{
    tree: { Here: {                                     // Adaptive-tree settings specified here:
        tar_tris: 5,                                    // Target num triangles per leaf cell.
        max_depth: 8,                                   // (ignore) Maximum tree splitting depth.
        padding: 0.01,                                  // (ignore) Fraction to increase leaf cells.
    }},
    grid    : { There: 'grid/10m_64.json5' },           // Use the grid settings from this file.
    sett    : { Here: {                                 // Use these sim settings.
        block_size      : 100,                          // Number of cells to compute in one thread block.
        bump_dist       : 1.0e-4,                       // Distance to bump rays past collision event.
        super_sampling  : { "Uniform"   : [2,2,2] },    // Super-sampling options.
        caster          : { "Radiant"   : 10001 },      // Sampling mode and settings.
    } },
    surfs   : { There: 'scenes/surfs.json5' },          // Use the scene surface setup from this file.
    inters  : { There: 'scenes/inters.json5' },         // Use the scene interface setup from this file.
    engine  : "Basic",                                  //  Engine choice.
}