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The game data (art, characters, items, etc) are generated by the build pipeline, this is a set of scripts that you setup. It typically takes 30+ hours to build all the art as there are many things it has to do to get all the art ready for use in the game. Take a look at the guide How to set up the Build Pipeline for information on setting up the pipeline. For information on the layout of the database check out the Database Structure
Setting up a Patch Server
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Modifying the "Words" Displayed in the Client
Ryzom Core has a localization system that uses language files to display different messages depending on the currently selected language of the client, to modify the text in game you need to edit these files, check out Localization system in Ryzom
Running the World Editor
Running the world editor is pretty easy, check out Running the World Editor.
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Creating your own Buildings
There are two ways of adding buildings to Ryzom Core: dynamic (aka botobject) and static.
Creating your own Trees and Bushes
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Creating your own character in Ryzom Core is done in 3ds Max, documentation on it is at Character Creation.
Edit character speed
Adding NPC's
Check Adding Mobs for information on adding mobs to the game, this is the same procedure for attackable and non-attackable mobs.
For more information on making creatures, you can read Working with creature sheets
For information on using the chat_parameters for NPCs on the npc_bot object, look at the guide on Configuring NPC Chat Parameters
For information on configuring NPC group parameters, look at the guide on Configuring AI Group Parameters
Adding Items
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You can add items by editing sheets, some info can be found in Working with sheets
Creating Missions
Adding Single Player Quests
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All quests and missions can have camera animations, check Adding Camera Animations for information.
Adding Music and Sound
Adding Skills
Setting up Combat Sheets
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The Ryzom Core Particle System is created using the Particle System Editor.
Ingame Browser
The functionality of the Ingame browser decomposed.