I wandered around forums and sites about 3d iso and I only found simple iso engine, personnaly I implemented ones years ago (and I continue it these days) and it does not require any restrictions about height,width,length of the tiles... It just required a 3D envelopp and a hotspot. 3D envelopps are 3D-compared and it may be possible to build a tree-based map of the elements to indicate the order of appearance of the elements (the "sons" are send to the screen after the "fathers"). Does any game use this sort of engine ? I find it much more powerfull than engines based on "layers", ground, etc ... Thierry