+# Material for models, or how to draw the model
+#
+# To create a simple basic blueish material, use `new Material`.
+#
+# Each class of material is associated to a `GLProgram` and its GPU shaders.
+# The simple material `SmoothMaterial` allows to set an ambient, diffuse and specular color.
+# To which `TextureMaterial` adds three textures, for each kind of light.
+# The `NormalsMaterial` may be useful for debugging, it show the orientation of
+# the normal vectors as colors.
+#
+# ~~~
+# import gamnit::depth
+#
+# var blueish_material = new Material
+# var redish_material = new SmoothMaterial([0.3, 0.0, 0.0],
+# [0.6, 0.0, 0.0],
+# [1.0, 1.0, 1.0])
+# var normals_material = new NormalsMaterial
+# ~~~