rgl | RGL is a framework for graph data structures and algorithms

Do you want to use fractions as determiners ("eineinhalb Katzen"), or just standalone noun phrases ("eineinhalb")? Either way, there are a couple different ways, none of which requires extending NPs.

Unfortunately, the RGL oper for mkCard expects input like "35", and it gives an error if you type letters or decimal points.

But if your fractions don't inflect, or even if they inflect in the language but your application doesn't need the inflection, then the easiest way is to use Symbolic module, particularly the following pair of opers

The cylinder3d function can do that. You specify two points (the center of the top and bottom), and the two radii. For example,

The solution was to set RGL_USE_NULL: true in the env: section,.. thanks to @user2554330 (Package rgl in R not loading in Mac OS)

The model used in rgl subscenes is that the root owns all the objects, and each subscene displays some of them. Your code starts by displaying setosa and versicolor in the first subscene and setosa2 and versicolor2 in the second one, but the the subset control says to display both setosa and setosa2 in one subset, and both versicolor and versicolor2 in the other, and do this in both subscenes. Since setosa and setosa2 have the same shape and location, only one appears at a time: the first drawn.

To get what you want, you need two subsetControls, both controlled by the same playwidget, e.g.

The syntactic function of "Taylor" in that sentence is a modifier to "song". So the grouping isn't "a Taylor", but rather "a song", with Taylor as a modifier:

• a song
• a good song
• a Taylor song

This answer doesn't necessarily work in other languages than English. But there are plenty of other structures you can use straight out of RGL, like "a song by NP".

If you have a fixed set of artists, it's probably easiest to just cheat and make them into adjectives in English. Here's an example:

The results from both spheres3d and text3d are rgl ids, which are simply integer values with a class. You can just use c() to join them into vectors. Modify your example to this and it works:

Just to make it clear for anyone reading this answer and not the previous:

someWord ** {s = "some string"} is a hack and there's no guarantee it will work, when the RGL updates.

I did suggest that hack, because it can be useful: sometimes the RGL doesn't output exactly what you want it to do, but it's not really an error that should be fixed upstream. Then you can override some RGL definition locally in your application grammar, but you should be aware of the potential instability.

Now on to the answer to this question.

You're trying to do this:

The rgl package doesn't use the same formatting functions as base graphics, so you need to format the values yourself. For example,

A plane is infinite.
rgl calculates visualization cube limits according to the max limits from all non infinite objects in the scene.
If the plane doesn't belong to the max limits cube, you won't see it.
On the contrary, if the scene contains as an example a cube crossed by the plane, the plane appears: