Prof. Krzysztof Walczak attended an international conference The 5th Joint Virtual Reality Conference JVRC 2013, which was held in Paris on December 11 – 13, 2013. During the conference prof. Krzysztof Walczak presented a paper entitled „Semantic Modelling of Interactive 3D Content” (authors: Flotyński, J., K. Walczak). On December 12th, 2013 Prof. Walczak participated also at the General Assembly ordinary session of the EuroVR Association, a non-profit, scientific and industrial European association that was founded to continue and expand the work initiated by the INTUITION Network of Excellence (EC FP6 NoE) as a self-sustainable, independent organization to support the virtual and augmented reality communities. Prof. Walczak is a member of the Executive Board of the EuroVR Association.