Resolved compilation issues related to using UNITY_2022_1_OR_NEWER when UNITY_SPLINES_INSTALLED is required.

Author: rajatg-sidefx

Plugins/HoudiniEngineUnity/Scripts/PublicWrappers/IHEU_InputNode.cs

@@ -114,6 +114,11 @@ public interface IHEU_InputNode
 	/// <summary>Tilemap settings</summary>
 	HEU_InputInterfaceTilemapSettings TilemapSettings { get; }
 
+#if UNITY_2022_1_OR_NEWER
+	/// <summary>Spline settings</summary>
+	HEU_InputInterfaceSplineSettings SplineSettings { get; }
+#endif
+
 	/// <summary>
 	/// Whether or not this is an asset input
 	/// </summary>

Plugins/HoudiniEngineUnity/Scripts/Utility/HEU_InputInterfaceSpline.cs

@@ -24,14 +24,18 @@
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
-#if UNITY_SPLINES_INSTALLED
 
 using System.Collections.Generic;
 using System.Linq;
 using UnityEngine;
+
+#if UNITY_SPLINES_INSTALLED
+
 using UnityEngine.Splines;
 using Unity.Mathematics;
 
+#endif
+
 
 namespace HoudiniEngineUnity
 {
@@ -48,6 +52,7 @@ public class HEU_InputInterfaceSplineSettings
         private float _samplingResolution = 0.5f;
     };
 
+#if UNITY_SPLINES_INSTALLED
     /// <summary>
     /// This class provides functionality for uploading Unity spline data from gameobjects
     /// into Houdini through an input node.
@@ -78,6 +83,11 @@ private HEU_InputInterfaceSpline() : base(priority: DEFAULT_PRIORITY)
 
         public void Initialize(HEU_InputInterfaceSplineSettings settings)
         {
+            if (settings == null)
+            {
+                settings = new HEU_InputInterfaceSplineSettings();
+            }
+
             this.settings = settings;
         }
 
@@ -280,6 +290,6 @@ public bool UploadData(HEU_SessionBase session, HAPI_NodeId inputNodeID, HEU_Inp
             return session.CommitGeo(inputNodeID);
         }
     }
-}   // HoudiniEngineUnity
+#endif
 
-#endif
+}   // HoudiniEngineUnity

Plugins/HoudiniEngineUnity/Scripts/Utility/HEU_InputUtility.cs

@@ -226,7 +226,7 @@ internal static bool CreateInputNodeWithMultiObjects(HEU_SessionBase session, HA
 		    HEU_InputInterfaceTilemap tilemapInterface = inputInterface as HEU_InputInterfaceTilemap;
 		    tilemapInterface.Initialize(inputNode.TilemapSettings);
 		}
-#if UNITY_2022_1_OR_NEWER
+#if UNITY_SPLINES_INSTALLED
 		if (inputInterfaceType == typeof(HEU_InputInterfaceSpline))
 		{
             HEU_InputInterfaceSpline splineInterface = inputInterface as HEU_InputInterfaceSpline;