i am doing a chess board game and when i start to do it,i use a huge map. Some days i decide to change the lenght of the entire map. There is a problem in do it?? what i can loose if i change a lot the lenght of a world???? (quality?,ect..)

Not sure if I understand the question, but if you just want to scale the whole level then that's not a problem. Just drag-select all geometry in your level and then scale it down. However, if you use entities in your level, you will have to scale them separately in WED,MED or by CScript commands.

i think what he is saying is how is the quality affected depending on the scale,
eg smaller scales mean better quality, than larger scales ?!?!?!

not to sure on the answer for this one, if your chessboard is a block within wed then quality will pretty much remain the same as the texture will not be stretched but instead more tiles of the same texture are automatically created.

However, as you are creating a chessboard, you will only want your texture to tile so many times so that you have the correct number of squares. therefore if you increase the scale of the level to compensate this you will have to increase the scale of the textures.

It basically depends on what you are doing. But you wont really want your chess board that big.

Hope this is of some help to you
Chris

Textures are drawn on map entities at a set rate. If you change the scale up/down, the textures will repeat more/less times. At one size a room may look small because the bricks and windows are in proportion, but if you scale the all models up, the bricks will be small. In a chess game you probably use mostly models so there's no difference.

Of course if you resize the bitmaps you'll be okay even with level buiiding. There's also a matter of decimal places also but I've never run into it as an issue (in my small experience). Scaling models can also affect collisions.