Chapter 7
Changing model positions in the HUD camera
It will use the projection matrix of its parent camera (or main camera) when there is no preset one. A model filled the entire screen means that you can just wrap it up with a truncated pyramid (perspective) or cube (orthographic). An upside down effect can be implemented using:
setProjectionMatrixAsFrustum( left, right, top, bottom, near, far ); // Swapped top and bottom
To transform a specified part of 3D scenes into 2D images, you have to carefully set the view frustum. The following website may help in some ways: http://www.songho.ca/opengl/gl_projectionmatrix.html.
Another way to display the same scene in different views
The following example code segments will show the same scene in two cameras: ...
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