For JSBSim Movement, how to edit the “Structural Frame Origin” property so that it matches with the 3D model geometry you used.

Development Programming & Scripting Blueprint
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I feel so confused about that,I want to use c130 plane,but don’t know how to calculate them.

for example,in 787-8 plane ,Structural Frame Origin” is（-49.422097，0，355.5）,and Nose Gear Contact Point is -809.50058 0.00 -143.36872 ,I can’t see any relationship between the two numbers，can anyone tell me how to solve this please