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HdCycles for Houdini Linux installation instructions

If you wish to test it, here I created the repo https://github.com/bareya/hdcycles_for_houdini. There are some requirements to build it:

• git
• cmake-3.18+
• gcc-6
• patch command installed
• houdini-18.5.519+

To build it we have to clone the repo, and pass the compiler with install directory to the building system. I assumed Houdini on Linux is install under /opt/hfs18.5 and it is at least 18.5.519 build. If you wish to modify it, please make a PR!

git clone https://github.com/bareya/hdcycles_for_houdini
cd hdcycles_for_houdini
mkdir build && cd build
cmake .. -DCMAKE_INSTALL_PREFIX=/tmp/build -DCMAKE_CXX_COMPILER=g++-6 -DCMAKE_C_COMPILER=gcc-6 && make

After building is done we have to export environment variables, for Hydra to find the plugin:

export PXR_PLUGINPATH_NAME=/tmp/build/plugin/usd/hdCycles/resources/:/tmp/build/plugin/usd/ndrCycles/resources/:${PXR_PLUGINPATH_NAME}

In Stage context you can find Cycles as a new Hydra delegate.