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3D objects are commonly modeled as polygonal meshes. Meshes describe the surface using a set of vertices, their positions in 3D space and incidence relation among vertices that compose edges and faces. Other mesh attributes include texture coordinate, normal, etc. Mesh compression has been an active research topic for over a decade now. However, growing demand from areas like gaming, animation, AR and VR, online commerce and cultural heritage applications has created the need for efficient coding technologies with reduced network bandwidths and optimal rate distortion performance. To overcome the challenges of existing state of the art mesh coding methods and support the next generation 3D immersive experiences, the Visual Volumetric Media (VVM) working group in AOMedia issued a Call for Proposals (CfP) on Static Polygonal Mesh Coding (PMC) in May 2023. The standard is expected to be finalized by the end of 2025. This tutorial will first introduce mesh representation and mesh coding followed by an overview of standard development timeline and common test conditions. Then, the fundamental building blocks in PMC and some of the major lossless coding tools will be discussed in depth. This includes geometry traversal and connectivity coding, geometry predictive coding, attribute coding as well as advanced prediction schemes. Later, the lossy PMC codec will be discussed which offers spatial scalability via decimation, iterative mesh subdivision and displacement coding. PMC has already achieved an average coding gain of more than 30% over Draco, a leading mesh compression library. Moreover, PMC offers a more generalized solution to mesh coding due to its ability to handle higher polygon meshes and non-manifold topologies. These aspects of the standard make this tutorial very relevant to students and industry professionals working on a wide range of topics from conventional video coding to immersive media processing.
3D objects are commonly modeled as polygonal meshes. Meshes describe the surface using a set of vertices, their positions in 3D space and incidence relation among vertices that compose edges and faces. Other mesh attributes include texture coordinate, normal, etc. Mesh compression has been an active research topic for over a decade now. However, growing demand from areas like gaming, animation, AR and VR, online commerce and cultural heritage applications has created the need for efficient coding technologies with reduced network bandwidths and optimal rate distortion performance.
To overcome the challenges of existing state of the art mesh coding methods and support the next generation 3D immersive experiences, the Visual Volumetric Media (VVM) working group in AOMedia issued a Call for Proposals (CfP) on Static Polygonal Mesh Coding (PMC) in May 2023. The standard is expected to be finalized by the end of 2025. This tutorial will first introduce mesh representation and mesh coding followed by an overview of standard development timeline and common test conditions. Then, the fundamental building blocks in PMC and some of the major lossless coding tools will be discussed in depth. This includes geometry traversal and connectivity coding, geometry predictive coding, attribute coding as well as advanced prediction schemes. Later, the lossy PMC codec will be discussed which offers spatial scalability via decimation, iterative mesh subdivision and displacement coding.
PMC has already achieved an average coding gain of more than 30% over Draco, a leading mesh compression library. Moreover, PMC offers a more generalized solution to mesh coding due to its ability to handle higher polygon meshes and non-manifold topologies. These aspects of the standard make this tutorial very relevant to students and industry professionals working on a wide range of topics from conventional video coding to immersive media processing.
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