The operation of the robotic arm can be simulated using a computer. This paper shows how to simplify complicated functions and the importance of programming rules. A computing environment (interface and programming language) was developed to simulate the robotic arm using Unity Engine and C# for programming. This paper explains the prerequisites and development of the project from start to finish. An explanation of the methods used and the scripts written is given. The tool used in the work is also presented. Unity 3D is a cross-platform programming tool developed by Unity Technologies, which is primarily used for the development of video games, simulations for PCs, consoles and mobile devices. It quickly developed into the most used tool and since 2005 has been expanded to 27 platforms. The experience with the development tool Unity 3D is positive, because it contains a lot of materials and practical examples that help in the work. When a problem was encountered, a solution was found after several searches. All this is possible with a large community that is ready to ask, and also help with every question of an individual. Unity as a programming tool is easy to use and the user's creativity can easily be transferred to any project.