This is a follow-on from my "Focal Length Value For An Exact 90 Degree FOV ?" thread here in the Poser forum. The conclusion from that thread was that a dolly cam focal length of exactly 12.7mm produces an exact 90° FOV, accurate down to the individual pixels of a 2000x2000 render.

My next step is to create six separate 2000x2000 cubemap renders (north, east, south, west, up, and down is the way I like to refer to them) that butt together into a vertical cross cubemap. This is going very nicely, except for one thing...

The problem I have now is that parts of the plane I'm using for the ground do not get rendered, but seem to be clipped as per the annotated image below:

I'm using Poser 9 Firefly renderer, Manual Settings - 'Acquire From Auto' halfway between Draft and Final, and then IDL enabled and Irradiance caching and Indirect Light Quality both set to 50.

The groundplane is a single sided square, 4 vertices and 1 face, scaled at 1250%.

I don't think it's anything to do with 'Hither' and 'Yon', since these are only relevant to the preview (I think?)

I don't think it's anything to do with displacement, as I have the same problem with "Use Displacement Maps" UNchecked in Render Settings

Anyone have any ideas?

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The 3Dcheapskate (also available in DAZ and HiveWire3D flavours) occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.