Multi-Chart Geometry Image Rendering with

Bow-Legged Iterative Chart-Boundary-Straddle Hole Stitching Method

AKA

Hole Filling Multi-Chart GIM�s

By Stephen Brown and Pete Lawrence

Abstract

Geometry images offer a way to re-mesh a surface using a regular sampling of vertices.� Easy reconstruction, down-sampling, and efficient traversal are a few benefits of using a geometry image.� Creating a geometry image involves parameterizing the surface into a square-planar domain and re-sampling the surface on a regular grid.� Although this offers the benefits previously mentioned, it can lead to distortion of the original surface.� Another type of geometry image called a multi-chart geometry image can be used to cut down on the distortion, while still allowing the benefits of geometry images in general.� Creating a multi-chart geometry image involves cutting the surface into several pieces called charts before parameterizing to the planar domain.� Multi-chart geometry images, however, cause cracks between charts in the re-meshed surface.� The goal of our project is to fill the cracks in the re-meshed surface that were created by the multi-chart geometry image.� To fill the cracks we implemented our own stitching algorithm that is similar to zippering.� The main difference between the two is that while zippering distorts faces to fill cracks, stitching creates additional faces.� This results in a watertight re-meshed surface with less distortion in areas where cracks used to exist.