I just made a json model of a 2x3x3 block, i tought you could do this becouse making it 1.5 blocks tall worked, i get this error:

 

Spoiler

[21:26:53] [Client thread/ERROR] [FML]: Could not load vanilla model parent 'walkingdeadmod:block/airdrop' for 'net.minecraft.client.renderer.block.model.ModelBlock@7acff702
net.minecraftforge.client.model.ModelLoaderRegistry$LoaderException: Exception loading model walkingdeadmod:block/airdrop with loader VanillaLoader.INSTANCE, skipping
    at net.minecraftforge.client.model.ModelLoaderRegistry.getModel(ModelLoaderRegistry.java:153) ~[ModelLoaderRegistry.class:?]
    at net.minecraftforge.client.model.ModelLoaderRegistry.getModelOrLogError(ModelLoaderRegistry.java:203) [ModelLoaderRegistry.class:?]
    at net.minecraftforge.client.model.ModelLoader$VanillaModelWrapper.getTextures(ModelLoader.java:498) [ModelLoader$VanillaModelWrapper.class:?]
    at net.minecraftforge.client.model.ModelLoaderRegistry.getModel(ModelLoaderRegistry.java:163) [ModelLoaderRegistry.class:?]
    at net.minecraftforge.client.model.ModelLoader.loadItemModels(ModelLoader.java:336) [ModelLoader.class:?]
    at net.minecraft.client.renderer.block.model.ModelBakery.loadVariantItemModels(ModelBakery.java:175) [ModelBakery.class:?]
    at net.minecraftforge.client.model.ModelLoader.setupModelRegistry(ModelLoader.java:156) [ModelLoader.class:?]
    at net.minecraft.client.renderer.block.model.ModelManager.onResourceManagerReload(ModelManager.java:28) [ModelManager.class:?]
    at net.minecraft.client.resources.SimpleReloadableResourceManager.notifyReloadListeners(SimpleReloadableResourceManager.java:132) [SimpleReloadableResourceManager.class:?]
    at net.minecraft.client.resources.SimpleReloadableResourceManager.reloadResources(SimpleReloadableResourceManager.java:113) [SimpleReloadableResourceManager.class:?]
    at net.minecraft.client.Minecraft.refreshResources(Minecraft.java:800) [Minecraft.class:?]
    at net.minecraftforge.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:366) [FMLClientHandler.class:?]
    at net.minecraft.client.Minecraft.init(Minecraft.java:562) [Minecraft.class:?]
    at net.minecraft.client.Minecraft.run(Minecraft.java:387) [Minecraft.class:?]
    at net.minecraft.client.main.Main.main(Main.java:118) [Main.class:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_121]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_121]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_121]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_121]
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.12.jar:?]
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_121]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_121]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_121]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_121]
    at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:97) [start/:?]
    at GradleStart.main(GradleStart.java:26) [start/:?]
Caused by: com.google.gson.JsonParseException: 'to' specifier exceeds the allowed boundaries: Vector3f[36.0, 2.0, 32.0]
    at net.minecraft.client.renderer.block.model.BlockPart$Deserializer.parsePositionTo(BlockPart.java:192) ~[BlockPart$Deserializer.class:?]
    at net.minecraft.client.renderer.block.model.BlockPart$Deserializer.deserialize(BlockPart.java:77) ~[BlockPart$Deserializer.class:?]
    at net.minecraft.client.renderer.block.model.BlockPart$Deserializer.deserialize(BlockPart.java:70) ~[BlockPart$Deserializer.class:?]
    at com.google.gson.TreeTypeAdapter.read(TreeTypeAdapter.java:58) ~[TreeTypeAdapter.class:?]
    at com.google.gson.Gson.fromJson(Gson.java:803) ~[Gson.class:?]
    at com.google.gson.Gson.fromJson(Gson.java:868) ~[Gson.class:?]
    at com.google.gson.Gson$1.deserialize(Gson.java:126) ~[Gson$1.class:?]
    at net.minecraft.client.renderer.block.model.ModelBlock$Deserializer.getModelElements(ModelBlock.java:315) ~[ModelBlock$Deserializer.class:?]
    at net.minecraft.client.renderer.block.model.ModelBlock$Deserializer.deserialize(ModelBlock.java:248) ~[ModelBlock$Deserializer.class:?]
    at net.minecraft.client.renderer.block.model.ModelBlock$Deserializer.deserialize(ModelBlock.java:242) ~[ModelBlock$Deserializer.class:?]
    at com.google.gson.TreeTypeAdapter.read(TreeTypeAdapter.java:58) ~[TreeTypeAdapter.class:?]
    at net.minecraft.util.JsonUtils.gsonDeserialize(JsonUtils.java:453) ~[JsonUtils.class:?]
    at net.minecraft.client.renderer.block.model.ModelBlock.deserialize(ModelBlock.java:51) ~[ModelBlock.class:?]
    at net.minecraft.client.renderer.block.model.ModelBakery.loadModel(ModelBakery.java:338) ~[ModelBakery.class:?]
    at net.minecraftforge.client.model.ModelLoader.access$1600(ModelLoader.java:126) ~[ModelLoader.class:?]
    at net.minecraftforge.client.model.ModelLoader$VanillaLoader.loadModel(ModelLoader.java:937) ~[ModelLoader$VanillaLoader.class:?]
    at net.minecraftforge.client.model.ModelLoaderRegistry.getModel(ModelLoaderRegistry.java:149) ~[ModelLoaderRegistry.class:?]

 

 

i know that it errors becouse the model is to big, is there a way to make it work with a bigger model?

package com.walkingdead.walkingdeadmod.blocks.lootblocks;

import java.util.ArrayList;
import java.util.List;

import com.walkingdead.walkingdeadmod.WalkingDeadMod;
import com.walkingdead.walkingdeadmod.weapons.ModTools;

import net.minecraft.block.Block;
import net.minecraft.block.SoundType;
import net.minecraft.block.material.Material;
import net.minecraft.block.state.IBlockState;
import net.minecraft.item.ItemStack;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.IBlockAccess;

public class Airdrop extends Block {
	
	
    public Airdrop(Material material, String name) {
        super(material);
        this.setUnlocalizedName(name);
        this.setCreativeTab(WalkingDeadMod.WalkingDead);
        this.setHardness(10F);
        this.setResistance(1000F);
        this.setSoundType(SoundType.GROUND);
        this.setBlockUnbreakable();
    }


    
    public boolean isFullCube(IBlockState state)
    {
        return false;
    }


    public boolean isOpaqueCube(IBlockState state)
    {
        return false;
    }
}

 modclass

JSON models with sizes that are bigger than 1 cube (16x16x16) already behave strange enough with incorrect UVs and bounding box issues. Solution: use custom IBakedModel(s)/make your block consist of multiple 1x1x1 'parts'

Here is a good example of the 'weirdness' I am talking about.

 

If your block has a collision bounds greater than 1x1x1 you're in trouble there too: it won't work either.  Getting fences to work properly was a problem Mojang took several versions to get right.

57 minutes ago, Draco18s said:

If your block has a collision bounds greater than 1x1x1 you're in trouble there too: it won't work either.  Getting fences to work properly was a problem Mojang took several versions to get right.

What kind of trouble?

Basically, you'll collide from some directions and not others and general wonkiness.  The only, the only, direction it is safe to extend a collision box outside the 1x1x1 cube is +Y and even then only an extra half-block.

See how doors work.