[Therion] How can I make bitmaps overlapping in a transparent way ?

[Michael Wasmund]

Hello,
For Fuchslabyrinth cave, we're using primarily morphed bitmaps.

With the default thconfig settings, at areas where bitmaps overlap, one of
them is "half-transparent".
(See attached image)
I played with the "opaque" parameter, but the results are not what we want:
opaque = 100: overlap area shows one of two bitmaps only.
opaque = 0: All bitmaps vanish completely.
opaque = 10: either bitmaps are drawn in extremely light colour, hardly
visible.

What we need is full visibility (100%) of either bitmap, regardless whether
they overlap or not.

Any hints how to achieve this ?

If this is not possible, is there a way to control which bitmap is on top ?

Regards,
Michael
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