Description: Units are considered in base contact with a model on a round base if their Unit Boundaries are in contact.
Models are considered to be in base contact with a model on a round base if all of the following conditions are met:
• Their units are in base contact.
• The Unit Boundary of the model on a round base is directly in front of them.
• There aren't any models in between them.
See figure figure/round_base for an example.
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../pics/round_base.pdf_tex
Base contact between models and a model on round base.The models with a bold frame in unit B are considered to be in base contact with the model A on the round base, since this round base is directly in front of them.