double GLC_Mesh::volume()
{
double resultVolume= 0.0;
if (!m_MeshData.isEmpty())
{
IndexList triangleIndex;
QList<GLC_Material*> materials= materialSet().toList();
const int materialsCount= materials.count();
for (int i= 0; i < materialsCount; ++i)
{
GLC_uint materialId= materials.at(i)->id();
if (containsTriangles(0, materialId))
{
triangleIndex.append(getTrianglesIndex(0, materialId).toList());
}
if (containsStrips(0, materialId))
{
triangleIndex.append(equivalentTrianglesIndexOfstripsIndex(0, materialId));
}
if (containsFans(0, materialId))
{
triangleIndex.append(equivalentTrianglesIndexOfFansIndex(0, materialId));
}
}
GLfloatVector vertices= m_MeshData.positionVector();
Q_ASSERT((triangleIndex.count() % 3) == 0);
const int triangleCount= triangleIndex.count() / 3;
for (int i= 0; i < triangleCount; ++i)
{
const int index= i * 3;
const double v1x= vertices.at(triangleIndex.at(index) * 3);
const double v1y= vertices.at(triangleIndex.at(index) * 3 + 1);
const double v1z= vertices.at(triangleIndex.at(index) * 3 + 2);
const double v2x= vertices.at(triangleIndex.at(index + 1) * 3);
const double v2y= vertices.at(triangleIndex.at(index + 1) * 3 + 1);
const double v2z= vertices.at(triangleIndex.at(index + 1) * 3 + 2);
const double v3x= vertices.at(triangleIndex.at(index + 2) * 3);
const double v3y= vertices.at(triangleIndex.at(index + 2) * 3 + 1);
const double v3z= vertices.at(triangleIndex.at(index + 2) * 3 + 2);
resultVolume+= ((v2y - v1y) * (v3z - v1z) - (v2z - v1z) * (v3y - v1y)) * (v1x + v2x + v3x);
}
resultVolume= resultVolume / 6.0;
}
return resultVolume;
}
IndexList GLC_Mesh::getEquivalentTrianglesStripsFansIndex(int lod, GLC_uint materialId)
{
IndexList subject;
if (containsTriangles(lod, materialId))
{
subject= getTrianglesIndex(lod, materialId).toList();
}
if (containsStrips(lod, materialId))
{
subject.append(equivalentTrianglesIndexOfstripsIndex(lod, materialId));
}
if (containsFans(lod, materialId))
{
subject.append(equivalentTrianglesIndexOfFansIndex(lod, materialId));
}
Q_ASSERT((subject.count() % 3) == 0);
return subject;
}
