I know it's an incrementing suffix for multiple copies of the same prop, but it's the 'sometimes' that puzzles me...

For most props that I load Poser (9) adds an '_1' suffix to the external name of the first one I load, '_2' to the second, etc.

However, I've noticed that for some specific props Poser doesn't add any suffix to the first one, it adds ' 1' to the second, ' 2' to the third, etc.

Examples:

Poser primitive - ball_1, ball_2, ball_3, etc

DAZ H4 Slicer sword - SlicerSword_1, SlicerSword_2, SlicerSword_3, etc

Aery Soul weapons collection - IcyingLight, IcyingLight 1, IcyingLight 2, etc

It doesn't seem to be related to whether the geometry's internal or external.

It doesn't seem to be related to the external name specified in the PP2.

So what's the cause of this ?

(I'm jus' fishin' on various Poser forums...)

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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.