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Compile Mitsuba

fakephysicist   
         

In this post, I will show you how to compile Mitsuba from source code.

Follow the instructions in the documentation to compile the project.

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git clone --recursive https://github.com/mitsuba-renderer/mitsuba3

Switch to the most recent version of the repository. For example, if the current version is v3.5.2, switch to tag v3.5.3:

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git checkout v3.5.3

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git submodule update --init --recursive

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mkdir build
cd build
cmake -GNinja ..

This should generate a build directory with a mitsuba.conf file. You should set the variants you want to compile in this file.

For example, to compile the scalar_rgb, scalar_spectral, scalar_spectral_polarized, llvm_spectral, llvm_spectral_polarized, and llvm_ad_rgb variants, the mitsuba.conf file should look like this:

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"enabled": [
    "scalar_rgb", "scalar_spectral", "scalar_spectral_polarized", "llvm_spectral", "llvm_spectral_polarized", "llvm_ad_rgb"
],

Then, compile the project:

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ninja

To call the compiled version of Mitsuba in python or Jupyter, add the path of the compiled python module to the python path. For example, if the path to the compiled python module is /Users/your_username/mitsuba3/build/python, you can add this path to the python path by running the following code:

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import sys
sys.path.insert(0, '/Users/your_username/mitsuba3/build/python')

This can work only temporarily. If you quit the python session, or restart the Jupyter kernel, you will have to run this code again.

Then, you can then import Mitsuba as usual:

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import drjit as dr
import mitsuba as mi

To check if the correct version of Mitsuba is being used, you can run the following code:

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mi.variants()
mi.set_variant('llvm_spectral_polarized')
print(mi.MI_VERSION)

This code will print the available variants and the version of Mitsuba being used. Also, it tests if the variant llvm_spectral_polarized is available.

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