3D IsoSurface plots

   

Summary: This example shows how to create 3D-IsoSurface charts in F#.

let's first create some data for the purpose of creating example charts:

open System
open Plotly.NET 

let linspace (min,max,n) = 
    if n <= 2 then failwithf "n needs to be larger then 2"
    let bw = float (max - min) / (float n - 1.)
    Array.init n (fun i -> min + (bw * float i))

let mgrid (min,max,n) = 

    let data = linspace(min,max,n)

    let z = [|for i in 1 .. n do [|for i in 1 .. n do yield data|]|]
    let x = [|for i in 1 .. n do [|for j in 1 .. n do yield [|for k in 1 .. n do yield data.[i-1]|]|]|]
    let y = [|for i in 1 .. n do [|for j in 1 .. n do yield [|for k in 1 .. n do yield data.[j-1]|]|]|]

    x,y,z

let xIso,yIso,zIso = 
    mgrid(-5.,5.,40)
    |> fun (x,y,z) ->
        (x |> Array.concat |> Array.concat),
        (y |> Array.concat |> Array.concat),
        (z |> Array.concat |> Array.concat)

let valueIso =
    Array.map3 (fun x y z ->
        x * x * 0.5 + y * y + z * z * 2.
    ) xIso yIso zIso

open Plotly.NET.TraceObjects

let isoSurface =
    Chart.IsoSurface(
        xIso,yIso,zIso,valueIso,
        IsoMin = 10.,
        IsoMax = 40.,
        Caps = Caps.init(
            X = (CapFill.init(Show=false)),
            Y = (CapFill.init(Show=false))
        ),
        Surface = Surface.init(Count=5),
        ColorScale = StyleParam.Colorscale.Viridis
    )