Paul Bourke wrote:

> Any comments on why the following doesn't work
>     http://local.wasp.uwa.edu.au/~pbourke/tmp/sim/testmodel.zip

According to the docs, the alpha channel is used for *non-filtered*
transparency (i.e. transmit instead of filter), so it wouldn't affect
the light going through it, only how you see objects through it
(except for alpha 255, which casts a shadow).

Furthermore, when I open projectorimage1.tga in Gimp I don't see any
transparency (checkered background shining through). After adding some
test transparency, it seemed indeed that the non-transparent areas cast
a shadow and semi-transparent area let all photons through unfiltered.

Do you actually need alpha to vary across the image? Otherwise, just
use a solid pigment and apply "filter all 1.0" to the image_map.

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