NVIDIA GameWorks Integration

[Blue_man]

@.;295413

Hello friends,

The VXGI branch (/tree/VXGI ) was updated just now with our new VXGI-0.9 release, including support for multi-bounce!

UE 4.7.5 + VXGI 0.9
Changes:
•Reduced shader compilation times for VXGI-enabled materials. We have measured a 4.6x speedup on the VXGI shader compilations in one of our tests.
•The material editor now sets “Used With VXGI Voxelization” to true by default (for the materials that are missing property). For VXGI voxelization to actually be enabled for a particular material, addition conditions currently need to be met: 1) the material domain must be MD_Surface, 2) the material cannot be a special engine material.
•Added experimental support for temporal reprojection for reducing flickering artifacts in the VXGI Diffuse Tracing output. is disabled by default and can be enabled by checking the “Temportal Reprojection Enabled” checkbox in the “VXGI Diffuse” section of the current PostProcessVolume. Temporal reprojection can be particularly useful to filter out flickering artifacts when performing quarter-resolution diffuse tracing (by setting VXGI Diffuse Tracing Sparsity to 4).
•Added experimental support for multi-bounce indirect illumination, by fetching VXGI irradiance output from the previous frame. To enable , one needs to have: 1) bVxgiMultiBounceSupport=true in an engine ini file (e.g. BaseEngine.ini), 2) the “r.VXGI.MultiBounceEnable” cvar must be set to 1 (and can be toggled at runtime). The r.VXGI.MultiBounceIrradianceScale cvar is a scale factor for the irradiance term from the previous frame. Ideally scale factor should be 1.0, but sometimes it makes the scene illumination blow up, so the default setting for cvar is lower to work around that.
•Added the bVxgiHighQualityEmittanceDownsampling engine ini option, to enable a higher-order filter for emittance downsampling. option is enabled by default and helps to avoid any popping artifacts when voxelizing emittance from moving lights.
•Renamed the bVxgiStoreEmittanceInFP16 engine ini option to bVxgiStoreEmittanceInHdrFormat. If bVxgiStoreEmittanceInHdrFormat is enabled, the engine uses FP16 precision for storing the voxelized emittance if FP16x4 atomics are supported by the GPU (which is the case for GM20X), and FP32 precision otherwise. If bVxgiStoreEmittanceInHdrFormat is disabled, the engine stores emittance in a RGBA8 texture.
•Added VXGI support for unlit emissive materials.
•The VXGI version number is now reported in the Launcher and About popup windows of the editor.

Thank you for reduced shader compilatio time.