About this 3D model
First I use this formula to obtain my sand castle: z = cos(x)1.5 cos(y)1.5.Then, I searched a way to increase the central peak. I finally found the following formula: z = -(cos(x)cos(y)*(-2(e^(-1/4(x^2+y^2)))-2))
First I use this formula to obtain my sand castle: z = cos(x)1.5 cos(y)1.5.Then, I searched a way to increase the central peak. I finally found the following formula: z = -(cos(x)cos(y)*(-2(e^(-1/4(x^2+y^2)))-2))