float STLVolume()
{
float vols = 0;
for (int i = 0; i < Tmesh->faces.size(); i++)
{
vec p1 = Tmesh->vertices[Tmesh->faces[i][0]];
vec p2 = Tmesh->vertices[Tmesh->faces[i][1]];
vec p3 = Tmesh->vertices[Tmesh->faces[i][2]];
float v321 = p3[0] * p2[1] * p1[2];
float v231 = p2[0] * p3[1] * p1[2];
float v312 = p3[0] * p1[1] * p2[2];
float v132 = p1[0] * p3[1] * p2[2];
float v213 = p2[0] * p1[1] * p3[2];
float v123 = p1[0] * p2[1] * p3[2];
vols +=(1.0f / 6.0f)*(-v321 + v231 + v312 - v132 - v213 + v123);
}
return abs(vols);
}
参考论文：EFFICIENT FEATURE EXTRACTION FOR 2D/3D OBJECTS IN MESH REPRESENTATION
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