Psychtoolbox>PsychCV.{mex*} subfunction

[glProjectionMatrix, camCalib, tagSize, minD, maxD] = PsychCV(‘April3DSettings’ [, camCalib][, tagSize][, minD][, maxD]);

Return current 3D marker pose reconstruction and 3D rendering parameters,
optionally change them.
For 6-DoF 3D marker tag pose computation, and for return of OpenGL compliant
rendering matrices, information about the physical size of april tag markers,
OpenGL near and far clipping planes, andthe intrinsic optical parameters of the
camera that captures the marker images are needed.
These parameters can be changed anytime with this subfunction. Following
settings are available:
‘camCalib’ Intrinsic camera parameters vector: [cx, cy, fx, fy]. (cx,cy) is
sensor center in pixels, (fx,fy) is focal length in pixels.
‘tagSize’ Size of an April tag in meters, ie. length of one side of the square
tag.
‘minD’ Near clipping distance for OpenGL frustum computation - Affects
‘glProjectionMatrix’ matrix only.
‘maxD’ Far clipping distance for OpenGL frustum computation - Affects
‘glProjectionMatrix’ matrix only.

The optionally returned ‘glProjectionMatrix’, based on these parameters, can be
used as OpenGL GL_PROJECTION_MATRIX to render 3D objects superimposed and
aligned with the markers in the video input image from the camera, for
debugging, diagnostics, or AR / mixed reality applications.

###See also: AprilDetectMarkers