public override bool getSourceIndexing(MObject obj, MComponentDataIndexing sourceIndexing)
{
// get the mesh from the current path, if it is not a mesh we do nothing.
MFnMesh mesh = null;
try {
mesh = new MFnMesh(obj);
} catch (System.Exception) {
return(false);
}
// if it is an empty mesh we do nothing.
int numPolys = mesh.numPolygons;
if (numPolys <= 0)
{
return(false);
}
// for each face
MUintArray vertToFaceVertIDs = sourceIndexing.indicesProperty;
uint faceNum = 0;
for (int i = 0; i < numPolys; i++)
{
// assign a color ID to all vertices in this face.
uint faceColorID = faceNum % 3;
int vertexCount = mesh.polygonVertexCount(i);
for (int j = 0; j < vertexCount; j++)
{
// set each face vertex to the face color
vertToFaceVertIDs.append(faceColorID);
}
faceNum++;
}
// assign the source indexing
sourceIndexing.setComponentType(MComponentDataIndexing.MComponentType.kFaceVertex);
return(true);
}
public override void createVertexStream(MObject objPath,
MVertexBuffer vertexBuffer,
MComponentDataIndexing targetIndexing,
MComponentDataIndexing sharedIndexing,
MVertexBufferArray sourceStreams)
{
// get the descriptor from the vertex buffer.
// It describes the format and layout of the stream.
MVertexBufferDescriptor descriptor = vertexBuffer.descriptor;
// we are expecting a float stream.
if (descriptor.dataType != Autodesk.Maya.OpenMayaRender.MHWRender.MGeometry.DataType.kFloat)
{
return;
}
// we are expecting a float2
if (descriptor.dimension != 2)
{
return;
}
// we are expecting a texture channel
if (descriptor.semantic != Autodesk.Maya.OpenMayaRender.MHWRender.MGeometry.Semantic.kTexture)
{
return;
}
// get the mesh from the current path, if it is not a mesh we do nothing.
MFnMesh mesh = null;
try {
mesh = new MFnMesh(objPath);
} catch (System.Exception) {
return; // failed
}
MUintArray indices = targetIndexing.indicesProperty;
uint vertexCount = indices.length;
if (vertexCount <= 0)
{
return;
}
unsafe {
// acquire the buffer to fill with data.
float *buffer = (float *)vertexBuffer.acquire(vertexCount);
for (int i = 0; i < vertexCount; i++)
{
// Here we are embedding some custom data into the stream.
// The included effects (vertexBufferGeneratorGL.cgfx and
// vertexBufferGeneratorDX11.fx) will alternate
// red, green, and blue vertex colored triangles based on this input.
*(buffer++) = 1.0f;
*(buffer++) = (float)indices[i]; // color index
}
// commit the buffer to signal completion.
vertexBuffer.commit((byte *)buffer);
}
}
public static List <Surface> meshToNurbs(MFnMesh mayaMesh)
{
MFnSubd subDmesh = new MFnSubd();
subDmesh.isIntermediateObject = true;
MPointArray mayaVerts = new MPointArray();
mayaMesh.getPoints(mayaVerts, MSpace.Space.kWorld);
MIntArray polyVertct = new MIntArray();
MIntArray ids = new MIntArray();
MIntArray idList = new MIntArray();
for (int i = 0; i < mayaMesh.numPolygons; i++)
{
mayaMesh.getPolygonVertices(i, ids);
foreach (var id in ids)
{
idList.Add(id);
}
polyVertct.Add(ids.Count);
}
subDmesh.createBaseMesh(false, mayaMesh.numVertices, mayaMesh.numPolygons, mayaVerts, polyVertct, idList);
try
{
MUintArray creaseEdgId = new MUintArray();
MDoubleArray creaseEdgeVal = new MDoubleArray();
mayaMesh.getCreaseEdges(creaseEdgId, creaseEdgeVal);
foreach (var edgId in creaseEdgId)
{
subDmesh.edgeSetCrease(edgId, true);
}
}
catch {}
try
{
MUintArray creaseVertId = new MUintArray();
MDoubleArray creaseVertVal = new MDoubleArray();
mayaMesh.getCreaseVertices(creaseVertId, creaseVertVal);
foreach (var vertId in creaseVertId)
{
subDmesh.vertexSetCrease(vertId, true);
}
}
catch { }
subDmesh.updateAllEditsAndCreases();
MObjectArray nurbsSurfs = new MObjectArray();
subDmesh.convertToNurbs(nurbsSurfs);
List <MFnNurbsSurface> mfnSurfaceList = new List <MFnNurbsSurface>(nurbsSurfs.Count);
foreach (var surf in nurbsSurfs)
{
mfnSurfaceList.Add(new MFnNurbsSurface(surf));
}
List <Surface> dynSurfaceList = new List <Surface>(mfnSurfaceList.Count);
foreach (var mfnNS in mfnSurfaceList)
{
dynSurfaceList.Add(DMSurface.mNurbsSurfaceToDynamoSurface(mfnNS, MSpace.Space.kObject));
}
MGlobal.deleteNode(subDmesh.model);
return(dynSurfaceList);
}
