protected bool BuildTangentForMeshObjects(NullMeshObjects meshObjects, float thresHold, bool forceSmooth = false)
{
if (meshObjects == null || meshObjects.GetMeshObjectCount() == 0)
{
return(false);
}
int triangleCount = meshObjects.GetTriangleCount();
if (triangleCount > 0)
{
//preparing data
List <Vector3> vertices = new List <Vector3>();
List <Vector2> uvs = new List <Vector2>();
List <Vector3> tangents = Make <Vector3>(triangleCount * 3);
List <Vector3> binormals = Make <Vector3>(triangleCount * 3);
List <byte> smoothGroups = Make <byte>(triangleCount);
int realTriangleCount = 0;
for (int i = 0; i < meshObjects.GetMeshObjectCount(); i++)
{
NullMeshObject meshObject = meshObjects[i];
if (meshObject.GetUVGroups().Count == 0 || meshObject.GetNormalData().Count == 0)
{
continue;
}
int count = meshObject.GetTriangleCount();
vertices.AddRange(meshObject.GetVertexData());
byte smoothGroup = meshObject.GetSmoothGroup();
if (forceSmooth && smoothGroup == 0)
{
smoothGroup = 1;
}
Set(smoothGroups, smoothGroup);
NullUVGroup uvGroup = meshObject.GetUVGroup(UVType.UVT_NORMAL_MAP);
if (uvGroup == null)
{
uvGroup = meshObject.GetUVGroup(UVType.UVT_DEFAULT);
}
uvs.AddRange(uvGroup.GetUVData());
realTriangleCount += count;
}
//do face-smoothing
ComputeTengents(thresHold, vertices, realTriangleCount, smoothGroups, uvs, tangents, binormals);
//update mesh objects normals
for (int i = 0; i < meshObjects.GetMeshObjectCount(); i++)
{
NullMeshObject meshObject = meshObjects[i];
if (meshObject.GetUVGroups().Count == 0 || meshObject.GetNormalData().Count == 0)
{
continue;
}
meshObject.BuildTangentArray();
int count = meshObject.GetTriangleCount();
for (int j = 0; j < count; j++)
{
//set tangent
meshObject.SetTangent(j * 3 + 0, tangents[j * 3]);
meshObject.SetTangent(j * 3 + 1, tangents[j * 3 + 1]);
meshObject.SetTangent(j * 3 + 2, tangents[j * 3 + 2]);
//set binormal
meshObject.SetBinormal(j * 3 + 0, binormals[j * 3]);
meshObject.SetBinormal(j * 3 + 1, binormals[j * 3 + 1]);
meshObject.SetBinormal(j * 3 + 2, binormals[j * 3 + 2]);
}
}
//delete temp buffer
vertices.Clear();
tangents.Clear();
binormals.Clear();
uvs.Clear();
smoothGroups.Clear();
}
return(true);
}
