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Save or not save ... and what to save ...

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Hello, I'm looking for an insight on a general problem. If you have some 'world' in a game where the player moves through (eg. some 3-d level) what is the usual way of saving the state of the user? One way would be saving the complete world - but these would be possibly fairly too large. Another would be to have a collection of 'entities' (dynamic objects) which are needed to be saved and only walking through this list and saving them. But, is that the usual way to save everything that has changed in a level from the time the player has set his foot in it? E.g. also these things like the splatter I can do on the walls with the weapon? What is with animations that run at the time of the save operation (think NPC operations, doors, etc.) Curious Alex

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Hi

Dunno if it will ansqer your question but here's how a give parameters to *any* object in my engine.

<WindowModel name="quit">
<Property name="absolute" value="1" />
<Property name="position" value="0, 580" />
<Property name="size" value="800, 20" />
<Property name="bgcolor" value="0, 0, 0, 0" />
<Property name="text" value="Press 'Esc' to exit the engine." />
<Property name="textcolor" value="1, 1, 1, 1" />
<Property name="align" value="center" />
<Property name="font" value="verdana12" />
</WindowModel>

<Entity name="box" type="box">
<Property name="position" value="10.0 , 0.0 , 0.0" />
<Property_ name="rotation" value="0.0 , 90.0 , 45.0" />
</Entity>



Each object have two functions called "SetParameter(const std::string &name, const std::string &value)" and "const std::string &GetParameter(const std::string &name);". Each parameter is stored in a std::map<string, string>.

Here's an example
SetParameter("position", "10.0, 0.0, 0.0"); // Set position of the object at 10.0f, 0.0f, 0.0f
std::string pos = GetParameter("position"); // Get the position of the object
(Of course I defined others methods to get position as a vector of float to speed up things).

So with this king of approach, I think you can make a function called "void Save(void)" who looks throught the 'map' and save each value in a file *very* easily.


Here's some tips:
- Convert each "name" parameter to lower case to avoid conflicts like : "Position", "position", "pOsition", "POSITION"....
- Use a "dictionnary" where you put "legal name" values to avoid this king of situation : bool ret = SetParameter("text", "pouet pouet") applied to a sound object (it would return false here).
- Use XML (like in my example) !
- Use the force Luke ! Oops, nothing to do here that :)


Hope this will lead You to a solution...

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I dont think it's necessary to save everything including splatter on the walls. That's just excessive and players will understand if they are missing (if they notice at all). I would save only things that are necessary to the progress of the game.

As for what happens with things that go on during a save: pause the game before saving and unpause it after.

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