----- Original Message -----
From: "Alf Peake" <alf### [at] peake42freeservecouk>
[snip]
> Can anyone suggest what I should be looking for?

Just noticed my stats with the base as the *only* isosurface.

Base visible, complete trap OK, most other objects removed:

Ray->Shape Intersection          Tests       Succeeded  Percentage
Isosurface Bound                 15811            7873     49.79
Isosurface                        7703            7653     99.35
Isosurface Cache                  7580               0      0.00

Base missing, most permutations of objects in scene:

Isosurface Bound                 13618            7750     56.91
Isosurface                        7744               0      0.00
Isosurface Cache                  7743            7743    100.00

Alf

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