Introduction to 3D Graphics and VRML

Geometric primitives (cont...)

Tristrips

• Group of triangles, each of which share two vertices
• Stored as a list of vertices
• More efficient storage and access than plain triangles

Polystrips

• Triangles share a common vertex
• Efficient storage and processing

Pmeshs

• Group of faces
• Stored as two lists
  1. List of vertices
  2. Face definitions in terms of list indices into list 1
• Efficient storage and rendering