Simple Facing Camera Script

[dcancer37]

I attempt build demo example, begining since a clear project, with exactly same scene of collection "InteractionEngine", called Hand UI, but is not run properly and list NullReferenceException
Every time that the scene is running, listing the same Error:

NullReferenceException: Object reference not set to an instance of an object
Leap.Unity.Examples.SimpleFacingCameraCallbacks.GetIsFacingCamera (UnityEngine.Transform facingTransform, UnityEngine.Camera camera, Single minAllowedDotProduct) (at Assets/LeapMotion/Modules/InteractionEngine/Examples/Common Example Assets/Scripts/SimpleFacingCameraCallbacks.cs:58)
Leap.Unity.Examples.SimpleFacingCameraCallbacks.initialize () (at Assets/LeapMotion/Modules/InteractionEngine/Examples/Common Example Assets/Scripts/SimpleFacingCameraCallbacks.cs:35)
Leap.Unity.Examples.SimpleFacingCameraCallbacks.Start () (at Assets/LeapMotion/Modules/InteractionEngine/Examples/Common Example Assets/Scripts/SimpleFacingCameraCallbacks.cs:29)

I do not understand what is the reason for this error....
Anybody have any idea?

I will be grateful for your suggestions.

[AlexColgan]

Please share which versions you are using for the following:

• Unity
• Leap Motion Orion SDK
• Leap Motion Core Assets
• Leap Motion Interaction Engine

Are other scenes running properly?

[dcancer37]

Thanks Alex for your fast response.
The strange thing about this is that the example works correctly if the scene Hand UI is runned in Unity from the Leap package motion example from Modules -> InteractionEngine -> Examples -> 4.Hand UI- -> Hand UI
However, when I replicate the example, in a new project, without any other additional scene, only for learning purpose, with the same tree structure, the same GameObjects names, same labels, same etc ... always throws NullException pointing to item "Palm UI Pivot Anchor".

I had attempt insert it in my project and result is the same.
Relevant data:

Unity 2018.2.1f1
Leap_Motion_Core_Assets_%204.4.0
Leap Motion Orion SDK: Leap_Motion_Setup_4.0.0+52173.exe (from Leap Motion page)
All installed Assets from LM Developer Page:
Core 4.0.0
Hands Module (2.1.4)
Leap Motion Interaction Engine (1.2.0).

Newly, Thanks for your help.

[nbenson]

NullReferenceException: Object reference not set to an instance of an object
Leap.Unity.Examples.SimpleFacingCameraCallbacks.GetIsFacingCamera (UnityEngine.Transform facingTransform, UnityEngine.Camera camera, Single minAllowedDotProduct) (at Assets/LeapMotion/Modules/InteractionEngine/Examples/Common Example Assets/Scripts/SimpleFacingCameraCallbacks.cs:58)

Hmm. This null reference error means one of your references is not set. I would expect that you're missing something like a MainCamera tag or one (or more) of your inspector references is missing.

If there's no obvious reference missing in the inspector, you could open the SimpleFacingCameraCallbacks script and identify which variable is null (by printing the values of each variable) to find out more.

[dcancer37]

Good night:

Finally find the "small" but important error that causes Error NullReference to appear in the
CSharp Script "SimpleFacingCameraCallbacks.cs"
I had a beginner error and I forgot to tag the main camera with the corresponding "MainCamera" tag.
I already labeled it and it worked perfectly.
Thank you very much to the support team for your great support.
Daniel Cancer.

[dcancer37]

Hi! I had the same problem in the beggining. Don´t worry it is easy.

Check in your application in your Main Camera that you select "MainCamera" in the tag field.
Good luck!