View Compilation Error

0_0_6729026_27489.cpp: In member function `TPoint T3dhull::gracen()':
0_0_6729026_27489.cpp:167: error: `hull' undeclared (first use this function)
0_0_6729026_27489.cpp:167: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6729026_27489.cpp: At global scope:
0_0_6729026_27489.cpp:178: error: `T3dhull hull' used prior to declaration