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Virtual Gonio-spectrophotometer

After collecting materials properties in the CGDB, the properties of complete window and shading systems can be simulated. This is the optimum solution because the properties of component materials can be measured more accurately than complete systems while the simulation allows a much more flexible and inexpensive way to characterize many permutations. Our virtual goniospectrometer or VGS is a Scheme macro that runs the ray tracing software TracePro ( a product of Lambda Research). It creates a segmented detector sphere around the system to be tested and counts the rays traversing each source/detector segment thus producing a BTDF/BRDF.
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