typedef struct
    {
    PK_TOPOL_t              target;         --- Face or Body (aka 'A')
    int                     target_index;   --- Index of owner in input
    PK_TOPOL_t              tool;           --- Face or Body ('B')
    int                     tool_index;     --- Index of owner in input
    PK_TOPOL_clash_type_t   clash_type;     --- Type of clash being reported
    }
    PK_TOPOL_clash_t;




Describes a clash: clashing entities and type of clash


Target is an entity from the targets input, Tool is an entity from the
tools input, clash_type is a PK_TOPOL_clash_type_t describing the clash.