Fixes vibrant quartz glass using the wrong model.

Fixes matrix frame not having a model (the block is transparent though).
Don't register an item model for the invalid part anymore.
Make variant registration for items more explicit.
This fixes #5

src/main/java/appeng/block/storage/SkyChestRenderingCustomizer.java

@@ -29,7 +29,8 @@ public class SkyChestRenderingCustomizer extends BlockRenderingCustomizer
 
 		// Register a custom non-tesr item model
 		String modelName = getModelFromType();
-		itemRendering.model( new ModelResourceLocation( "appliedenergistics2:" + modelName, "inventory" ) );
+		ModelResourceLocation model = new ModelResourceLocation( "appliedenergistics2:" + modelName, "inventory" );
+		itemRendering.model( model ).variants( model );
 	}
 
 	private String getModelFromType()

src/main/java/appeng/bootstrap/BlockDefinitionBuilder.java

@@ -130,7 +130,8 @@ class BlockDefinitionBuilder implements IBlockBuilder
 			@SideOnly( Side.CLIENT )
 			public void customize( IBlockRendering rendering, IItemRendering itemRendering )
 			{
-				itemRendering.model( new ModelResourceLocation( new ResourceLocation( AppEng.MOD_ID, registryName ), "inventory" ) );
+				ModelResourceLocation model = new ModelResourceLocation( new ResourceLocation( AppEng.MOD_ID, registryName ), "inventory" );
+				itemRendering.model( model ).variants( model );
 			}
 		} );
 

src/main/java/appeng/bootstrap/ItemRendering.java

@@ -2,6 +2,7 @@ package appeng.bootstrap;
 
 
 import java.util.Collection;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
@@ -127,6 +128,16 @@ class ItemRendering implements IItemRendering
 		{
 			factory.addBootstrapComponent( new ItemVariantsComponent( item, resources ) );
 		}
+		else if( !this.itemModels.isEmpty() || itemMeshDefinition != null )
+		{
+			// Adding an empty variant list here will prevent Vanilla from trying to load the default item model in this case
+			factory.addBootstrapComponent( new ItemVariantsComponent( item, Collections.emptyList() ) );
+		}
+		else if( item instanceof ItemBlock )
+		{
+			// The default for block items is to register the block model
+			factory.addBootstrapComponent( new ItemVariantsComponent( item, Collections.emptyList() ) );
+		}
 
 		if( itemColor != null )
 		{

src/main/java/appeng/core/api/definitions/ApiBlocks.java

@@ -420,7 +420,8 @@ public final class ApiBlocks implements IBlocks
 					@SideOnly( Side.CLIENT )
 					public void customize( IBlockRendering rendering, IItemRendering itemRendering )
 					{
-						itemRendering.model( new ModelResourceLocation( new ResourceLocation( AppEng.MOD_ID, registryName ), "facing=east,half=bottom,shape=straight" ) );
+						ModelResourceLocation model = new ModelResourceLocation( new ResourceLocation( AppEng.MOD_ID, registryName ), "facing=east,half=bottom,shape=straight" );
+						itemRendering.model( model );
 					}
 				} )
 				.build();

src/main/java/appeng/items/parts/ItemMultipartRendering.java

@@ -43,10 +43,10 @@ public class ItemMultipartRendering extends ItemRenderingCustomizer
 
 		// Register all item models as variants so they get loaded
 		rendering.variants( Arrays.stream( PartType.values() )
+				.filter( f -> f != PartType.InvalidType )
 				.flatMap( part -> part.getItemModels().stream() )
 				.collect( Collectors.toList() ) );
 
-		// TODO All of this has to go somewhere else! (I.e. when the part is registered)
 		// Register the built-in models for annihilation planes
 		ResourceLocation annihilationPlaneTexture = new ResourceLocation( AppEng.MOD_ID, "items/part/annihilation_plane" );
 		ResourceLocation annihilationPlaneOnTexture = new ResourceLocation( AppEng.MOD_ID, "parts/annihilation_plane_on" );