Thea Render is the most versatile render solution, uniquely featuring multiple state-of-the-art biased and unbiased photo-realistic render engines. Thea Render is a physically-based global illumination renderer of high quality. Thea Render comes with its own standalone application (Studio) for the most intuitive setup and advanced staging operations.

The unbiased engines have essentially no parameters, thus rendering can start right away without worrying about render setup. Unbiased engine TR1 should be preferred in exterior renders and interiors where direct lighting is the most dominant in the scene while unbiased engine TR2 should be preferred in cases of ultra difficult lighting. In practice, TR1 can handle very difficult indirect lighting scenes and even "sun pool caustics", thus TR2 should be actually used in extremely difficult light transfer situations  (like in the case of caustics lighting a scene). The Adaptive BSD biased engine, based on the well-known photon mapping and final gathering techniques, gives the user the absolute control of what features should be rendered (at the expense of setup time). The next renders have been made with different engines inside Thea Render.

Although, one could say that a renderer featuring multiple render engines would only give average results, this is not true for Thea Render; all render engines are proprietary one with complex algorithms and techniques, developed in house, surpassing other renderers in each category (unbiased and biased). Even more, the availability of these engines under the same framework, makes the transition between ultra high quality still images (typically using unbiased engine) and quality animations (typically using biased engine), completely transparent, since the materials and lighting stay the same and no "heuristic" conversion of any kind is required.