Skip to main content

Skynet

Ok, so it's not exactly skynet, but I have got my first AI state working, kind of.


The first state is "HOLD" in which case the agent stays in place where they are and shoots at any unit that comes in range. When I started writing this module, I found that the existing method of triggering actions wasn't good enough to allow the AI to choose the best weapon or target. It worked by simply sending a command to the unit to trigger the currently selected action.

If the action is valid, it triggered, if not it didn't.
That's fine for play controlled units, as that's all they need to do. But AI needs to know in advance if the action is valid. The player can get that info from UI feedback, but that wasn't available to the AI player.

There were three problems:

1. The UI feedback duplicated code in the action trigger function. These  two sets of code could get out of phase so that UI feedback was wrong.

2. The action trigger didn't give enough feedback for the AI to make decisions.

3. The action trigger method as monolithic. It contained both validation and triggering code.

So I separated the validation part and the triggering part in to two different methods. The UI could now call the validation part to display feedback (check the top left of the animations here), and the AI can use it to get feedback about its combat options too and make choices about which is the best attack to use, or which is the best target.


Now I feel like I'm in a much better position to move forward with programming the AI.
It's not going to be a richly featured generic AI. Instead the mission editor will allow the level designer to give units AI flags to control their behavior.
An "ATTACK" flag will be given to units which are supposed to be assaulting a "DEFEND" objective. They will move towards the target, trying to make use of cover until they get within range of the objective, or they see a player controlled unit. Then they will engage in combat.

Jobs such as support, supply, repair or air support liaison will be handled by units with special flags.

Once I start writing code for random missions, there will have to be a function to assign these flags automatically. But for the first version of the game, the ALPHA build, missions will be written by hand using the fully featured mission editor I designed earlier.

I've added the ability to add objectives, way points and area triggers, as well as another menu for adding AI flags and special conditions, so that units can start the game with their crew knocked out (ready for salvage) or partly damaged (ready for rescue).


Objectives will be color coded, which corresponds to number indexes 1-8. Units can be given an objective index too. Destroy all units associated with "DEFEND" objective to set that objective to "COMPLETE". Escort all vehicles with linked to an "ESCORT" objective to chalk up another victory. And so on.

You can also see an "L" shaped arrow above the red objective above. This is a trigger index. The red objective will only be activated when the Pink objective is "COMPLETE". This allows objectives to be staged as a sequence. A mission might have multiple waves of enemy reinforcements, or it might involve a scouting phase before friendly reinforcements arrive.

Objectives can have a time limit or time delay, and they can be visible or invisible. Some objectives like "NO AIR SUPPORT" are global, though they could be given a trigger index or a time limit to limit their effect.

Labels:

Comments

Post a Comment

Popular posts from this blog

Advice needed on tilesets...

I need some advice on which is the best way to handle building the dungeon. Right now I'm using prefabs for my dungeon, they have a north south east and west section for each "room": The basic tileset. This has several advantages, and also several disadvantages. Firstly I can have curved rooms, I can have tunnels and other interesting shapes. The tilesets can look quite nice with a little work. On the other hand I can't easily get the navigation data before building the map and once the map has been built I can't make changes to the layout, like having active pit traps or believable secret doors. Although the rooms are interesting, they are quite repetitive, and it takes a lot of effort to make even a few different variations. Also rooms are constrained to one size. A newer version of the tileset with a lot of variant parts for making more interesting rooms. To create a tile set is a real headache too. Planning how to lay out the UVs, trying to cra...
7 comments
Read more

Upstairs / Downstairs.

I've decided to make my prefabs multilevel. Later this should allow me to add pit traps and other great stuff. It also makes it easier to line up stairs so that you can exit them on the same co-ordinates where you entered them. The prefab editor is pretty much finished, it just needs some code for loading up prefabs from a saved dictionary, so that they can be checked or edited. The entries will need to be forwards compatible, so I'll be loading each tile and then translating the indexes to a new array, that way if I add extra indexes or extra info (like traps or puzzles) I'll be able to update existing prefabs to work with the new standard. Click for a video.
6 comments
Read more

Video Diary 8

Things are moving along well, there's been a lot of progress on the action manager side of things. Actions have finally moved to the UI, so you can initiate actions by clicking the appropriate button. I've set up some dummy actions to show what happens visually when actions are taken, but the actual dice rolls and such are yet to be integrated. The UI objects are also being added, though some are non functional or empty at the moment. Click on the image to see this week's development video. Every time I add something big I also add about a dozen small things. Like the selection box visualization. Previously this was using render.drawline, and old fashioned Blender function which can be impossible to see at certain resolutions, or at certain frequencies. I replaced it with a function that adds planes of the right size and scale in the right location. I also made all characters a little bigger. I still need to do some work with vectors and final target locations t...
3 comments
Read more