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Will the projection matrix change every frame?

March 4, 2015 - 10:22am #1

I see I can use QCAR::Tool::getProjectionGL to get the projection matrix. Should I call it every frame? Or is it OK to call it only once at the beginning of the appliation? In other words, will the projection matrix be change during the running time? What parameters decide this matrix? Are they fixed for a cerntain camera or not?

Will the projection matrix change every frame?

March 17, 2015 - 10:14am #2

For the ARCamera, it's not necessary to get the projection matrix every frame. An instance where the projection matrix changes is if the aspect ratio updates due to a change between portrait and landscape.

 

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