Document label 3d and text mesh (4.0)

tutorials/3d/3d_text.rst

@@ -0,0 +1,49 @@
+.. _doc_3d_text:
+
+Introduction
+============
+
+In a project there may be times when text needs to be created as
+part of a 3D scene and not just in the HUD. Godot provides two
+methods to do this. The Label3D node and the text mesh for a
+MeshInstance3D node.
+
+This page does **not** cover how to display a GUI scene in a 3D
+environment. For information on how to do that see `this <https://github.com/godotengine/godot-demo-projects/tree/master/viewport/2d_in_3d>`__
+demo project.
+
+Label3D
+-------
+
+.. image:: img/label_3d.png
+
+Label3D behaves like a label node but in a 3D space. Unlike label
+node this can not inherit properties of a GUI theme. However its
+look remains customizable and uses the same font subresource
+control nodes use.
+
+Label3D has minimal interaction with a 3D environment, it can be lit
+up and shaded by light sources if the shaded flag is enabled, but it
+will not cast a shadow, even with cast shadow turned on under the nodes
+GeometryInstance3D settings. This is because the node is a quad mesh
+(one glyph per quad) with transparent textures and has the same limitations
+as Sprite3D. See :ref:`this page <doc_3d_rendering_limitations_transparency_sorting>`
+for more information.
+
+Text mesh
+---------
+
+.. image:: img/text_mesh.png
+
+Text meshes have similarities to Label3D. They display text in a 3D
+scene, and will use the same font subresource. However text is 3D and
+has the properties of a mesh. A text mesh cast shadows onto the environment
+and can have a material applied to it. Here is an example of a texture and
+how it's applied to the mesh.
+
+.. image:: img/text_mesh_texture.png
+
+.. image:: img/text_mesh_textured.png
+
+There are two limitations to text mesh. It can't use bitmap fonts, or fonts
+with self intersection.

tutorials/3d/index.rst

@@ -19,3 +19,4 @@
    using_multi_mesh_instance
    csg_tools
    procedural_geometry/index
+   3d_text