stl_to_shape: STL to shape
In oganm/rdog: R port of the zdog pseudo-3D rendering engine

Creates a shape from an ASCII stl

stl_to_shape(rdog = NULL, id = NULL, stl, colorAxis = "z",
  colorMin = "#FFFFFF", colorMax = "#000000", visible = TRUE,
  colorMode = c("mean", "extreme", "ordered"), objectOffset = c(x = 0,
  y = 0, z = 0), stroke = 1, addTo = NULL, translate = c(x = 0, y =
  0, z = 0), rotate = c(x = 0, y = 0, z = 0), scale = c(x = 1, y = 1, z
  = 1))

`rdog`	rdog object to add the shape to. Can be a character if called from a code block in shiny
`id`	id of the anchor. If NULL, a random id will be assigned
`stl`	contents of an ascii stl file as a character or path to an stl file
`colorAxis`	axis to apply the color gradient
`colorMin`	Starting color of the color gradient
`colorMax`	Ending color of the color gradient
`visible`	Is the object visible
`colorMode`	How to apply the color gradient. `mean` will color each triangle based on the mean of their `colorAxis`, `extreme` will color each triangle based on the maximum and minimum `colorAxis` for the triangle. `ordered` will ignore `colorAxis` and just colors vertexes in the order they appear. Depending on how the file was constructed, this may or may not create a sensible image.
`stroke`	Stroke to add to the polygons.
`addTo`	Id of the parent object. If an rdog object is piped and addTo is set to NULL, the default parent will be the illustration itself.
`translate`	Position relative to the origin. Origin point is defined based on `addTo` parameter. A vector with named x, y, z elements.
`rotate`	Set rotation. Unit is radians. Use with `pi` constant. A vector with named x, y, z elements.
`scale`	Scale dimensons. Can be an unnamed integer or a vector with named x, y ,z elements