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* 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 or something else.
*soon only to be available in two flavours -  DAZ and Renderosity