Using Rhino V5 SR14 32bit, I am also getting a negative volume from a closed mesh object. The report from the check command tells me it is a good mesh (see below). The above “neg-vol.3dm” file provided by pickedgator also gives me a negative “Volume = -2618.04332 (+/- 3.1e+06) cubic millimeters”. Please help.
This is a good mesh.
General information about this mesh:
Mesh does not have any degenerate faces.
Mesh does not have any extremely short edges.
Mesh does not have any non manifold edges.
Mesh does not have any naked edges.
Mesh does not have any duplicate faces.
Mesh does not have any faces with directions different from the mesh as a whole.
Mesh does not have any self intersecting faces.
Mesh does not have any disjoint pieces.
Mesh has 1 unused vertex.
ID: 7eb9a244-87d7-4c5e-8084-c3b288cf68fe (24)
Layer name: Default
source = from layer
index = -1
Closed polygon mesh: 33166 vertices, 65870 polygons with normals
bounding box: (3.56886,3.27622,0.315109) to (5.39983,6.13502,7.3109)
UserData ID: 3B7FB506-437C-431e-B1D7-93C4CBFF417F
description: Gumball grip frame
saved in file: yes
copy count: 7