Bug / Crash Cannot make a rope with multiple control points

[uatihb]

Trying to setup a rope with variable thickness done by setting up multiple control points. Works in editor, until it doesn't. Can't really save it. Breaks the whole blueprint.
Obi 6.5.4
Unity 2021.3.22 & 2021.3.31
OS Ubuntu 20.04 & Windows 10

NullReferenceException: Object reference not set to an instance of an object
Unity.Collections.LowLevel.Unsafe.UnsafeUtility.WriteArrayElementWithStride[T] (System.Void* destination, System.Int32 index, System.Int32 stride, T value) (at /home/bokken/build/output/unity/unity/Runtime/Export/Unsafe/UnsafeUtilityPatched.cs:66)
Obi.ObiNativeList`1[T].set_Item (System.Int32 index, T value) (at Assets/ImportedAssets/Obi/Scripts/Common/DataStructures/NativeList/ObiNativeList.cs:64)
Obi.ObiActor.UpdateCollisionMaterials () (at Assets/ImportedAssets/Obi/Scripts/Common/Actors/ObiActor.cs:399)
Obi.ObiRope.SetupRuntimeConstraints () (at Assets/ImportedAssets/Obi/Scripts/RopeAndRod/Actors/ObiRope.cs:208)
Obi.ObiRope.OnValidate () (at Assets/ImportedAssets/Obi/Scripts/RopeAndRod/Actors/ObiRope.cs:178)

NullReferenceException: Object reference not set to an instance of an object
Unity.Collections.LowLevel.Unsafe.UnsafeUtility.WriteArrayElementWithStride[T] (System.Void* destination, System.Int32 index, System.Int32 stride, T value) (at /home/bokken/build/output/unity/unity/Runtime/Export/Unsafe/UnsafeUtilityPatched.cs:66)
Obi.ObiNativeList`1[T].set_Item (System.Int32 index, T value) (at Assets/ImportedAssets/Obi/Scripts/Common/DataStructures/NativeList/ObiNativeList.cs:64)
Obi.ObiActor.UpdateCollisionMaterials () (at Assets/ImportedAssets/Obi/Scripts/Common/Actors/ObiActor.cs:399)
Obi.ObiRope.SetupRuntimeConstraints () (at Assets/ImportedAssets/Obi/Scripts/RopeAndRod/Actors/ObiRope.cs:208)
Obi.ObiRope.OnValidate () (at Assets/ImportedAssets/Obi/Scripts/RopeAndRod/Actors/ObiRope.cs:178)
UnityEditor.SerializedObject:ApplyModifiedProperties(SerializedObject)
Obi.ObiRopeEditor:OnInspectorGUI() (at Assets/ImportedAssets/Obi/Editor/RopeAndRod/ObiRopeEditor.cs:124)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr, Boolean&) (at /home/bokken/build/output/unity/unity/Modules/IMGUI/GUIUtility.cs:189)

NullReferenceException: Object reference not set to an instance of an object
Unity.Collections.LowLevel.Unsafe.UnsafeUtility.ReadArrayElementWithStride[T] (System.Void* source, System.Int32 index, System.Int32 stride) (at /home/bokken/build/output/unity/unity/Runtime/Export/Unsafe/UnsafeUtilityPatched.cs:54)
Obi.ObiNativeList`1[T].get_Item (System.Int32 index) (at Assets/ImportedAssets/Obi/Scripts/Common/DataStructures/NativeList/ObiNativeList.cs:60)
Obi.ObiActor.GetParticlePosition (System.Int32 solverIndex) (at Assets/ImportedAssets/Obi/Scripts/Common/Actors/ObiActor.cs:682)
Obi.ObiPathSmoother.PathFrameFromParticle (Obi.ObiRopeBase actor, Obi.ObiPathFrame& frame, System.Int32 particleIndex, System.Boolean interpolateOrientation) (at Assets/ImportedAssets/Obi/Scripts/RopeAndRod/DataStructures/Path/ObiPathSmoother.cs:125)
Obi.ObiPathSmoother.GenerateSmoothChunks (Obi.ObiRopeBase actor, System.UInt32 smoothingLevels) (at Assets/ImportedAssets/Obi/Scripts/RopeAndRod/DataStructures/Path/ObiPathSmoother.cs:177)
Obi.ObiPathSmoother.Actor_OnInterpolate (Obi.ObiActor actor) (at Assets/ImportedAssets/Obi/Scripts/RopeAndRod/DataStructures/Path/ObiPathSmoother.cs:62)
Obi.ObiActor.Interpolate () (at Assets/ImportedAssets/Obi/Scripts/Common/Actors/ObiActor.cs:1221)
Obi.ObiSolver.Interpolate (System.Single stepTime, System.Single unsimulatedTime) (at Assets/ImportedAssets/Obi/Scripts/Common/Solver/ObiSolver.cs:1670)
Obi.ObiUpdater.Interpolate (System.Single stepDeltaTime, System.Single accumulatedTime) (at Assets/ImportedAssets/Obi/Scripts/Common/Updaters/ObiUpdater.cs:132)
Obi.ObiFixedUpdater.Update () (at Assets/ImportedAssets/Obi/Scripts/Common/Updaters/ObiFixedUpdater.cs:66)

NullReferenceException: Object reference not set to an instance of an object
Obi.ObiRopeBlueprint+<Initialize>d__2.MoveNext () (at Assets/ImportedAssets/Obi/Scripts/RopeAndRod/Blueprints/ObiRopeBlueprint.cs:46)
Obi.ObiActorBlueprint+<Generate>d__59.MoveNext () (at Assets/ImportedAssets/Obi/Scripts/Common/Blueprints/ObiActorBlueprint.cs:282)
Obi.ObiActorBlueprint.GenerateImmediate () (at Assets/ImportedAssets/Obi/Scripts/Common/Blueprints/ObiActorBlueprint.cs:273)
UnityEngine.Events.InvokableCall.Invoke () (at /home/bokken/build/output/unity/unity/Runtime/Export/UnityEvent/UnityEvent.cs:178)
UnityEngine.Events.UnityEvent.Invoke () (at /home/bokken/build/output/unity/unity/Runtime/Export/UnityEvent/UnityEvent/UnityEvent_0.cs:58)
Obi.ObiPath.FlushEvents () (at Assets/ImportedAssets/Obi/Scripts/RopeAndRod/DataStructures/Path/ObiPath.cs:403)
Obi.ObiPathEditor.RemoveControlPointsMode (UnityEngine.Matrix4x4 matrix) (at Assets/ImportedAssets/Obi/Editor/RopeAndRod/ObiPathEditor.cs:195)
Obi.ObiPathEditor.OnToolGUI (UnityEditor.EditorWindow window) (at Assets/ImportedAssets/Obi/Editor/RopeAndRod/ObiPathEditor.cs:125)
UnityEditor.EditorTools.EditorToolManager.OnToolGUI (UnityEditor.EditorWindow window) (at /home/bokken/build/output/unity/unity/Editor/Mono/GUI/Tools/EditorToolManager.cs:454)
UnityEditor.SceneView.DefaultHandles () (at /home/bokken/build/output/unity/unity/Editor/Mono/SceneView/SceneView.cs:3156)
UnityEditor.SceneView.DoOnGUI () (at /home/bokken/build/output/unity/unity/Editor/Mono/SceneView/SceneView.cs:2414)
UnityEditor.SceneView.OnSceneGUI () (at /home/bokken/build/output/unity/unity/Editor/Mono/SceneView/SceneView.cs:2255)
UnityEngine.UIElements.IMGUIContainer.DoOnGUI (UnityEngine.Event evt, UnityEngine.Matrix4x4 parentTransform, UnityEngine.Rect clippingRect, System.Boolean isComputingLayout, UnityEngine.Rect layoutSize, System.Action onGUIHandler, System.Boolean canAffectFocus) (at /home/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/IMGUIContainer.cs:372)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, UnityEngine.Matrix4x4 worldTransform, UnityEngine.Rect clippingRect, System.Action onGUIHandler, System.Boolean canAffectFocus) (at /home/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/IMGUIContainer.cs:693)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, System.Action onGUIHandler, System.Boolean canAffectFocus) (at /home/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/IMGUIContainer.cs:665)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, System.Boolean canAffectFocus) (at /home/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/IMGUIContainer.cs:658)
UnityEngine.UIElements.IMGUIContainer.SendEventToIMGUIRaw (UnityEngine.UIElements.EventBase evt, System.Boolean canAffectFocus, System.Boolean verifyBounds) (at /home/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/IMGUIContainer.cs:618)
UnityEngine.UIElements.IMGUIContainer.SendEventToIMGUI (UnityEngine.UIElements.EventBase evt, System.Boolean canAffectFocus, System.Boolean verifyBounds) (at /home/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/IMGUIContainer.cs:607)
UnityEngine.UIElements.IMGUIContainer.HandleEvent (UnityEngine.UIElements.EventBase evt) (at /home/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/IMGUIContainer.cs:535)
UnityEngine.UIElements.EventDispatchUtilities.PropagateEvent (UnityEngine.UIElements.EventBase evt) (at /home/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/Events/IEventDispatchingStrategy.cs:113)
UnityEngine.UIElements.MouseEventDispatchingStrategy.SendEventToRegularTarget (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.BaseVisualElementPanel panel) (at /home/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/Events/MouseEventDispatchingStrategy.cs:35)
UnityEngine.UIElements.MouseEventDispatchingStrategy.SendEventToTarget (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.BaseVisualElementPanel panel) (at /home/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/Events/MouseEventDispatchingStrategy.cs:26)
UnityEngine.UIElements.MouseEventDispatchingStrategy.DispatchEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel iPanel) (at /home/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/Events/MouseEventDispatchingStrategy.cs:19)
UnityEngine.UIElements.EventDispatcher.ApplyDispatchingStrategies (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, System.Boolean imguiEventIsInitiallyUsed) (at /home/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/EventDispatcher.cs:381)
UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at /home/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/EventDispatcher.cs:344)
UnityEngine.UIElements.EventDispatcher.ProcessEventQueue () (at /home/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/EventDispatcher.cs:306)
UnityEngine.UIElements.EventDispatcher.OpenGate () (at /home/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/EventDispatcher.cs:270)
UnityEngine.UIElements.EventDispatcherGate.Dispose () (at /home/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/EventDispatcher.cs:75)
UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at /home/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/EventDispatcher.cs:372)
UnityEngine.UIElements.EventDispatcher.Dispatch (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, UnityEngine.UIElements.DispatchMode dispatchMode) (at /home/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/EventDispatcher.cs:222)
UnityEngine.UIElements.BaseVisualElementPanel.SendEvent (UnityEngine.UIElements.EventBase e, UnityEngine.UIElements.DispatchMode dispatchMode) (at /home/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/Panel.cs:420)
UnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at /home/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/UIElementsUtility.cs:468)
UnityEngine.UIElements.UIElementsUtility.UnityEngine.UIElements.IUIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& eventHandled) (at /home/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/UIElementsUtility.cs:211)
UnityEngine.UIElements.UIEventRegistration.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at /home/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/UIElementsUtility.cs:74)
UnityEngine.UIElements.UIEventRegistration+<>c.<.cctor>b__1_2 (System.Int32 i, System.IntPtr ptr) (at /home/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/UIElementsUtility.cs:28)
UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& result) (at /home/bokken/build/output/unity/unity/Modules/IMGUI/GUIUtility.cs:189)

[josemendez]

Trying to setup a rope with variable thickness done by setting up multiple control points.

Hi!

I'm unable to reproduce this, tested with Obi 6.5.4 / Unity 2021.3.22 / Windows 10.

Created a new rope blueprint, assigned it to a ObiRope component, entered path edit mode and created multiple new control points. Then adjusted their radius to produce a variable-thickness rope. It's a fairly transited workflow.

Can't really save it.

Do you mean the blueprint? It should be automatically saved after making any changes, but if there’s an exception/error it probably is preventing the changes from being saved.

Works in editor, until it doesn't.

Ok, could you detail the steps that lead to it ceasing to work? I’m afraid your report isn’t very clear to me, all I know so far is that this error happens when manipulating control points somehow, but never ran into something similar myself or had any similar reports in the past. Stress-testing the system by haphazardly adding/editing/removing control points did not take me anywhere, I’ll need some more specific directions.

kind regards,