Return the child position (0..3) of this cell's ancestor at the given level within its parent. For example, child_position(1) returns the position of this cell's level-1 ancestor within its top-level face cell. REQUIRES: 1 <= level <= this->level().
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Return the child position (0..3) of this cell's ancestor at the given level within its parent. For example, child_position(1) returns the position of this cell's level-1 ancestor within its top-level face cell. REQUIRES: 1 <= level <= this->level().