The 18th ACM International Web3D Conference will address a wide range of research topics related to Web-based 3D Graphics. These topics include: representation and modeling methods, content analysis, rendering, distributed virtual environments, large-scale databases, Web-wide human-computer interaction, as well as innovative tools and applications. On the one hand, collaborative authoring and delivering of educational, multimedia, industrial, medical, gaming and GIS contents is one of the main interests of this edition of the conference. On the other hand, the conference will particularly focus on innovative 3D graphics Web applications and novel developments for several sectors including but not limited to eHealth, Transport, Industry, Education, Audiovisual or Tourism, aside from contents over 3D Internet. The annual ACM Web3D Conference is a major event that gathers researchers, developers, entrepreneurs, experimenters, artists, and content creators in a dynamic environment. Attendees can share and explore methods of using, enhancing, and creating new 3D Web and Multimedia technologies, such as WebGL and HTML5 (which is a hot topic in Computer Graphics), Flash/ Stage 3D, X3D, COLLADA, and the MPEG family. Relationship of Web3D with OGC is also a hot topic. The conference highlights capabilities and trends in interactive 3D graphics across a wide range of applications and supports research from mobile devices up to high-end immersive environments.