TransientVertexBuffer structure is filled and is valid for the duration of frame, and it can be reused for multiple draw calls.
Vertex layout.
Number of vertices to allocate.
TransientIndexBuffer structure is filled and is valid for the duration of frame, and it can be reused for multiple draw calls.
Number of indices to allocate.
Check for required space and allocate transient vertex and index buffers. If both space requirements are satisfied function returns true. Remarks: Only 16-bit index buffer is supported.