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like alpha-blending: alpha-blending only works if the semi-transparent
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#X text 596 291 this turns out to be a problem in dynamic scenes (eg:
with moving objects/viewpoint):: if a semi-transparent object used
to be "in front" of another semi-transparent object \, but suddenly
becomes "behind" \, the rendering order has to be changed. do this
\, by giving the [gemhead] a "set" message;
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