Photon Mapping (with Caustics)  

Irradiance Cache (similar to Irradiance Map and Final Gather)

Irradiance Point Cloud (similar to Importons and Light Cache)

You choose the techniques that work best for your particular scene.

Redshift uses an out-of-core architecture for geometry and textures, allowing you to render massive scenes that would otherwise never fit in video memory. A common problem with GPU renderers is that they are limited by the available VRAM on the video card – that is they can only render scenes where the geometry and/or textures fit entirely in video memory. This poses a problem for rendering large scenes with many millions of polygons and gigabytes of textures. With Redshift, you can render scenes with tens of millions of polygons and a virtually unlimited number of textures with off-the-shelf hardware.

Redshift supports geometry instancing allowing you to render massive scenes with large numbers of repeating objects, like grass or trees, efficiently with almost no memory overhead. Redshift also supports render proxies which allow you to place previously exported geometry in your scene but loading into memory only at render time when it is needed. With proxies, you can render scenes that would otherwise not even load in the host DCC application. Like regular geometry, Redshift proxies can be instanced, making rendering scenes with billions of instanced polygons possible

Redshift provides a progressive rendering mode that allows you to conveniently and interactively preview your scene without waiting for GI prepasses. This mode uses progressive refinement to give you draft quality results almost immediately while continuously refining the quality over time.

Redshift uses a flexible node-based shader system supporting complex shading networks. With support for surface, photon, environment, light and lens shaders, as well as a variety of BRDF lighting models, Redshift gives you the power and flexibility to achieve photorealistic results or highly stylized effects. When photorealism is your goal, Redshift provides physically correct surface shaders, physically correct lights, photometric (IES) lights, and a physical sun & sky system.