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This hardware-agnostic rendering plug-in for Blender uses accurate ray-tracing technology to produce images and animations of your scenes, and provides real-time interactive rendering and continuous adjustment of effects.


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Radeon ProRender Blender Addon

Build Requirements


  • Blender 4.1+
  • Python 3.11 (Blender 4.1 uses 3.11) x64(for Core) - all code, addon and misc tested with python3
  • python-cffi
    • py -3.11 -m pip install cffi
    • py -3.11 -m pip install numpy
  • Visual Studio 2015 SP3 / 2017 / 2019 with SDK 8.1 and 2015.3 v140 toolset installed
  • If you are using Visual studio 2019 you would need to install the Windows SDK 8.1 manually from Microsoft website
  • cmake 3.x. Make sure it's added to the PATH environment variable

Note that the .sln provided is for easy editing and searching of files on Windows. The blender code builds on the command line rather than in the solution file. Visual Studio does provided support for debugging Python when you attach to the running Blender process with loaded addon.

ThirdParty libraries

There is ThirdParty repository included to the project as a submodule. Please update submodules:

Plugin includes 4 submodules: RadeonProRender SDK:

Shared components Image Processing Library:

ThirdParty components and miscellaneous tools

All of them are included via SSH protocol. You will need to create and install SSH keys

Once SSH keys are installed update/checkout submodules for active branch

git submodule update --init -f --recursive


Coding Conventions

Aim is to conform to pep8. At minimum it's 4 spaces for indentation, sources are utf-8, there's .gitconfig in the root of the project - please set you editor to use it(for most simplicity). E.g. PyCharm(recommended!) default setting are fine and seems that it also picks up .editorconfig automatically also, Tortoise Merge has a checkbox 'Enable EditorConfig', for Visual Studio there's EditorConfig extension

Git - we try to avoid merge commits, easiest way to do it:

git config [--global] merge.ff only # this one rejects merges that would result in merge commit

git config [--global] pull.rebase true # converts pull to do, essentially, fetch&rebase

Also, make more meaningful commits(one commit per feature) the easy way:

git merge <branch> --squash # this will create a single change set from multiple commits coming from

Recommended software

  • PyCharm Community Edition - very recommended, possible to enable intellisense(limited) for Blender code and for RPR Core
  • Visual Studio - has a very nice python extension, possible to enable intellisense for Blender and for RPR Core, provides remote debugging in Blender


run to build.

Run Addon while developing it(without real installation)

  • make sure you have no installed addon for Blender version you want to use; remove installed version if needed.
  • set environment variable BLENDER_EXE to blender.exe you want to use via the command line or system environment settings.
  • run run_blender_with_rpr.cmd


set BLENDER_EXE="C:\Program Files\Blender Foundation\Blender 2.93\blender.exe" && run_blender_with_rpr.cmd



Using python's 'logging' module underneath, rprblender.utils.logging has functions similar to logging. It also includes callable class Log which provides simplified interface to do logging. Example: from rprblender.utils import logging log = logging.Log(tag='export.mesh')

log("sync", mesh, obj)

e.g. logging.debug(*argv, tag) where argv is what is printed(same as with print) and tag is string suffix for logger name, for filtering so that logging.limit_log(name, level_show_always) will allow to filter out what doesn't start with name(expect levels equal or above level_show_always) very early) can be used to include code like limit_log to configure your session

from .utils import logging
logging.limit_log('default', logging.DEBUG)

from . import config
config.pyrpr_log_calls = True #  log all Core function calls to console, can be VERY useful
  • Visual Studio has really nice(and working) mixed(python and C stack) debugging - recommended!
  • Blender debug - it's easiest to build Blender in Release or RelWithDebInfo(and add #pragma optimize( "", off ))
  • Debug in PyCharm - import pydevd; pydevd.settrace('localhost', port=52128, stdoutToServer=True, stderrToServer=True, suspend=False)

Making a new release

  • run <build_folder>. Where build_folder is some separate location - it will clone needed repos(if not already), reset then to needed branch and build installer. Byt default it builds windows installer on master.
  • tag the commit in the build folder's ProRenderBlenderPlugin git tag builds/x.y.zz
  • push the tag git push --tags
  • increase version in src/rprblender/


Blender api intellisense support

Get pycharm-blender. See instructions on the github page or, in short, run from Blender itself or using command line, e.g. blender --python, add "pypredef" folder path that this script creates to you PyCharm Interpreter paths, find paths settings under File | Settings(or Default Settings) | Project Interpreter

Increase max file size for Pycharm intellisence( generated is huge), go to Help | Edit Custom VM Options and add the following line:


Restart PyCharm

Visual Studio

Create and configure RPRBlender python project

Install python extension in Visual Studio

Create new project from existing python code: Menu -> File -> New -> Project -> Python tab -> From Existing Python Code

Add following Search Paths to project:

  • rprblender\support
  • <path to Blender 2.93>\2.93\scripts\modules # path where to Blender's modules
  • <path to "PyCharm->Blender api intellisense support">

Configure VS remote debugger to Blender

Install Blender-VScode-Debugger addon

Get Blender-VScode-Debugger plugin for Blender from

Install plugin in Blender: Menu -> File -> User Preferences -> Click "Install Add-on from file" -> Select -> Click "Install Add-on from file". New adddon "Development: Debugger for Visual Code" should be appeared

Enable "Development: Debugger for Visual Code" addon. Select "Path to PTVSD module": C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE\Extensions\Microsoft\Python Tools for Visual Studio\2.2\

Click "Save User Settings"

Attach VS remote debugger to Blender

In Blender: press -> in appeared dialog type "debug" -> select "Connect to Visual Studio Code Debugger"

In VS: Menu -> Debug -> Attach To Process -> select Transport "Python remote (ptvsd)" -> type in Qualifier "my_secret@localhost:3000" -> click Refresh: process Blender.exe "tcp://localhost:3000" should be appeared -> select process -> click Attach

Remote debugging connection established.


The version number should be updated when a new plugin is released. This is done by editing the version field of the bl_info structure in the src/rprblender/ file. Currently a build script will update the build number when checkins happen to the master branch. So it is only necessary to update the major or minor number when required.


This hardware-agnostic rendering plug-in for Blender uses accurate ray-tracing technology to produce images and animations of your scenes, and provides real-time interactive rendering and continuous adjustment of effects.








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