ScriptableRenderPipeline/MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Graphs/ViewDirectionMaterialSlot.cs

using System;
using UnityEditor.Graphing;
using UnityEngine;

namespace UnityEditor.ShaderGraph
{
    [Serializable]
    public class ViewDirectionMaterialSlot : SpaceMaterialSlot, IMayRequireViewDirection
    {
        public ViewDirectionMaterialSlot()
        {}

        public ViewDirectionMaterialSlot(int slotId, string displayName, string shaderOutputName, CoordinateSpace space,
                                         ShaderStage shaderStage = ShaderStage.Dynamic, bool hidden = false)
            : base(slotId, displayName, shaderOutputName, space, shaderStage, hidden)
        {}

        public override string GetDefaultValue(GenerationMode generationMode)
        {
            return space.ToVariableName(InterpolatorType.ViewDirection);
        }

        public NeededCoordinateSpace RequiresViewDirection()
        {
            if (isConnected)
                return NeededCoordinateSpace.None;
            return space.ToNeededCoordinateSpace();
        }
    }
}