Triangles and quadrilaterals are fundamental geometry representations that are
typically created by authoring tools to build complex polygonal meshes and shapes.
Low-level high-performance nodes for geometry definition and fast rendering include
Special definition rules apply to each node in order to best match underlying graphics hardware requirements.
Each is placed individually inside a
Chapter 13 slideset
and course videos
for X3D for Web Authors are available online via
X3D Scene Authoring Hints: Meshes.