Hello there, I am developing an 3D animation program, which allows the user to specify control nodes along a path. The user can then assign objects to that path so that their position can then be interpolated. The user will also have the option of controlling the speed along the path, by altering the speed at each control node. This is where my problem lies, as I can only manage to get it to work for a constant speed. The interpolation methods that I am using do not take into account the speed at the nodes, but just require a value ''t'', which can vary from 0 to 1, to interpolate from the first node to the second respectively. As the rate at which the value ''t'' is passed to the function alters the speed of the object, I am attempting to pass this value non linearly, depending on the speed of the two nodes. If anybody has any alternative suggestions, or knows how to do this successfully, then your help would be much appreciated. Thanks in advance. Jon Allsop. Swansea University, UK.