modelbake.java

private OreBlock dankBlock;

@EventHandler
    public void preinit(FMLPreInitializationEvent event) {
        metals = gson.fromJson(mMetals.getResourceAsJSON("data/wip.json"), Metal[].class);
        MinecraftForge.EVENT_BUS.register(this);
        for (Metal metal : metals) {
            OreBlock oreBlock = new OreBlock(metal);
            dankBlock = oreBlock;
            GameRegistry.registerBlock(oreBlock, oreBlock.getName());
            ModelBakery.registerItemVariants(Item.getItemFromBlock(oreBlock));
        }
    }

    @EventHandler
    public void init(FMLInitializationEvent event) {
        ItemModelMesher itemModelMesher = Minecraft.getMinecraft().getRenderItem().getItemModelMesher();
        itemModelMesher.register(Item.getItemFromBlock(dankBlock), 0, new ModelResourceLocation(MODID + ":" + dankBlock.getName(), "normal"));
    }

    @SubscribeEvent(priority = EventPriority.LOWEST)
    public void bakeModels(ModelBakeEvent event) {
        try {
            IRetexturableModel model = (IRetexturableModel) ModelLoaderRegistry.getModel(new ResourceLocation("minecraft:block/cube_all"));

            IModel retexture = model.retexture(ImmutableMap.of("all", "mmetals:blocks/copper_ore"));
            TextureMap textures = Minecraft.getMinecraft().getTextureMapBlocks();
            IFlexibleBakedModel bakedModel = retexture.bake(retexture.getDefaultState(), Attributes.DEFAULT_BAKED_FORMAT, (location) -> textures.getAtlasSprite(location.toString()));
            event.modelRegistry.putObject(new ModelResourceLocation("mmetals:copper_ore#normal"), bakedModel);
            event.modelRegistry.putObject(new ModelResourceLocation("mmetals:copper_ore#inventory"), bakedModel);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }