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How to Convert pixels in SDUs

How to Convert pixels in SDUs
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Hi I am using phonegap wikitude sdk.I want to display the video based on the different device screen resolution.

How to convert the pixel in SDUs to use in VideoDrawable.

Thanks in Advance.

If the goal is to have a physical size that is similar across all screens, you can set the AR.scene.globalScale property to -1 which enables auto scaling. We have introduced this with SDK version 3.3.

There is no easy way to calculate how many pixel an object with a certain size in SDUs will use. This depends on the viewing angle of the camera, the distance of the object, screen resolution, ... .

If the above does not help you to reach your goal, just let us know.
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