Usage: 

$ dot -Tvrml input.dot

VRML

Virtual Reality Modeling Language

Outputs graphs in the VRML format. To get a 3D embedding, nodes must have a z attribute. These can either be supplied as part of the input graph, or be generated by neato provided dim=3 and at least one node has a z value.

Line segments are drawn as cylinders. In general, VRML output relies on having the PNG library to produce images used to texture-fill the node shapes. However, if shape=point, a node is drawn as a 3D sphere.

Example: simple graph, rendered with -Tvrml 

$ echo 'digraph { a->b }' | dot -Tvrml

#VRML V2.0 utf8
Group { children [
  Transform {
    scale 0.028 0.028 0.028
    children [
 Background { skyColor 1.000 1.000 1.000 }
# node a
Transform {
  translation 27.000 90.000 0.000
  scale 27.000 18.000 1
  children [
    Transform {
      rotation 1 0 0   1.57
      children [
        Shape {
          geometry Cylinder { side FALSE }
          appearance Appearance {
            material Material {
              ambientIntensity 0.33
              diffuseColor 1 1 1
            }
            texture ImageTexture { url "node1.png" }
          }
        }
      ]
    }
  ]
}
# node b
Transform {
  translation 27.000 18.000 0.000
  scale 27.000 18.000 1
  children [
    Transform {
      rotation 1 0 0   1.57
      children [
        Shape {
          geometry Cylinder { side FALSE }
          appearance Appearance {
            material Material {
              ambientIntensity 0.33
              diffuseColor 1 1 1
            }
            texture ImageTexture { url "node2.png" }
          }
        }
      ]
    }
  ]
}
# edge a -> b
 Group { children [
Transform {
  children [
    Shape {
      geometry Cylinder {
        bottom FALSE top FALSE
        height 25.584 radius 1.000 }
      appearance Appearance {
        material Material {
          ambientIntensity 0.33
          diffuseColor 0.000 0.000 0.000
        }
      }
    }
Transform {
  translation 0 17.792 0
  children [
    Shape {
      geometry Cone {bottomRadius 3.500 height 10.000 }
      appearance Appearance {
        material Material {
          ambientIntensity 0.33
          diffuseColor 0.000 0.000 0.000
        }
      }
    }
  ]
}
      ]
      center 0 5.000 0
      rotation -0.000 0 1.000 -3.142
      translation 27.000 49.000 0.000
    }
] }
  ] }
  Viewpoint {position 1.000 2.000 6.438}
] }

Last modified June 19, 2021 : Add examples for plaintext formats. (0dc3efd)