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 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 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);
}
}
