How do you create scenery that rotates or moves?

How do you make textures scroll like on a river or a stream?

What is the best way to create a shader?

Does scenery have to be part of the level's geometry? lets say I take a tree for example. do I weld it directly to the level, so it's part of the level's mesh, or do I just drag and drop it into the ground? Wouldn't that create a "geometry collision?" (which means what?)

Can I make textures partially transparent, (dirty glass) by adding an alpha map?

I want to make a level that has invisible walls on the edges, but no cheap cliffs or mountains. I want to create a view that goes on forever, like the edges of death island. How do I do this?

Is there a maximum amount of polygons? when is the point where the average computer begins to slow down?

How do you add AI to a map?

Is it possible to create scenery that could be damaged? (like making a small tree snap from the force of a warthog?)

Is it possible to modify skies? I want to create a dusk-like scene, with a giant orange sun low
on the horizon, rather than the traditional white speck in the sky with a lens flare.

Can vehicles sustain damage during multiplayer gameplay? I noticed that banshees and ghosts during the campaign recieved damage, and eventually exploded, while the multiplayer versions did not. Is there a reason for this?

Hope you guys can help me, I have a ton of great ideas for a map.

For polys, i think at above 50k tool will start to complain

AI is fun. First you have to have actor varients. Add those into the map the same way you add scenery. Tell us when done.

It is possible to make trees snap in half you just need to make the model of the tree broken and make a model of the tree healthy and use a script

If)unit_get_health)0
change model Or something like that or use Gorilla

PS: I no very good scripter.

30k to high...

Although it may work, older computers and non-portaled maps will have trouble playing it.

Edit: Most of those questions can be answered by reading the HEK tutorial.
Edited by chrisk123999 on Feb 5, 2009 at 09:33 PM

A lot of the stuff you asked can be answered through a couple tutorials.

TheGhost's tutorials index:
http://ghost.halomaps.org/tutorials/

Links to programs, tutorials, articles, downloads, its worth checking out:
http://forum.halomaps.org/index.cfm%3Fpage=topic&topicID=1023

http://hce.halomaps.org/index.cfm?fid=1525

My own:

http://hce.halomaps.org/index.cfm?fid=3656