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Evalglare Tutorial#

A quick and dirty tutorial to run a simple evalglare analysis.

  1. Make sure you have a running setup of Ignis. Have a look at Building to understand how to compile the Ignis framework.

  2. Build your own scene using one of the available tools.

    1. We will use the scene/radiance/office/office_scene.json example.

  3. Apply source source.sh or run source.bat or source.ps1 depending on your operating system to make sure the tools are available in the current shell environment.

  4. Run igview SCENE_FILE --camera fishlens to check out your scene. The SCENE_FILE parameter is the path to your preferred scene file.

  5. Look around and find a good spot. In the best case, it is an interesting spot for the analysis of the glare probability.

    1. Note down the Cam Eye, Cam Dir and Cam Up somewhere. These observables are located on the Stats panel.

    2. You can create a new view file output.vf based on the following template rvu -vta -vp Px Py Pz -vd Dx Dy Dz -vu Ux Uy Uz -vh 180 -vv 180 -vo 0 -va 0 -vs 0 -vl 0 with P, D and U being the previously noted coordinates.

  6. Run igcli SCENE_FILE --spp SPP --camera fishlens -o output.exr. Setting SPP to a high value will make the image less noisy, but will also take longer to finish. The higher the SPP the greater the coffee you may consume. For example, igcli scene/radiance/office/office_scene.json --spp 512 --camera fishlens -o output.exr

  7. Run exr2hdr output.exr to convert the modern OpenEXR file to Radiance hdr file. This will create a new output.hdr file.

  8. Finally, run evalglare -vf output.vf -d from the Radiance tools.

    1. This will output the DGP and many other measures. Have a look at the evalglare manual to understand them.

Note

You can use the python script scripts/ExtractRadView.py to generate a radiance view file for you directly from the settings inside the scene description.