/// <summary>
/// Given a base mesh, the face classifications for all faces in the mesh, and a single face classification to
/// extract, extract into a new mesh only the faces that have the selected face classification.
/// </summary>
/// <param name="baseMesh">The original base mesh.</param>
/// <param name="faceClassifications">The array of face classifications for each triangle in the
/// <paramref name="baseMesh"/></param>
/// <param name="selectedMeshClassification">A single classification to extract the faces from the
/// <paramref="baseMesh"/>into the <paramref name="classifiedMesh"/></param>
/// <param name="classifiedMesh">The output mesh to be updated with the extracted mesh.</param>
void ExtractClassifiedMesh(Mesh baseMesh, NativeArray <ARMeshClassification> faceClassifications, ARMeshClassification selectedMeshClassification, Mesh classifiedMesh)
{
// Count the number of faces matching the selected classification.
int classifiedFaceCount = 0;
for (int i = 0; i < faceClassifications.Length; ++i)
{
if (faceClassifications[i] == selectedMeshClassification)
{
++classifiedFaceCount;
}
}
// Clear the existing mesh.
classifiedMesh.Clear();
// If there were matching face classifications, build a new mesh from the base mesh.
if (classifiedFaceCount > 0)
{
baseMesh.GetTriangles(m_BaseTriangles, 0);
Debug.Assert(m_BaseTriangles.Count == (faceClassifications.Length * 3),
"unexpected mismatch between triangle count and face classification count");
m_ClassifiedTriangles.Clear();
m_ClassifiedTriangles.Capacity = classifiedFaceCount * 3;
for (int i = 0; i < faceClassifications.Length; ++i)
{
if (faceClassifications[i] == selectedMeshClassification)
{
int baseTriangleIndex = i * 3;
m_ClassifiedTriangles.Add(m_BaseTriangles[baseTriangleIndex + 0]);
m_ClassifiedTriangles.Add(m_BaseTriangles[baseTriangleIndex + 1]);
m_ClassifiedTriangles.Add(m_BaseTriangles[baseTriangleIndex + 2]);
}
}
classifiedMesh.vertices = baseMesh.vertices;
classifiedMesh.normals = baseMesh.normals;
classifiedMesh.SetTriangles(m_ClassifiedTriangles, 0);
}
}
/// <summary>
/// Given a base mesh, the face classifications for all faces in the mesh, and a single face classification to
/// extract, extract into a new mesh only the faces that have the selected face classification.
/// </summary>
/// <param name="baseMesh">The original base mesh.</param>
/// <param name="faceClassifications">The array of face classifications for each triangle in the
/// <paramref name="baseMesh"/></param>
/// <param name="selectedMeshClassification">A single classification to extract the faces from the
/// <paramref="baseMesh"/>into the <paramref name="classifiedMesh"/></param>
/// <param name="classifiedMesh">The output mesh to be updated with the extracted mesh.</param>
void ExtractClassifiedMesh(Mesh baseMesh, List <ARMeshClassification> faceClassifications, ARMeshClassification selectedMeshClassification, Mesh classifiedMesh)
{
// Count the number of faces matching the selected classification.
int classifiedFaceCount = 0;
foreach (var faceClassification in faceClassifications)
{
if (faceClassification == selectedMeshClassification)
{
++classifiedFaceCount;
}
}
classifiedMesh.Clear();
if (classifiedFaceCount <= 0)
{
return;
}
baseMesh.GetTriangles(m_BaseTriangles, 0);
Debug.Assert(m_BaseTriangles.Count == (faceClassifications.Count * 3),
"unexpected mismatch between triangle count and face classification count");
m_ClassifiedTriangles.Clear();
m_ClassifiedTriangles.Capacity = classifiedFaceCount * 3;
for (int i = 0; i < faceClassifications.Count(); ++i)
{
if (faceClassifications[i] != selectedMeshClassification)
{
continue;
}
int baseTriangleIndex = i * 3;
m_ClassifiedTriangles.Add(m_BaseTriangles[baseTriangleIndex + 0]);
m_ClassifiedTriangles.Add(m_BaseTriangles[baseTriangleIndex + 1]);
m_ClassifiedTriangles.Add(m_BaseTriangles[baseTriangleIndex + 2]);
}
classifiedMesh.vertices = baseMesh.vertices;
classifiedMesh.normals = baseMesh.normals;
classifiedMesh.SetTriangles(m_ClassifiedTriangles, 0);
}
