Now let us see how to embed it seamlessly in a document. In a previous note, we have shown an example of TeXmacs native graphics generated with Scheme, a triangle inscribed in a half-circle. Keeps track of the position of the tree inside the global document tree and can be used to programmatically modify documents. Embedding graphics composed with Scheme into documents. Frankenstein tells the story of Victor Frankenstein, a young scientist who creates a sapient creature in an unorthodox scientific experiment. TeXmacs in 60 minutes, a hands on tutorial by Andreas Seidl. Frankenstein or, The Modern Prometheus is an 1818 novel written by English author Mary Shelley. TeXmacs quick start guide, an introduction by Nicolas Ratier, which fits on one A4. Notice that they are somewhat outdated, so some of the menu entries and keyboard shortcuts may have changed in the meanwhile. Active trees (tree).TeXmacs internal C++ type tree which is exported to Scheme via the glue. The following tutorials can be used to get started with TeXmacs. Note that this doesn't explicitly handle things like different focal lengths in the Shadertoy code, we approximate this by simply pretending the sensor rectangle is larger or smaller than it actually is.Even the best l\enses also have lens distortion and other higher-order effects, which we don't account for. convenient to manipulate content directly using standard Scheme routines on lists.