Radiosity Stopping Criterion - Procedures

The Radiosity Stopping Criterion dialog specifies the Stopping Criterion parameters used for daylighting and non-daylighting calculations in Full Radiosity Method. When the Calculate command is initialized, these settings will determine calculation length and accuracy. This dialog provides access to preset recommended Stopping Criterion as well as the option to enter your own criterion.

From the Control Bar select the small black arrow next to the Calculate button. To change the Stopping Criterion, choose the following option from the Calculate secondary menu: Radiosity Stopping Criterion.

Changing the Radiosity Stopping Criterion does not reinitialize the mesh settings (surface mesh in Render mode continues to show previous settings until the environment is recalculated).

Accuracy Presets

Three Accuracy Preset Stopping Criterion Levels are available - High (default), Medium and Low.

Accuracy Preset	Stopping Criterion (% Light Absorbed)	Comment
High	99	The finest level applied; default for all calculations. Necessary when the highest level of accuracy is expected; calculation time is also longest. Recommended for these applications: Daylighting Emergency / Egress Close proximity between luminaire and surface (coves, facade lighting, indirect applications
Medium	95	Appropriate for most interior electric lighting applications, except as noted above.
Low	90	Appropriate for most exterior electric lighting applications.

Stopping Criterion (% Light Absorbed) – The Stopping Criterion indicates the amount of unabsorbed light that can remain in the environment before the Radiosity calculations are stopped. Simply, each time the light bounces around in the environment, less light remains unabsorbed. The Radiosity calculations are repeated until the stopping criterion has been met. The default Stopping Criterion is 99%.

Values between 0% and 99.99% are allowed, however, values below 90% are not recommended unless you are doing preliminary or non-production grade calculations.

Reset Default- Resets to the factory provided setting.

Save As Default - Saves setting as default for all new files.