using UnityEditor.Graphing; using UnityEditor.ShaderGraph.Internal; namespace UnityEditor.ShaderGraph { interface IMayRequireBitangent { NeededCoordinateSpace RequiresBitangent(ShaderStageCapability stageCapability = ShaderStageCapability.All); } static class MayRequireBitangentExtensions { public static NeededCoordinateSpace RequiresBitangent(this MaterialSlot slot) { var mayRequireBitangent = slot as IMayRequireBitangent; return mayRequireBitangent != null ? mayRequireBitangent.RequiresBitangent() : NeededCoordinateSpace.None; } } }