@SideOnly(Side.CLIENT)
@SubscribeEvent
public void modelBakeEvent(ModelBakeEvent event) {
event.getModelManager().getBlockModelShapes().registerBlockWithStateMapper(ModBlocks.(твой блок), (new StateMap.Builder()).withName(IProperty.(твой параметр)).withSuffix("_какой-то суфикс").build());
event.getModelLoader().setupModelRegistry();
}