Specular

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

Section

lighting.specular controls the intensity of the specular highlight — the bright spot where the light source directly reflects toward the camera. Range is 0.0 (no highlight) to 2.0 (very strong). Default is 0.05.

alias Plotly.{Figure, Surface}

z = for i <- 0..24 do
  for j <- 0..24 do
    r = :math.sqrt((i - 12) * (i - 12) + (j - 12) * (j - 12))
    if r < 12, do: :math.sqrt(max(0, 144 - r * r)), else: 0
  end
end

Figure.new()
|> Figure.add_trace(Surface.new(z: z, colorscale: "Earth", lighting: %{specular: 0.05}))
|> Figure.update_layout(title: "Specular: 0.05 (default, subtle)")
|> Plotly.show()

Figure.new()
|> Figure.add_trace(Surface.new(z: z, colorscale: "Earth", lighting: %{specular: 2.0}))
|> Figure.update_layout(title: "Specular: 2.0 (very shiny)")
|> Plotly.show()