There are several engines that are used for generating 2D and 3D graphics and it is difficult to choose the best among them. A 3D graphics render engine is an engine which transforms 3D objects from a 3D scene into 2D images, by using different mathematical algorithms. 3D scene models are mathematical representations of dots and surfaces. To make mathematical representations visible as real objects, it is necessary to render them with help of a render engine. Render engines take mathematical estimates and calculate different elements of the scene i.e. the reflection and the refraction of light, in order to get the most realistic possible 2D image. That is the most complex part of the production and it takes a lot of knowledge and time to take it to perfection. This diploma essay will deal with several types of 3D graphics render engines within Blender 3D programming tool. It will cover renderers, using several different 3D scenes that will be created within Blender 3D. The focus will be on the realistic quality of 2D image and the speed of the rendering. Some of the render engines dealt with in this essay are Blender Internal Renderer, Yafaray, Luxrender and Cycles. All the mentioned render engines are open source and one of the aims of the essay is to check the possibility to use free software instead of commercial options.