flypig.co.uk

The latest version of Functy is now available with the exciting new addition of 'curves'. This new function type allows parametric curves to be defined using cylindrical co-ordinate cross sections. All of the functions can also be rendered entirely on the GPU, including per-pixel lighting with normals calculated per-pixel from the function derivative (rather than using interpolated normals). Grab it if you're interested from the Functy website.