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## Vertical Calculation Planes

Will a vertical plane located at the mid point of a space (not along a wall) with points facing one direction block light coming from the opposite direction that the points are receiving from?

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Calculation planes do not block light transfer between surfaces (or the sun/sky/ground).  However, calculation planes do occlude each other.

This is an unfortunate technical limitation that makes it impossible to get accurate calculation results in these cases:

• Multiple horizontal calculation planes in the same space (i.e. workplane, floor).
• Multiple vertical calculation planes in the same space.
• Intersecting calculation planes (e.g. horiztonal and vertical in the same space).

Guidelines:
• If evaluating the workplane, only create calculation planes on the workplane which do not intersect one another.
• Make all the calculation planes coincident with surfaces.  When this is true any occlusion between the calculation planes is irrelevant because the surfaces would occlude the light anyway. 