How to set static variable and instantiate only one prefab for the AR Core demo

Question

I'm trying to modify the demo scene in the Unity AR Core SDK and I've created a static bool variable isCreated to check if the Andy prefab is created.

In the following check

if (Session.Raycast(m_firstPersonCamera.ScreenPointToRay(touch.position), raycastFilter, outHit))

I've set the variable to be true and then put another check here

if (Input.touchCount < 1 || (touch = Input.GetTouch (0)).phase != TouchPhase.Began || isCreated) {
    return;
}

But for some reason, the variable is never gets set to true. I've also noticed this error in the logs, and can't help but wonder if it somehow prevents it from getting set.

08-29 14:11:40.564 13392-13407/? E/Unity: OPENGL NATIVE PLUG-IN ERROR: GL_INVALID_ENUM: enum argument out of range
(Filename: ./Runtime/GfxDevice/opengles/GfxDeviceGLES.cpp Line: 368)

Please help.

Answer 1

I don't know how badly you want your boolean to static, but I achieved the same result by doing something similar:

bool m_placed = false; // under the color array

Then just like you, I check for it here:

if (Session.Raycast(m_firstPersonCamera.ScreenPointToRay(touch.position), raycastFilter, out hit) && !m_placed) {
    ...
    m_placed = true; // At the very end of this block
}

This works perfectly for me. I did not have add anything to

if (Session.Raycast(m_firstPersonCamera.ScreenPointToRay(touch.position), raycastFilter, outHit))

The OpenGL error is a common issue that has already been raised. It should not affect this.

https://github.com/google-ar/arcore-unity-sdk/issues/3