show at and hide at must be matched?

[Valiowk]

There are a few ATL effects I would like to use to show images. For instance:

Show effect 1:

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show xxx:
    alpha 0.0
    linear 0.5 alpha 0.5

Show effect 2:

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show xxx:
    alpha 0.0
    pause 0.5
    linear 0.5 alpha 0.5

On the other hand, when I hide images, I almost always want to use the same effect:

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show xxx:
    linear 0.5 alpha 0.0

I'm trying to define these ATL effects using a transform statement so that I can supply them as part of a clause later on, for example:

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transform dis:
    on show:
        alpha 0.0
        linear 0.5 alpha 0.5
    on hide:
        linear 0.5 alpha 0.0

transform diss:
    on show:
        alpha 0.0
        pause 0.5
        linear 0.5 alpha 0.5

My experimentation seems to indicate that writing

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show xxx at diss # might add other ATL commands beside diss

...

hide xxx at dis

...

show xxx at dis # might add other ATL commands beside dis

is bad (ATL effect not working properly for hide); I have to write a similar "on hide" line for "transform diss" and make sure that the show at and hide at commands are matched (both "at dis" or both "at diss") in order to achieve the intended effect.

This seems terribly inconvenient: 1) I have to keep track of which transform I used to show an image even though the hide effect is always the same; and 2) if I decide to insert some ATL effects on the image in between, it seems that hide at the matching command doesn't even work properly then. Is there a way to get around this problem?

[philat]

Show at a dissolve out transform and hide at a later point. Hide just doesn't play very well with ATL sometimes.

[Valiowk]

Show at a dissolve out transform and hide at a later point. Hide just doesn't play very well with ATL sometimes.

I was afraid that would be the case. Thanks for confirming so that I don't spend ages trying to find a clean solution to a problem that just doesn't have one.