Making a character crouch or move his hands relies on the model animation set. Look at your unit's animations and see what your unit can do. To do so, in World Editor, just select a unit a look at the left of the screen, in the small window where the unit stands. You can view their animations there. (you may also see animations with some other tools such as War 3 Viewer, Magos Model Editor...)
If you want to use a specific animation (in cinematic or not), remember the animation name, and then use this trigger:
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SomeTrigger
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Actions
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Animation - Play Footman's stand animation
Instead of stand, you may use the name of the animation you want to play: stand alternate, attack, attack slam, death, spell, etc
To darken and lighten the screen, I reckon you must be speaking of fading in and out? If so, use these trigger:
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SomeTrigger
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Actions
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Cinematic - Fade out/in over X seconds using texture Black/White mask and color (Y%, Y%, Y%) with Z% transparency
You may change the X to whatever duration you want, the Ys to modify the filter colour (red, green, blue, from 0 to 255), and Z with the transparency you need (from 0 to 100%)
To darken the screen, use
fade out, to lighten it, use
fade in.
You might want to try out several options and see which suit your needs.
There are tutorials in the Hive in the tutorials section (have a look
here), or in some other websites, you should probably check them out.
As for your last question, I'm not sure what you're refering to, can you be more specific?
)
