Mesh GetOrCreateInstance(FbxMesh fbxMesh)
{
Mesh mesh;
if (m_meshInstances.TryGetValue(fbxMesh, out mesh))
{
return(mesh);
}
// create the unity mesh vertices
var nVertices = fbxMesh.GetControlPointsCount();
var unityVertices = new Vector3[nVertices];
for (int i = 0; i < nVertices; ++i)
{
unityVertices[i] = V3(fbxMesh.GetControlPointAt(i));
}
// create the unity mesh triangles. TODO: maybe handle non-triangular faces more intelligently
var nPoly = fbxMesh.GetPolygonCount();
var unityTriangles = new List <int>();
for (int polyIndex = 0; polyIndex < nPoly; ++polyIndex)
{
var polySize = fbxMesh.GetPolygonSize(polyIndex);
if (polySize < 3)
{
// ignore lines and points
continue;
}
// Add the first triangle
unityTriangles.Add(fbxMesh.GetPolygonVertex(polyIndex, 0));
unityTriangles.Add(fbxMesh.GetPolygonVertex(polyIndex, 1));
unityTriangles.Add(fbxMesh.GetPolygonVertex(polyIndex, 2));
// If there's more triangles, assume they're a fan around the first vertex.
// Not necessarily true, but them's the breaks.
for (int i = 3; i < polySize; ++i)
{
unityTriangles.Add(fbxMesh.GetPolygonVertex(polyIndex, 0));
unityTriangles.Add(fbxMesh.GetPolygonVertex(polyIndex, i - 1));
unityTriangles.Add(fbxMesh.GetPolygonVertex(polyIndex, i));
}
}
mesh = new Mesh
{
name = fbxMesh.GetName(),
vertices = unityVertices,
triangles = unityTriangles.ToArray()
};
mesh.RecalculateNormals();
m_meshInstances[fbxMesh] = mesh;
return(mesh);
}
/// <summary>
/// Process mesh data and setup MeshFilter component
/// </summary>
private void ProcessMesh(FbxNode fbxNode, GameObject unityGo)
{
FbxMesh fbxMesh = fbxNode.GetMesh();
if (fbxMesh == null)
{
return;
}
var unityMesh = new Mesh();
// create mesh
var unityVertices = new List <Vector3> ();
var unityTriangleIndices = new List <int> ();
// transfer vertices
for (int i = 0; i < fbxMesh.GetControlPointsCount(); ++i)
{
FbxVector4 fbxVector4 = fbxMesh.GetControlPointAt(i);
Debug.Assert(fbxVector4.X <= float.MaxValue && fbxVector4.X >= float.MinValue);
Debug.Assert(fbxVector4.Y <= float.MaxValue && fbxVector4.Y >= float.MinValue);
Debug.Assert(fbxVector4.Z <= float.MaxValue && fbxVector4.Z >= float.MinValue);
unityVertices.Add(new Vector3((float)fbxVector4.X, (float)fbxVector4.Y, (float)fbxVector4.Z));
}
// transfer triangles
for (int polyIndex = 0; polyIndex < fbxMesh.GetPolygonCount(); ++polyIndex)
{
int polySize = fbxMesh.GetPolygonSize(polyIndex);
// only support triangles
Debug.Assert(polySize == 3);
for (int polyVertexIndex = 0; polyVertexIndex < polySize; ++polyVertexIndex)
{
int vertexIndex = fbxMesh.GetPolygonVertex(polyIndex, polyVertexIndex);
unityTriangleIndices.Add(vertexIndex);
}
}
unityMesh.vertices = unityVertices.ToArray();
// TODO:
// - support Mesh.SetTriangles - multiple materials per mesh
// - support Mesh.SetIndices - other topologies e.g. quads
unityMesh.triangles = unityTriangleIndices.ToArray();
unityMesh.RecalculateNormals();
var unityMeshFilter = unityGo.AddComponent <MeshFilter> ();
unityMeshFilter.sharedMesh = unityMesh;
var unityRenderer = unityGo.AddComponent <MeshRenderer> ();
{
// Assign the default material (hack!)
var unityPrimitive = GameObject.CreatePrimitive(PrimitiveType.Quad);
var unityMat = unityPrimitive.GetComponent <MeshRenderer> ().sharedMaterial;
unityRenderer.sharedMaterial = unityMat;
UnityEngine.Object.DestroyImmediate(unityPrimitive);
}
}
/// <summary>
/// Process UV data and configure the Mesh's UV attributes
/// </summary>
private void ProcessUVs(FbxMesh fbxMesh, Mesh unityMesh, int maxUVs = 4)
{
// Import UV sets (maximum defined by maxUVs)
int uvsetIndex = 0;
// First just try importing diffuse UVs from separate layers
// (Maya exports that way)
FbxLayerElementUV fbxFirstUVSet = null;
FbxLayer fbxFirstUVLayer = null;
// NOTE: assuming triangles
int polygonIndexCount = fbxMesh.GetPolygonVertexCount();
int vertexCount = fbxMesh.GetControlPointsCount();
int [] polygonVertexIndices = new int [polygonIndexCount];
int j = 0;
for (int polyIndex = 0; polyIndex < fbxMesh.GetPolygonCount(); ++polyIndex)
{
for (int positionInPolygon = 0; positionInPolygon < fbxMesh.GetPolygonSize(polyIndex); ++positionInPolygon)
{
polygonVertexIndices [j++] = fbxMesh.GetPolygonVertex(polyIndex, positionInPolygon);
}
}
for (int i = 0; i < fbxMesh.GetLayerCount(); i++)
{
FbxLayer fbxLayer = fbxMesh.GetLayer(i);
if (fbxLayer == null)
{
continue;
}
FbxLayerElementUV fbxUVSet = fbxLayer.GetUVs();
if (fbxUVSet == null)
{
continue;
}
if (fbxFirstUVSet != null)
{
fbxFirstUVSet = fbxUVSet;
fbxFirstUVLayer = fbxLayer;
}
switch (uvsetIndex)
{
case 0:
unityMesh.uv = ProcessUVSet(fbxUVSet, polygonVertexIndices, vertexCount);
break;
case 1:
unityMesh.uv2 = ProcessUVSet(fbxUVSet, polygonVertexIndices, vertexCount);
break;
case 2:
unityMesh.uv3 = ProcessUVSet(fbxUVSet, polygonVertexIndices, vertexCount);
break;
case 3:
unityMesh.uv4 = ProcessUVSet(fbxUVSet, polygonVertexIndices, vertexCount);
break;
}
uvsetIndex++;
if (uvsetIndex == maxUVs)
{
break;
}
}
// If we have received one UV set, check whether the same layer contains an emissive UV set
// that is different from diffuse UV set.
// 3dsmax FBX exporters doesn't export UV sets as different layers, instead for lightmapping usually
// a material is set up to have lightmap (2nd UV set) as self-illumination slot, and main texture
// (1st UV set) as diffuse slot.
if (uvsetIndex == 1 && fbxFirstUVSet != null)
{
FbxLayerElementUV fbxSecondaryUVSet = null;
// TODO: check if we've already passed eTextureEmissive layer
for (int i = (int)FbxLayerElement.EType.eTextureEmissive; i < (int)FbxLayerElement.EType.eTypeCount; i++)
{
fbxSecondaryUVSet = fbxFirstUVLayer.GetUVs((FbxLayerElement.EType)i);
if (fbxSecondaryUVSet != null)
{
break;
}
if (fbxSecondaryUVSet != null)
{
unityMesh.uv2 = ProcessUVSet(fbxSecondaryUVSet,
polygonVertexIndices,
vertexCount);
uvsetIndex++;
}
}
}
}
