ScriptableRenderPipeline/MaterialGraphProject/Assets/UnityShaderEditor/Runtime/Graphs/AbstractMaterialGraph.cs

using System;
using System.Collections.Generic;
using UnityEngine.Graphing;

namespace UnityEngine.MaterialGraph
{
    [Serializable]
    public abstract class AbstractMaterialGraph : SerializableGraph
    {
        public override void AddNode(INode node)
        {
            if (node is AbstractMaterialNode)
            {
                base.AddNode(node);
            }
            else
            {
                Debug.LogWarningFormat("Trying to add node {0} to Material graph, but it is not a {1}", node, typeof(AbstractMaterialNode));
            }
        }

        public override Dictionary<SerializationHelper.TypeSerializationInfo, SerializationHelper.TypeSerializationInfo> GetLegacyTypeRemapping()
        {
            var result = base.GetLegacyTypeRemapping();
            var viewNode = new SerializationHelper.TypeSerializationInfo
            {
                fullName = "UnityEngine.MaterialGraph.ViewDirectionNode",
                assemblyName = "Assembly-CSharp"
            };
            result[viewNode] = SerializationHelper.GetTypeSerializableAsString(typeof(WorldSpaceViewDirectionNode));

            var normalNode = new SerializationHelper.TypeSerializationInfo
            {
                fullName = "UnityEngine.MaterialGraph.NormalNode",
                assemblyName = "Assembly-CSharp"
            };
            result[normalNode] = SerializationHelper.GetTypeSerializableAsString(typeof(WorldSpaceNormalNode));

            var worldPosNode = new SerializationHelper.TypeSerializationInfo
            {
                fullName = "UnityEngine.MaterialGraph.WorldPosNode",
                assemblyName = "Assembly-CSharp"
            };
            result[worldPosNode] = SerializationHelper.GetTypeSerializableAsString(typeof(WorldSpacePositionNode));


            return result;
        }
    }
}