Hello,
I am using Unity to test out Zapworks and its awesome! One thing I am trying to do is be able to trigger an event before the object gets hidden when it loses the target? What script/code fires this off so I can trigger a fade-out before it disappears?
Thanks,
jrDev
Hey again,
I solved this by copying the code used in the Z.cs file from the static class called PipelineCameraPoseWithOrigin and modified it to this:
public static bool WillTargetHideBegin(IntPtr o, Matrix4x4 pose, float prevPos) {
bool hideWillBegin = false;
float[] arg_pose = new float[16];
for (int i = 0; i < 4; i++)
for (int k = 0; k < 4; k++)
arg_pose[i * 4 + k] = pose[k, i];
IntPtr ret = zappar_pipeline_camera_pose_with_origin(o, arg_pose);
float[] retFloats = new float[16];
Marshal.Copy(ret, retFloats, 0, 16);
Matrix4x4 retMatrix = new Matrix4x4();
for (int i = 0; i < 4; i++)
for (int k = 0; k < 4; k++)
retMatrix[k, i] = retFloats[i * 4 + k];
float posX = float.Parse(retMatrix[2].ToString());
//Don't check if the position hasn't changed as to not overdo checks
if(posX != prevPos){
//If X position is 0 then the object is not on screen; thus the object is going to be hidden
if(posX == 0){
hideWillBegin = true;
}
}
return hideWillBegin;
}
Then I went ahead and made an edited setup with the ZapparCamera.cs file which replaces the UpdatePose class:
void UpdatePose()
{
if (anchorOrigin == null)
{
if (cameraAttitudeFromGyro)
m_cameraPose = Z.PipelineCameraPoseWithAttitude(m_pipeline, useFrontFacingCamera);
else
m_cameraPose = Z.PipelineCameraPoseDefault(m_pipeline);
}
else
{
//Did we turn on delay usage?
if(useDelayHide){
Matrix4x4 anchorPose = anchorOrigin.AnchorPoseCameraRelative();
//Reference the previous position
float posX = float.Parse(m_cameraPose[2].ToString());
if(WillTargetHideBegin(m_pipeline, anchorPose, posX)){
startDelay = true;
//Trigger the new Before Marker Hidden event
anchorOrigin.gameObject.GetComponent<ZapparImageTrackingTarget>().m_OnWillNotBeSeenEvent.Invoke();
}
//Count till reach time before finally hiding the object
if(startDelay){
delayTimeCount += Time.deltaTime;
if(delayTimeCount > delayTime) {
m_cameraPose = Z.PipelineCameraPoseWithOrigin(m_pipeline, anchorPose);
delayTimeCount = 0f;
startDelay = false;
}
}else{
m_cameraPose = Z.PipelineCameraPoseWithOrigin(m_pipeline, anchorPose);
}
}else{//Otherwise hide objects the default way with no delay
Matrix4x4 anchorPose = anchorOrigin.AnchorPoseCameraRelative();
m_cameraPose = Z.PipelineCameraPoseWithOrigin(m_pipeline, anchorPose);
}
}
Matrix4x4 cameraPoseUnity = Z.ConvertToUnityPose(m_cameraPose);
transform.localPosition = Z.GetPosition(cameraPoseUnity);
transform.localRotation = Z.GetRotation(cameraPoseUnity);
transform.localScale = Z.GetScale(cameraPoseUnity);
}
Now this should allow you to do whatever you want before the object gets hidden using the new event. Make sure to add that event to the ZapperImageTrackingTarget script:
public UnityEvent m_OnWillNotBeSeenEvent;
Thanks,
jrDev
Hi @jrDev - great job!
We love seeing the different ways that users play around with the Universal AR SDK to make it suit their projects/make it their own - it’s super inspiring!
Have a great day,
Francesca 
Yeah!
Had to comment out and test a lot of code to figure out what script controlled the hiding/showing of the object though (which is what I wanted to know) before I could modify the script. Hopefully someone else can find use in this.
Thanks,
rDev