Irrlicht Engine

how can I leave room for new players? let's say that there can be up to 100 players. must i preload all 100 nodes? and if yes, how would it be done optimally?

why would you think you'd need to preload them? as each additional player enters it's easy enough to create a new node (plus, chances are, you already have the mesh loaded, unless every player has their own unique mesh.. remember: to a first approximation, a node is an object in the environment, each object has its own node so it can be moved, textured, etc. independently.. the shape of each node is specified by a mesh. if more than one node has the same shape, you can just load the mesh once and attach it to each node as it is created)