Update Changelog.md

Author: bsavery

Changelog.md

@@ -1,3 +1,48 @@
+# Version 2.5.1
+
+## New Features
+-   **Beta support for RPR 2.0 and the capability of using it for Viewport Rendering has been added.  This also gives better support for Point and Spot light softness parameters.  For equivalent sample counts, in most scenes, the noise should be lower, and scaling of render speeds across multiple devices should be better.**
+-   The ML Denoising filter speed has been improved.
+-   The viewport shading panel has been added in the viewport render mode.
+-   Support for “Multiply Add” in the Math node has been added (thanks to user cmdrf for their contribution).
+-   Support for muting nodes with the “M” key in the shader editor has been added.
+-   Support for the Local mode with the “/” key in the viewport has been added.
+-   The Object Info node is now supported in the Full mode.
+-   The default adaptive tile size has been increased to 32 for adaptive rendering, which gives better results when rendering with multiple GPUs.
+A new setting in Viewport Sampling called “Samples per second” has been added, with the default being 15. This setting is roughly analogous to “Frames per second”. The viewport render resolution is adjusted during rendering to try and maintain this interactivity. There is also a “Minimum viewport resolution” setting which limits resolution downscaling. For users with high resolution displays, this adaptive resolution can maintain a much better viewport experience.
+-   Support of image sequences of textures and sequences of animated OpenVDB files has been added.
+-   Final rendering no longer uses the setting “Update samples”.  Renders are exponentially updated after 1, 1, 2, 4, 8, 16, 32, and every 32 samples thereafter.  This is done to maximize performance, especially with RPR 2.0.  Viewport rendering is unchanged.
+-   For users interested in testing the latest developments in the Radeon ProRender for Blender plugin, a weekly “Development Build” will be posted on future Mondays. See https://github.com/GPUOpen-LibrariesAndSDKs/RadeonProRenderBlenderAddon/releases or follow the repository on github to get weekly updates.
+
+## Fixed Issues
+-   The Physical Light normalization  now takes transform scaling into account.
+-   Export of .rpr files now uses the scene camera property.
+-   Backplate images now work in viewport renders.
+-   An issue with image texture gamma correction in Hybrid modes has been fixed.
+-   Pixel filter settings are now exported to .rpr files.
+-   CPU rendering is now selectable in the UI with RPR 2.0 enabled.
+-   Rendering animations can no longer cause a memory leak and eventual crash.
+-   Export of .rpr files should no longer be slow with many textures in Blender 2.83.
+-   Scene sync and render times are now logged to the console.
+-   AOV names in the config.json file exported with .rpr are no longer different from expected names.
+-   When using collections of objects with the same name there could be a name duplication leading to some objects not being rendered — fixed.
+-   Sometimes switching from the Object to the Edit mode in the viewport could result in the loss of an object’s UV coordinates — fixed.
+-   Mapping node transformations were off, in particular, combinations of transforms and rotations only took Z into account — fixed.
+-   “Generated” UV in the Texture Coordinate mode is now correct.
+-   The scale wrap, sin, cos and tan functions in the vector math node are now not supported.
+-   Exporting .rpr files to directories with non-latin characters is now supported
+-   Fixed artifacts while using the denoiser with tiled rendering
+-   Light Group AOVs and ID’s now use 1-4 instead of selecting a “key” or “fill” light group.
+
+## Known Issues
+-   macOS ML denoiser may have issues (driver issue being investigated)
+-   RPR 2.0 known issues
+    - Shadow and reflection catchers are not yet enabled
+    - Adaptive sampling is disabled
+    - Adaptive subdivision is disabled
+    - On macOS, currently RPR 2.0 uses OpenCL and not metal.
+
+
 # Version 2.4.11
 
 ## NEW FEATURES:
@@ -76,4 +121,4 @@
 
 -   Viewport rendering with RPR 2.0 falls back to use RPR 1.0.
 
--   Invisible area lights can cause firefly artifacts in RPR 2.0.
+-   Invisible area lights can cause firefly artifacts in RPR 2.0.