Hello,

I have problem with creating 3D plot of this function:

a:=(alpha,H,gamma)->(Pi^2/(4*alpha)-Pi/2+1)*2/H*(sin(gamma/2)^2):

where

alpha, H, gamma > 0 ... independent variables,

a ... dependent variable.

3D plot should be an set of 3D points in "alpha", "H" and "gamma" range (x, y, z coord.), value of dependent variable "a" should be indicated by color of each point.