I have implemented zooming and panning in my WPF app using a RenderTranform combining scaling and translations.
Everything is peachy with bitmaps, text, graphic paths, shapes and more. As soon as I put a viewport3d in the visual tree and I zoom into the picture, performance drops to terrible (non-interactive!) levels.
Any suggestions?
I have already read this page http://msdn.microsoft.com/en-us/library/bb613553.aspx and followed all recommendations applicable to my app. That allowed me to zoom in a bit deeper in the view but not enough...