The 17th ACM International Web3D Conference will address a wide range of research topics related to Web-based 3D graphics (like X3D/ X3DOM/ Dec3D). The Conference will be held in Los Angeles in conjunction with SIGGRAPH 2012 on August 4-5, 2012.
The full call for papers is at http://web3d2012.org/submission.html
Extended paper/poster submission deadline: April 16th, 2012