Does not seem much but I got rid of the light leaking. Following was done:

- meshes (walls, archs, windows) inc files through Poseray export as obj 
files (weld vertices and recalculate normals);

- in Silo: giving thickness to the walls with the Shell utility (this 
probably exists also in Blender?);

- in Silo: closing of the arch object and extending it a little bit 
above the ceiling;

- in Silo: lowering the sky-windows which were /floating/ just above the 
building letting light leak in-between;

- saving the different objects as obj files and through Poseray export 
to POV as mesh2 files (recalculate normals);

- in the POV scene: replace the mesh{} objects by the mesh2{} ones;

Everything seems now to be in place to tackle the photons and caustics.

Thomas

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