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How is EEVEE so fast?
Eevee uses rasterization via OpenGL 3.3, which is why it can be blazing fast in comparison to other types of rendering. The key thing to remember is that this speed comes at the cost of accuracy because it is working with pixel information (i.e. a compressed view of the scene) instead of paths of light.
What kind of renderer is EEVEE?
EEVEE is the new physically-based rendering engine added to Blender starting with version 2.80. A GPU-only engine based on OpenGL, EEVEE is intended to be a real-time render engine with advanced features (volumetrics, subsurface scattering, ambient occlusion, motion blur and more).
Why is EEVEE render so slow?
And the reason that eevee renders slowly (or at least not instantly) is because it still takes multiple samples for a final render. It is only real time in the viewport because it takes a fewer number of samples. Adjusting settings in eevee can optimize it in the same way that adjusting cycles settings can optimize it.
Why is Eevee not a ray tracing engine?
Eevee is not a ray tracing engine and cannot do ray-triangle intersection. Instead of this, Eevee uses the depth buffer as an approximated scene representation. This reduces the complexity of scene scale effects and enables a higher performance. However, only what is in inside the view can be considered when computing these effects.
Can you use Eevee on a headless system?
CPU power is still needed to handle high scene complexity as the geometry must be prepared by the CPU before rendering each frame. There is currently no support for multiple GPU systems. There is currently no support for using Eevee on headless systems (i.e. without a Display Manager).
Can you play Eevee in Unreal Engine 4?
For offline Eevee rendering (i.e., playblast) we can crank that up and raise the bar. Things are lit and well, but we still need materials to respond to it. We will implement the concept of Uber shaders following the Unreal Engine 4 PBR materials.
Why does Eevee only use the GPU to render?
There is no standard way of estimating if the resources will fit into the GPU memory and/or if the GPU will render them successfully. Being a rasterization engine, Eevee only uses the power of the GPU to render. There is no plan to support CPU (software) rendering as it would be very inefficient.