Hello,

In general, the modelview matrix is the matrix that transforms from local object space to camera space.

In Unity, you can do this in two steps: 

1. Matrix4x4 objectToWorldMatrix = gameObject.transform.localToWorldMatrix;
2. worldToCameraMatrix = Camera.worldToCameraMatrix;
3. You obtain the final "objectToCamera" matrix (ile. the modelview matrix) by multiplying the two matrices

The Vuforia camera can be obtained via DigitalEyewearController.Instance.PrimaryCamera

Thanks,

Vuforia Engine Support

Hello,

Thanks for the reply. Sorry but I forgot to mention that currently I am using a webcam. The DigitalEyeWearARController is used for HoloLens and Stereo cam devices. Is the solution in the answer also applicable to the CameraDevice or is it going to be different then?

Best regards

-Dana Scully

Hello,

The DigitalEyewearController API is general purpose. It works in mono and stereo.

Thanks,

Vuforia Engine Support

Hello,

Thanks for the reply. The modelView matrix obtained from the multiplication appears to be correct. One last question: Which model view is represented? Is it the model in camera coordinate system or is it the camera in model coordinate system? (My world center mode is set to Device, So I assume it should be model in camera). 

Best regards

-Dana Scully

Hello,

The model View matrix represents model to camera, i.e. it transforms a 3d point coordinates from the model reference frame to camera reference frame. A simple matrix inversion provides the opposite transformation.

Thanks,

Vuforia Engine Support