In this section, we have listed the issues you may encounter during your application’s development and ways you can work around them.

Canvas objects rendered black in Game view

Issue description:

While building your scene using Canvas, you may encounter the following issue: your objects render correctly in the Scene view, whereas in the Game view they are totally black. This is a known bug of the Unity Editor when using custom shaders on Screen Space - Overlay Canvases objects.

Here are some threads on it:

• https://answers.unity.com/questions/1618238/ui-image-with-material-works-in-scene-mode-but-bla.html?childToView=1642248#comment-1642248
• https://answers.unity.com/questions/1220236/ui-image-dsiplayed-as-black-when-using-screen-spac.html

Workaround:

Set the Canvas’ Render Mode to Screen Space - Camera and reference the right Camera in the field Render Camera, or set the Render Mode to World Space.

NeuroTags stimulation texture badly rendered on canvas

Issue description:

While building your scene using Canvas, you may encounter the following issue: your canvas objects using NextMind shaders are rendering the stimulation texture abnormally.

Workaround:

This is due to the shaders that aren’t properly handling the stimulation texture’s triplanar projection on default canvas. There are two ways to work around this issue :

• Set the Projection property of the object’s material to Standard or Screen Coordinates.
• Add Normal to the Canvas Additional Shader Channels property.

Focus simulation & example scenes are not working while using Unity’s new Input System

Issue description:

While using Unity’s new input system, you may notice that Focus Simulation is not working: even if the checkbox is checked on the NeuroManager, clicking on a NeuroTag will not allow you to interact with it.

The issue is also noticeable in SDK’s example scenes: you are not able to navigate through the steps.

Workaround:

The focus simulation is currently using Unity’s old input system by getting mouse clicks from Input.GetMouseButton. If you need this feature, your only option is to set the Active Input Handling to Both in the player settings:

Regarding the issue happening within SDK’s example scenes, you have 2 options:

• Apply the Both value on Active Input Handling in the player settings
• Follow this guide to modify the scripts of the SDK (it will be done in further releases) and apply the update proposed by Unity on the EventsSystem’s Standalone Input Module of the Hub scene :

Computer is heating and its fan is running at full speed when entering play mode

Issue description:

When entering play mode inside a scene containing a NeuroManager, you may hear the fan turning at full speed until you press Stop. This is often due to the number of FPS reaching too high levels.

Workaround:

You can fix this in two different ways:

• Application.targetFrameRate (https://docs.unity3d.com/ScriptReference/Application-targetFrameRate.html)

  Use this property in the Start function of one your scene’s MonoBehaviours. You should set the lowest value that is acceptable for you. For example, if you choose a frame rate of 90fps, write it like this :

  private void Start()
  {
      Application.targetFrameRate = 90;
  }

• Vertical Synchronisation (https://docs.unity3d.com/Manual/class-QualitySettings.html)

  The vertical synchronisation can be set from Edit>Project Settings>Quality. In the Other section, you have to change the VSync Count property to Every V Blank or Every Second V Blank

  

  The VSync has to be enabled in the Game view as well:

  

Troubleshooting

In this section, we list common blocking situations users can face while developing an application with the NextMind SDK. Then we propose hints about what can cause the issue and how to resolve it.

DllNotFoundException message is displayed

Issue description:

When running the app, the message below is displayed:

Potential fixes:

• This message is mostly displayed when an unsupported architecture is selected in the build settings. Make sure the right platform is selected (https://www.next-mind.com/product/specs/).

  

• It may also be displayed if a SDK’s library is not present in your project. In this case, please download & import the SDK again in your project (at least the Plugins folder).

The NeuroTags are not activated

Issue description:

The NeuroTags in the scene remain inactive after pressing play. You notice at least one of these symptoms:

• NeuroTag’s gizmos remain red in the Scene view and not declared as Active in NextMind Profiler
• The stimulation is not happening (i.e. the stimulation texture is not switched on/off rapidly)

Potential fixes:

• NeuroManager:
  • make sure a NeuroManager is present in your scene
  • make sure a Camera is set on the NeuroManager’s Tracking Camera property (The Camera tagged as Main Camera is used if this property is null).
  • make sure the NeuroManager is declared as Ready in the profiler, or by code using NeuroManager.IsReady() function.
• Visibility from the Tracking Camera:
  • make sure the NeuroTags are inside the Tracking Camera’s FOV.
  • make sure the object is on a layer visible to the camera (check Camera’s Culling Mask property)
• NeuroTag:
  • make sure NeuroTag’ Stimulation renderers property is properly set with renderers which should show the stimulation
  • make sure these renderers have a material using a NextMind shader (may not be needed if you are using a custom stimulation)
  • make sure the Stimulation update type is set to Default if you do not intend on using a custom stimulation

The Simulate Focus property is malfunctioning

Issue description:

When clicking on NeuroTags in Play Mode, nothing happens.

Potential fixes:

• Usage:
  • make sure to hold the mouse button while simulating the focus. NeuroTag’s confidence value is not set to 1 directly. It will be smoothly interpolated from the current confidence value to 1.
• NeuroManager:
  • make sure the Simulate Focus is checked
• NeuroTag:
  • make sure the NeuroTag is active (if not, consult dedicated troubleshooting section)
  • make sure the Stimulation renderer targeted by the NeuroTag has:
    • if it is a Canvas object, Raycast Target property checked, and the Canvas has a Graphic Raycaster component
    • else a Collider or Collider2D