Hi, Solvespace is a very powerful program, thank you for sharing it with others. I�m always finding new problems to solve with it. However the method used in Solvespace to rotate 3D object views via middle-button(or wheel)-down mouse dragging is not always intuitive to the user. Sometimes the object moves in the opposite direction to which the user intuitively drags it. I ran into this same mouse dragging 3D rotation problem several years ago when I wrote a very simple 3D magnetic field line rendering program using the Visual Basic 6.0 programming language. I finally solved the problem by implementing a virtual trackball in code. With virtual trackball implementation visual objects can quickly and intuitively be dragged to the user�s desired orientation. Explaining how virtual trackball code works is very difficult, but if you have a copy of Visual Basic 6.0 you may download my program source code from �Planet-Source-Code�. Go to the Planet Source Code home page and search for: �Magrid 1.0, A 3D magnetic field line rendering program� Examine the source code and run it - you�ll see what I mean. Thanks again for sharing Solvespace and I hope this information may be of use to you.
Randy Manning