Recently, Isotropix released Clarisse iFX 4.0 SP2. An important update is the addition of GPU-accelerated ray tracing to the 3D viewport. The Isotropix official said it is based on Nvidia's RTX technology, which can process VFX scenes containing hundreds of billions of polygons in real time.
The iconic feature in Service Pack 2 is GPU ray tracing: this is also the result of a three-year collaboration between Isotropix and Nvidia. Let's take a look at the video.

It is currently limited to 3D viewports, not final quality rendering, but only wireframes and simple shadow views do not support Clarisse's Previz or Progressive rendering mode.
Nvidia-based RTX technology, but works with older Nvidia GPUs. The system is based on RTX, a hardware implementation of Nvidia's DirectX 12 DirectX Ray Trace (DXR) API, available in the company's GeForce RTX, Titan RTX and Quadro RTX GPUs.
However, Isotropix says it can be accelerated on any Maxwell GPU or newer version.
The window can be set to GPU or CPU rendering, or it can be set to mixed mode. If the scene exceeds the available graphics memory on the GPU, the rendering will fall back to the CPU. Rollback is also used if the scene uses features that are not supported on the GPU (currently including rendering time shift and volume).
Other new features include improved sampling of importance in CPU rendering and "massive" improvements in the importance of lighting and material sampling on the mirror and transmission paths.
According to Isotropix, the current scene is "four times faster" than the previous Clarisse iFX version.

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