This 3D demo gives a hint as to how the visionary architect Gaudi used straight lines to create curvatures in his architecture such as Sagrada Familia in Barcelona. Imagine lifting up a corner of a square with a grid. Up/Down Right/Left arrows and a/z keys rotate the object along the x,y,z axis.
The 3D interface is a based on a projection algorithm I developed some years ago to make Geometer's Sketchpad display 3D curves. I learned a tremendous amount from @Mr_Pyro_ 3D Wireframe Engine project about optimizing rendering and keyboard effects. Much much thanks.
