.. _3 Development Notes:

3	Development Notes 
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3.1	Enable Developer options
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Please check details from this FAQ link on how to enable developer https://sdk.picovr.com/docs/FAQ/chapter_one.html

3.2	Recommended SDK configuration 
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- For Graphics APIs, currently Vulkan is not supported, and OpenGLES2 and OpenGLES3 can be added base on developers’ needs.

For multithreaded rendering, please refer to Unity’s official documentation at https://docs.unity3d.com/ScriptReference/SystemInfo-graphicsMultiThreaded.html.

.. image:: _static/3.1.png

Fig 3.1 Rendering setting

- Detection for V Sync Count is needed. Go to Edit > Project Settings > Quality, check Medium under Levels and make sure that Don’t Sync (required) is selected for V Sync Count under Other:

.. image:: _static/3.2.png

Fig 3.2 Detect V Sync Count

3.3	Unity XR API Support
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This chapter describes updates of support for Unity XR API on version basis.

**Version 1.2.2 added following supports:** 

- Added support for acquiring velocity and angular velocity of head node (XRNode.Head).

- Added support for acquiring velocity, acceleration, and angular velocity of controller nodes (XRNode.LeftHand/XRNode.RightHand).

- Added support for UnityXR controller haptic interface (InputDevice.SendHapticImpulse).

- Added support for configuring eyeTexture value dynamically using XRSettings.eyeTextureResolutionScale.

3.4	Known issue
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- When Unity Stencil Buffer is used in conjunction with Linear Space, there is a black screen problem on Neo 3.

- When using the Scene Quick Preview Tool, if the compiler report error :"BeginLayoutGroup must be called first".This is a known issue and should not affect regular usage.