Negative volume

I have created a brep by using railrevolve. It has a negative volume.
Does it mean that the surface vectors are in a wrong ditection? How can I fix this?
neg.gh (8.0 KB) negative

Try to relocate your geometry near the origin point and calculate the volume again.

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Does location of the geometry matters for the calculation of volume ?

Negative volume usually means the surface normals point into the volume.

Usually only if the object is a very large distance fromt the world origin. Your object does not appear to be that far away.

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Depending on the direction of the curves, the volume might be negative.

21_03_21_rail_revolution_curve_direction.gh (12.0 KB)

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