Hey!

I have an equation F(a,b) = ( X(a,b), Y(a,b), Z(a,b) ) and i want to create a 3D voxel image out of it ( like this ). Therefore i create a new empty image and run through it. For every voxel i check if i'm inside or outside of the object that the equation F(a,b) describes. There is my problem. How can i convert the equation F(a,b) so that i can check for a point (x,y,z) if i'm inside or outside?

Thanks for your help.