Mathematical Function Plot
Description	Plot of gamma(z)
Equation	${\displaystyle z=|\Gamma (x+\mathrm {i} y)|}$
Coordinate System	Cartesian
X Range	-4.5 .. 5
Y Range	-5 .. 5
Z Range	0 .. 6

 

This diagram was created with Mathematica.

Plot3D[Abs[Gamma[x + I y]], {x, -4.5, 5}, {y, -5, 5},
  PlotPoints -> 400, PlotRange -> {0, 6}, ViewPoint -> {-2, -2.5, 1},
  Boxed -> False, BoxRatios -> Automatic, 
  AxesEdge -> {{-1, -1}, {-1, -1}, {1, -1}},
  Mesh -> {9, 9, 5}, MeshStyle -> {Black, Black, Opacity[0.4]},
  MeshFunctions -> {Min[#1, 2*(#1 + 2)] &, #2 &, #3 &},
  RegionFunction -> Function[{x, y, z}, Abs[Gamma[x + I y]] <= 6],
  AxesLabel -> {Re[z], Im[z]}, PlotLabel -> Style[Abs[Gamma[z]], 20]]

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