/// <summary>
/// Extract geometry (position, normal, UVs...) for a specific vertex
/// </summary>
/// <param name="mFnMesh"></param>
/// <param name="polygonId">The polygon (face) to examine</param>
/// <param name="vertexIndexGlobal">The object-relative (mesh-relative/global) vertex index</param>
/// <param name="vertexIndexLocal">The face-relative (local) vertex id to examine</param>
/// <param name="uvSetNames"></param>
/// <param name="isUVExportSuccess"></param>
/// <returns></returns>
private GlobalVertex ExtractVertex(MFnMesh mFnMesh, int polygonId, int vertexIndexGlobal, int vertexIndexLocal, MStringArray uvSetNames, ref bool[] isUVExportSuccess)
{
MPoint point = new MPoint();
mFnMesh.getPoint(vertexIndexGlobal, point);
MVector normal = new MVector();
mFnMesh.getFaceVertexNormal(polygonId, vertexIndexGlobal, normal);
MVector tangent = new MVector();
mFnMesh.getFaceVertexTangent(polygonId, vertexIndexGlobal, tangent);
// Switch coordinate system at object level
point.z *= -1;
normal.z *= -1;
tangent.z *= -1;
float[] tangentVec4 = new float[] { (float)tangent.x, (float)tangent.y, (float)tangent.z, -1 };
var vertex = new GlobalVertex
{
BaseIndex = vertexIndexGlobal,
Position = point.toArray(),
Normal = normal.toArray(),
Tangent = tangentVec4,
};
// Color
int colorIndex;
string colorSetName;
float[] defaultColor = new float[] { 1, 1, 1, 0 };
MColor color = new MColor();
mFnMesh.getCurrentColorSetName(out colorSetName);
if (mFnMesh.numColors(colorSetName) > 0)
{
//Get the color index
mFnMesh.getColorIndex(polygonId, vertexIndexLocal, out colorIndex);
//if a color is set
if (colorIndex != -1)
{
mFnMesh.getColor(colorIndex, color);
vertex.Color = color.toArray();
}
//else set the default color
else
{
vertex.Color = defaultColor;
}
}
// UV
int indexUVSet = 0;
if (uvSetNames.Count > indexUVSet && isUVExportSuccess[indexUVSet])
{
try
{
float u = 0, v = 0;
mFnMesh.getPolygonUV(polygonId, vertexIndexLocal, ref u, ref v, uvSetNames[indexUVSet]);
vertex.UV = new float[] { u, v };
}
catch (Exception e)
{
// An exception is raised when a vertex isn't mapped to an UV coordinate
isUVExportSuccess[indexUVSet] = false;
}
}
indexUVSet = 1;
if (uvSetNames.Count > indexUVSet && isUVExportSuccess[indexUVSet])
{
try
{
float u = 0, v = 0;
mFnMesh.getPolygonUV(polygonId, vertexIndexLocal, ref u, ref v, uvSetNames[indexUVSet]);
vertex.UV2 = new float[] { u, v };
}
catch (Exception e)
{
// An exception is raised when a vertex isn't mapped to an UV coordinate
isUVExportSuccess[indexUVSet] = false;
}
}
return(vertex);
}
/// <summary>
/// Extract geometry (position, normal, UVs...) for a specific vertex
/// </summary>
/// <param name="mFnMesh"></param>
/// <param name="polygonId">The polygon (face) to examine</param>
/// <param name="vertexIndexGlobal">The object-relative (mesh-relative/global) vertex index</param>
/// <param name="vertexIndexLocal">The face-relative (local) vertex id to examine</param>
/// <param name="uvSetNames"></param>
/// <param name="isUVExportSuccess"></param>
/// <returns></returns>
private GlobalVertex ExtractVertex(MFnMesh mFnMesh, int polygonId, int vertexIndexGlobal, int vertexIndexLocal, MStringArray uvSetNames, ref bool[] isUVExportSuccess, ref bool isTangentExportSuccess)
{
MPoint point = new MPoint();
mFnMesh.getPoint(vertexIndexGlobal, point);
MVector normal = new MVector();
mFnMesh.getFaceVertexNormal(polygonId, vertexIndexGlobal, normal);
// Switch coordinate system at object level
point.z *= -1;
normal.z *= -1;
var vertex = new GlobalVertex
{
BaseIndex = vertexIndexGlobal,
Position = point.toArray(),
Normal = normal.toArray()
};
// Tangent
if (isTangentExportSuccess)
{
try
{
MVector tangent = new MVector();
mFnMesh.getFaceVertexTangent(polygonId, vertexIndexGlobal, tangent);
// Switch coordinate system at object level
tangent.z *= -1;
int tangentId = mFnMesh.getTangentId(polygonId, vertexIndexGlobal);
bool isRightHandedTangent = mFnMesh.isRightHandedTangent(tangentId);
// Invert W to switch to left handed system
vertex.Tangent = new float[] { (float)tangent.x, (float)tangent.y, (float)tangent.z, isRightHandedTangent ? -1 : 1 };
}
catch
{
// Exception raised when mesh don't have tangents
isTangentExportSuccess = false;
}
}
// Color
int colorIndex;
string colorSetName;
float[] defaultColor = new float[] { 1, 1, 1, 0 };
MColor color = new MColor();
mFnMesh.getCurrentColorSetName(out colorSetName);
if (mFnMesh.numColors(colorSetName) > 0)
{
//Get the color index
mFnMesh.getColorIndex(polygonId, vertexIndexLocal, out colorIndex);
//if a color is set
if (colorIndex != -1)
{
mFnMesh.getColor(colorIndex, color);
vertex.Color = color.toArray();
}
//else set the default color
else
{
vertex.Color = defaultColor;
}
}
// UV
int indexUVSet = 0;
if (uvSetNames.Count > indexUVSet && isUVExportSuccess[indexUVSet])
{
try
{
float u = 0, v = 0;
mFnMesh.getPolygonUV(polygonId, vertexIndexLocal, ref u, ref v, uvSetNames[indexUVSet]);
vertex.UV = new float[] { u, v };
}
catch
{
// An exception is raised when a vertex isn't mapped to an UV coordinate
isUVExportSuccess[indexUVSet] = false;
}
}
indexUVSet = 1;
if (uvSetNames.Count > indexUVSet && isUVExportSuccess[indexUVSet])
{
try
{
float u = 0, v = 0;
mFnMesh.getPolygonUV(polygonId, vertexIndexLocal, ref u, ref v, uvSetNames[indexUVSet]);
vertex.UV2 = new float[] { u, v };
}
catch
{
// An exception is raised when a vertex isn't mapped to an UV coordinate
isUVExportSuccess[indexUVSet] = false;
}
}
// skin
if (mFnSkinCluster != null)
{
// Filter null weights
Dictionary <int, double> weightByInfluenceIndex = new Dictionary <int, double>(); // contains the influence indices with weight > 0
// Export Weights and BonesIndices for the vertex
// Get the weight values of all the influences for this vertex
allMayaInfluenceWeights = new MDoubleArray();
MGlobal.executeCommand($"skinPercent -query -value {mFnSkinCluster.name} {mFnTransform.name}.vtx[{vertexIndexGlobal}]",
allMayaInfluenceWeights);
allMayaInfluenceWeights.get(out double[] allInfluenceWeights);
for (int influenceIndex = 0; influenceIndex < allInfluenceWeights.Length; influenceIndex++)
{
double weight = allInfluenceWeights[influenceIndex];
if (weight > 0)
{
try
{
// add indice and weight in the local lists
weightByInfluenceIndex.Add(indexByNodeName[allMayaInfluenceNames[influenceIndex]], weight);
}
catch (Exception e)
{
RaiseError(e.Message, 2);
RaiseError(e.StackTrace, 3);
}
}
}
// normalize weights => Sum weights == 1
Normalize(ref weightByInfluenceIndex);
// decreasing sort
OrderByDescending(ref weightByInfluenceIndex);
int bonesCount = indexByNodeName.Count; // number total of bones/influences for the mesh
float weight0 = 0;
float weight1 = 0;
float weight2 = 0;
float weight3 = 0;
int bone0 = bonesCount;
int bone1 = bonesCount;
int bone2 = bonesCount;
int bone3 = bonesCount;
int nbBones = weightByInfluenceIndex.Count; // number of bones/influences for this vertex
if (nbBones == 0)
{
weight0 = 1.0f;
bone0 = bonesCount;
}
if (nbBones > 0)
{
bone0 = weightByInfluenceIndex.ElementAt(0).Key;
weight0 = (float)weightByInfluenceIndex.ElementAt(0).Value;
if (nbBones > 1)
{
bone1 = weightByInfluenceIndex.ElementAt(1).Key;
weight1 = (float)weightByInfluenceIndex.ElementAt(1).Value;
if (nbBones > 2)
{
bone2 = weightByInfluenceIndex.ElementAt(2).Key;
weight2 = (float)weightByInfluenceIndex.ElementAt(2).Value;
if (nbBones > 3)
{
bone3 = weightByInfluenceIndex.ElementAt(3).Key;
weight3 = (float)weightByInfluenceIndex.ElementAt(3).Value;
}
}
}
}
float[] weights = { weight0, weight1, weight2, weight3 };
vertex.Weights = weights;
vertex.BonesIndices = (bone3 << 24) | (bone2 << 16) | (bone1 << 8) | bone0;
if (nbBones > 4)
{
bone0 = weightByInfluenceIndex.ElementAt(4).Key;
weight0 = (float)weightByInfluenceIndex.ElementAt(4).Value;
weight1 = 0;
weight2 = 0;
weight3 = 0;
if (nbBones > 5)
{
bone1 = weightByInfluenceIndex.ElementAt(5).Key;
weight1 = (float)weightByInfluenceIndex.ElementAt(4).Value;
if (nbBones > 6)
{
bone2 = weightByInfluenceIndex.ElementAt(6).Key;
weight2 = (float)weightByInfluenceIndex.ElementAt(4).Value;
if (nbBones > 7)
{
bone3 = weightByInfluenceIndex.ElementAt(7).Key;
weight3 = (float)weightByInfluenceIndex.ElementAt(7).Value;
}
}
}
float[] weightsExtra = { weight0, weight1, weight2, weight3 };
vertex.WeightsExtra = weightsExtra;
vertex.BonesIndicesExtra = (bone3 << 24) | (bone2 << 16) | (bone1 << 8) | bone0;
}
}
return(vertex);
}
public static string toString(this MColor mColor)
{
return(mColor == null ? "" : mColor.toArray().toString());
}
