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Radiosity is very smooth across most patches. Use adaptive refinement to only subdivide where form factors change. Problem: Subdivision leads to complexity since each patch can interact with each other one.

Solution: Allow interactions across subdivision levels.

Adaptive Refinement
Idea: where form factors are large, subdivide the larger patch

refine(, ):
    if ( && )
        link(, )
    else if ()
        if (subdivide() > )
            refine(, )
            refine(, )
            refine(, )
            refine(, )
        else
            link(, )
    else
        if (subdivide() > )
            refine(, )
            refine(, )
            refine(, )
            refine(, )
        else
            link(, )

Solution
Alternatingly, apply to all unsubdivided patches

• Gathering Step
• Push-Pull Step

Gather
gather():
    .in
    for (all links )
        .in .in + .out
    gather()
    gather()
    gather()
    gather()

Push-Pull
pushpull()
    if ( has children)
        push
        in in .in
        in in .in
        in in .in
        in in .in
        recurse
        pushpull()
        pushpull()
        pushpull()
        pushpull()
        pull
       
    else
        convert incoming to outgoing radiance
        in