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= Blender 2.78: Cycles =

== Spherical Stereo ==

Cycles now supports rendering spherical stereo images for VR. It includes support for pole merging to reduce artifacts when looking straight up or down. ({{GitCommit|de7a8af}}, {{GitCommit|cbe7f9d}})

[[File:Cycles_2.78_spherical_stereo.jpg|center|thumb|600px|Viewing Cycles spherical stereo renders on a VR device]]

== Multiple Scattering GGX ==

The glossy and glass BSDF nodes now have a Multiscatter GGX mode, which gives energy conserving results by simulating multiple scattering events within the microfacet layer. For rough metals and glass this solves excessive darkening.

[[File:Cycles_2.78_glossy_multiscatter_ggx.jpg|center|thumb|600px|Multiple scattering GGX]]

== Optimization ==

* Subsurface rays now using dedicated BVH, which optimized rendering time of those rays. ({{GitCommit|0e47e0c}})
* Make Spatial Split BVH build multi-threaded. ({{GitCommit|bf55afb}}, {{GitCommit|d7e4f92}})
* Optimized decoupled ray marching for heterogeneous volumes and transparent shadow rays. ({{GitCommit|7b356a8}})
* Support CPU groups on Windows, making it possible to use Cycles on machines with more than 64 logical processors ({{GitCommit|b62faa5}})
* Hair rendering will now use so-called unaligned BVH nodes which speeds up rendering up to 20% ({{GitCommit|4beae09}})
* This new BVH type can be disabled with "Use Hair BVH" option in Preferences panel to get 20% memory save on a hairy scenes ({{GitCommit|6cd675a}})
* Support visibility check in QBVH structure used by CPU. Gives up to 2x speedup in extreme render cases ({{GitCommit|1eacbf4}})
* More automatic node shader optimizations based on exploiting known constant node inputs. ({{GitCommit|f7bada0}}, {{GitCommit|ea2ebf7}}, {{GitCommit|1776f75}})

== GPU Rendering ==

* Support for NVidia GTX 1060, 1070, 1080 GPUs.
* Poor GPU rendering performance on NVidia GTX 980 Ti and Titan X has been solved ({{BugReport|45093}})
* CUDA rendering now uses less per-thread memory, reducing the base memory required to render an empty scene by about 50% ({{GitCommit|999d5a6}})
* OpenCL devices now support float4 textures (e.g. HDR textures). ({{GitCommit|76481ea}})
* CPU and CUDA (Geforce 6xx and above, see below) devices now support single float and byte textures, reducing memory for e.g. Smoke and Bumpmaps. ({{GitCommit|4a4f043b}}, {{GitCommit|3c85e1ca1}})
* CUDA devices (Geforce 6xx and above), now support Bindless Textures. This results in unlimited image textures on GPU (only limited by VRAM) and adds support for single channel textures. ({{GitCommit|c9f1ed1e}})

== Subdivision and Displacement ==

While still an experimental feature that is not officially supported and should be considered incomplete and subject to change, the subdivision and displacement system has been significantly improved.

[[File:Method.png|center|thumb|600px|Bump, Displacement and Both combined]]

* Subdivision is now adaptive so near and far objects automatically get more and less subdivisions respectively. ({{GitCommit|ebfdd7da}})
* Dicing rate is now a global option, with per-object dicing rate multipliers. ({{GitCommit|9f39619d}})
* Per object subdivision settings are now found in the subdivision surface modifier, while displacement settings are now part of the material.
* Many limitations have been fixed, to properly preserve attributes, fix cracks, excessive subdivision, and more.
* Both linear and Catmull-Clark subdivision with creases are supported.

[[File:Cycles_2.78_subdivision_creases.png|center|thumb|600px|Base mesh, Catmull-Clark, Catmull-Clark with creases]]

For more details on how to use this feature and the known limitations, see the [https://www.blender.org/manual/render/cycles/materials/displacement.html Displacement documentation in the manual].

== Various ==

* Resumable renders (samples offset) support. ({{GitCommit|f8b9f4e}})
* Smoke volume support for Velocity and Heat attributes. ({{GitCommit|951fad2}}, {{GitCommit|f951cc3}})
* Fluid simulation mesh support for motion blur and motion vectors ({{GitCommit|10b0e33d}})
* Vertex color, weight and normal support for point density textures ({{GitCommit|bdae64767081}})

[[File:Cycles.pd.vertexcolor.jpg|center|thumb|600px|Point density texture using vertex colours in Cycles (by BlenderDiplom.com)]]

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