hide editor by default (for more prettyness)

glsl/raymarching.js

  tt.render();
  
  var editor = {};
  editor.visible = true;
  editor.visible = false;
  editor.el = document.createElement("textarea");
  editor.el.id = "editor";
  editor.el.style.display = "none";
  editor.el.value = tt.fragmentShaderSrc;
  document.body.appendChild(editor.el);