;
import net.minecraft.block.properties.IProperty;
import net.minecraft.block.state.BlockStateContainer;
import net.minecraft.client.renderer.block.model.ModelResourceLocation;
import net.minecraft.item.Item;
import net.minecraft.item.ItemBlock;
import net.minecraft.util.BlockRenderLayer;
import net.minecraft.util.ResourceLocation;
import net.minecraftforge.client.model.ModelLoader;
import net.minecraftforge.common.property.IUnlistedProperty;
import net.minecraftforge.fml.common.FMLCommonHandler;
import net.minecraftforge.fml.common.event.FMLInitializationEvent;
import net.minecraftforge.fml.common.event.FMLPreInitializationEvent;
import net.minecraftforge.fml.common.registry.GameRegistry;
import net.minecraftforge.fml.relauncher.Side;

public class BlockHandler implements IPreInitEvent
{
    public static BlockHandler instance                   = new BlockHandler();
    
    public Block               unidirt                    = (new BlockUnidentifiedDirt()).setHardness(0.5F).setResistance(2.0F).setLightOpacity(255);

    private void register()
    {
        register(AliensVsPredator.ID, "unidirt", unidirt);
    }

    public Block register(String modid, String identifier, Block block)
    {
        block.setUnlocalizedName(String.format("%s:%s", modid, identifier));
        block.setCreativeTab(AliensVsPredator.tabBlocks());

        GameRegistry.register(block, new ResourceLocation(modid, identifier));
        GameRegistry.register(new ItemBlock(block).setRegistryName(block.getRegistryName()));

        if (FMLCommonHandler.instance().getSide() == Side.CLIENT)
        {
            Item item = Item.getItemFromBlock(block);
            ModelResourceLocation modelResource = new ModelResourceLocation(item.getRegistryName(), "inventory");
            ModelLoader.setCustomModelResourceLocation(item, 0, modelResource);
        }

        return block;
    }

    @Override
    public void pre(FMLPreInitializationEvent event)
    {
        this.register();
    }
}