Product Back Log GUI - Ipad rotation. - New edit dialog. - Possibility to remove colors. - Possibility to add custom constants (Theis' idea). - Grid/Point/Solid view option. - Fast implicit option. BACKEND - Axis labels. - Bounding box. - Otimization (Marching cubes). - GPU Acceleration - Freeze parametric first variabel to t, second variable to u. - Support of spherical coordiantes. Done-(and hopefully wokring)-LIST - Performance optimization (when changing colors). - Improved handling of visibility. - Support of parametric functions. - Support of implicit functions. - Scroll-Wheel zooming. - Function object refactoring.