Need ideas how to implement ability to swim.

[naempir...@gmail.com]

Hi, maybe someone can give me some ideas, how can be implemented swimming with detour. Basically i have two layers of geometry - upper is water, lower is ground. and some objects between them. 

The only way, that i have in my head now - is to generate additional layers between water and ground and connect them with offmesh connections, but maybe there is better alternatives?

Thanks for answers and ideas!

[Paul S]

I have been thinking about that a lot actually.  I want that in my MMORPG and I'm hoping for some nice suggestions too.  I have mobs that can walk on the ground, of course, and I also have ones that can walk on the water surface (like water elementals) but I have not yet added fish, sharks, sea creatures, etc, because I've not been able to come up with a solution I'm happy with yet.

All I've come up with so far is to set any triangles that are below a water plane to a different area and basically have the water mob navigate on the terrain below the water BUT keep track of an elevation between the terrain and the water surface.  So, if a shark is attacking a player, for example, he navigates to the player's XZ on the ocean floor but the server will also have the shark rise or sink to the player's Y position as it moves.  If it's random movement within the body of water, you could just pick a random target Y location.  You don't have to worry about it crawling on islands because their triangles would be set to the normal ground area.

There are a couple issues with this approach, hence, why I haven't implemented it myself yet.  This means that the ocean floor/lake floor/river floor can't be jagged or steep.  Even though the mob is swimming above it, the floor actually has to be navigable.  The other issue is a minor one.  There is more complexity in handling vertical movement.  Think about Y movement only or an XZ change that is small but a large Y difference causing the mob to rise or fall too quickly, unless you code to handle those situations.

Paul

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[PaulS]

Of course, my idea (above) also assumes you have normal terrains that have no overhangs and stuff like that.  The mob would also be able to travel right through a pier unless you put enough pillars below it so that nothing can get a path on the ground going right through the pier because we have to remember, detour thinks the creature is crawling on the ground instead of being at its actual elevation.