Fixes #2532: Work around bug in Forge lighting pipeline and UnpackedBakedQuad.

src/main/java/appeng/client/render/model/AutoRotatingModel.java

@@ -88,8 +88,23 @@ public class AutoRotatingModel implements IBakedModel
 				builder.setQuadOrientation( null );
 
 			}
-			BakedQuad q = builder.build();
+			BakedQuad unpackedQuad = builder.build();
-			rotated.add( q );
+
+			// Make a copy of it to resolve the vertex data and throw away the unpacked stuff
+			// This also fixes a bug in Forge's UnpackedBakedQuad, which unpacks a byte-based normal like 0,0,-1
+			// to 0,0,-0.99607843. We replace these normals with the proper 0,0,-1 when rotation, which
+			// causes a bug in the AO lighter, if an unpacked quad pipes this value back to it.
+			// Packing it back to the vanilla vertex format will fix this inconsistency because it converts
+			// the normal back to a byte-based format, which then re-applies Forge's own bug when piping it
+			// to the AO lighter, thus fixing our problem.
+			BakedQuad packedQuad = new BakedQuad( unpackedQuad.getVertexData(),
+					quad.getTintIndex(),
+					unpackedQuad.getFace(),
+					quad.getSprite(),
+					quad.shouldApplyDiffuseLighting(),
+					quad.getFormat()
+			);
+			rotated.add( packedQuad );
 		}
 		return rotated;
 	}