Isosurface with Additional Slices

Mix.install([
  {:plotly_ex, "~> 0.3"},
  {:kino, "~> 0.18"}
])

Section

slices: %{x: %{show: true, locations: [0]}, y: ..., z: ...} cuts cross-section slices through the volume at the specified axis positions. The slice reveals the scalar field interior — useful for understanding the full 3D structure. Combine with an isosurface for context.

alias Plotly.{Figure, Isosurface}

n = 20
vals = Enum.map(0..(n - 1), &(&1 / (n - 1) * 4 - 2))

grid = for x <- vals, y <- vals, z <- vals, do: {x, y, z}

xs = Enum.map(grid, &elem(&1, 0))
ys = Enum.map(grid, &elem(&1, 1))
zs = Enum.map(grid, &elem(&1, 2))

values = Enum.map(grid, fn {x, y, z} -> x * x + y * y + z * z end)

Figure.new()
|> Figure.add_trace(
  Isosurface.new(
    x: xs, y: ys, z: zs,
    value: values,
    isomin: 1,
    isomax: 4,
    colorscale: "RdBu",
    showscale: true,
    opacity: 0.3,
    slices: %{
      x: %{show: true, locations: [0]},
      y: %{show: true, locations: [0]},
      z: %{show: true, locations: [0]}
    }
  )
)
|> Figure.update_layout(
  title: "Isosurface with Cross-Section Slices",
  scene: %{
    xaxis: %{title: "X"},
    yaxis: %{title: "Y"},
    zaxis: %{title: "Z"}
  }
)
|> Plotly.show()