Potentially. You could load effects clips in a layer. Adding the crop effect to those clips you could have these effects only impact parts of your composition.
What is it that you are trying to do? There may be a much easier way to accomplish your end goal.
Well I will manage an evening event for kids in my site garden. I am thinking to use wooden pergola's part as scene for mapping effect on them but I have only one projector (though I can rent 2 or 3 for the event).
I just want to know possibility to use one projector in the limit of 200 x 200 (or larger) cm as stage for different FXs.
As an example I mean;
Scene 1 : Minions movie (just a part of movie with no sound)
Scene 2: Shining star and sky effect
Scene 3 : Ice Age movie (just a part of movie with no sound)
I think with this wide and stuff you can be happy with just one prejector and mapped the 3 areas as simple slices and 3 different layers assigned to the 3 slices...
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Well I was out of city and saw your post on my phone and read some topics on the link you shared. It may seem simple though I could not manage to set up virtual slices inside a total screen area. Can you advice a simple video tutorial which place different two scene by using your advice method then i can apply to 3 or 4 furthermore.