public:
     virtual bool __fastcall ProcessVerticiesStrided( dword pVertexOp, dword pDestIndex, dword pCount, TD3DDrawPrimitiveStridedData* pVertexArray, dword pSrcIndex, TDx_3DDevice* pD3DDevice, dword pFlags );

• Description
• Parameters
• See Also

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The TDx_3DVertexBuffer::ProcessVerticesStrided() method processes or moves strided vertices from one vertex buffer to another.

The destination buffer calls this method, effectively processing transformed strided vertices into itself from a source strided vertex buffer.
Processing consists of applying the transformation matrices of the TDx_3DDevice plus optional clipping, lighting and extents processing.

If the method call fails, the OnError event will be triggered with one of the following values:
D3DERR_INVALIDVERTEXFORMAT
DDERR_INVALIDOBJECT
DDERR_INVALIDPARAMS
DDERR_OUTOFMEMORY
DDERR_SURFACEBUSY
DDERR_SURFACELOST

VertexOp
The VertexOp parameter indicates how to process vertices as they are transferred.
The described effect applies when the flag is set.
D3DVOP_CLIP
Transform and clip vertices using the viewing frustrum.
Cannot be set for vertex buffers without clipping information.
eg: those with D3DVBCAPS_DONOTCLIP set.

D3DVOP_EXTENTS
Transform and update the screen rectangle extents when the vertices are rendered.

May improve performance, but the TDx_3DDevice::GetClipStatus() extents are not updated when this technique is employed.

D3DVOP_LIGHT
Transform and light the vertices.

D3DVOP_TRANSFORM
Transform the vertices using the world, view and projection matrices of the TDx_3DDevice.

This flag must always be set or the method will fail, returning DDERR_INVALIDPARAMS.

DestIndex
The DestIndex parameter indicates where processed vertices are to be placed in this, the destination buffer.

Count
The Count parameter defines how many of the source buffer vertices to process.

VertexArray
The VertexArray parameter references a TD3DDrawPrimitiveStridedData component describing the vertices of the primitive to be processed.

SrcIndex
The SrcIndex parameter indicates where in the TD3DDrawPrimitiveStidedData component to begin processing vertices.

D3DDevice
The D3DDevice parameter references the TDx_3DDevice that is being used to transform the vertices.

Flags
The Flags parameter indicates whether unmodified vertices should be transferred.
The described effect applies when the flag is set.

Set 0 for default processing, which is still copy vertices unmodified by the current vertex operation from the source to the destination buffer.

DONOTCOPYDATA
Copy only those vertices modified in the current vertex operation to the destination buffer.

TDx_3DVertexBuffer
TD3DDrawPrimitiveStridedData
TDx_3DDevice