Last Updated
March 18, 2010

## Polygon meshes & polyhedrons

- What is the volume of a 3D point? a 3D ray? a 3D line? a 3D polygon?
- Describe 3 data structures to represent a mesh.
- In an “
*Explicit Vertex Mesh Representation”* each polygon is stored as a list of vertex coordinates. What problems might this representation cause?
- Distinguish between
*“winged edge list ” *and* “index to vertex list“ *mesh representations.
- Why are triangle strips used in preference to triangle primitives in real time graphics?
- Which of the shapes {A,B,C,D,E} below are;
- regular polygons
- convex polygons
- concave polygons

- Give a description of the "Index to Vertex list" method for representing a polygon mesh. Include in your discussion an example.
- Describe and compare 3 methods for representing polygon meshes.
- What are “triangle-strips” and why are they used in preference to triangle primitives in real-time graphics?

© Ken Power 1996-2016