Gallery

One of the limitations of the Half-Edge data structure is that it can only support 2-Manifold surfaces. At first I didn't really pay too much attention to this restriuction. However, when I started loading in Wavefront .obj models I found that a LOT of these models are NOT 2-Manifold. This caused my program to fail miserably. In order for me to subdivide these models I had to hack the data and remove all offending faces. This solved the problem in most cases but in some caused the model to have strange artifacts. All the models in the "complex" area are "fixed" in this way

Boundary	Models that demonstrates subdivision along the boundaries. Note Peters subdivision is NOT used on these models since it doesn't have any boundary rules.
Complex	Relatively large models that are publically available from the Avalon archive. These models were originally non 2-Manifold and had to be "fixed"
Simple	Simple, smaller models
Custom	Custom model created by hand.

Observations :

In general the Loop and Sqrt(3) has the best image "quality" (quality metric is my eyes).

Sqrt(3)achieves the same image quality as Loop with fewer triangles.

ModifiedButterfly yields weird looking surfaces especially on models that are naively triangulated (via triangle fans)
Extrodinary vertices can cause un-expected results

Peters surfaces usually yields the worst looking surfaces. However it is "immune" to artifacts caused by extrodinary vertices as shown by the cube example