3D Cone Lighting

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

Section

Cone supports the same lighting: properties as Surface and Mesh3d: ambient, diffuse, specular, roughness, fresnel. lightposition: %{x:, y:, z:} sets the light source in scene coordinates. High specular + low roughness = glossy; high roughness = matte.

alias Plotly.{Figure, Cone}

# Dense grid for impressive lighting demo
positions = for x <- [-1, -0.5, 0, 0.5, 1],
                y <- [-1, -0.5, 0, 0.5, 1],
                z <- [-1, -0.5, 0, 0.5, 1], do: {x, y, z}

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

# Radially outward field
us = xs
vs = ys
ws = zs

Figure.new()
|> Figure.add_trace(
  Cone.new(
    x: xs, y: ys, z: zs,
    u: us, v: vs, w: ws,
    colorscale: "Viridis",
    sizemode: "absolute",
    sizeref: 0.3,
    lighting: %{
      ambient: 0.3,
      diffuse: 0.8,
      specular: 2.0,
      roughness: 0.3,
      fresnel: 1.0
    },
    lightposition: %{x: 1000, y: 1000, z: 1000},
    showscale: false
  )
)
|> Figure.update_layout(
  title: "3D Cone Lighting",
  scene: %{
    xaxis: %{title: "X"},
    yaxis: %{title: "Y"},
    zaxis: %{title: "Z"}
  }
)
|> Plotly.show()