I have been experimenting with ARKit and saw that the 4x4 matrix from the ARCamera().transform property is very lightly documented and was wondering if anyone had any insight into what each column/row in the matrix represented? I was able to gather from the WWDC video that column 3 is for x y and z translations but I wasn't able to find documentation on the rest of the values. Any help figuring this out would be greatly appreciated.
What do the values in the ARCamera transform matrix_identity_float4x4 represent?
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given where the camera is in world coordinates (camera.transform), you may want to then use the identity matrix to access the space just in front (along the z axis) of the camera view (another way is via the camera's projectionMatrix and the hitResult test but that usage demands more complicated matrix maths that still confuse me).
eg
var translation = matrix_identity_float4x4 // this is the magic sauce here translation.columns.3.z = -1.0 let pos = transform! * translation let position = SCNVector3(pos.columns.3.x, pos.columns.3.y, pos.columns.3.z)