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My existing application successfully renders with the DrawPrimitive method, but when I started using the Direct3DDevice3 Interface, the primitives are not rendered properly. Why?

April 26, 2017application existing interface method primitives renders STARTED successfully

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My existing application successfully renders with the DrawPrimitive method, but when I started using the Direct3DDevice3 Interface, the primitives are not rendered properly. Why?

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The vertex description parameter of the DrawPrimitive functions has changed with the introduction of the flexible vertex format in DirectX 6.0 and above. For example, if you previously specified a vertex type flag of D3DVT_LVERTEX, you will now need to use a value of D3DFVF_LVERTEX instead. For a complete listing of the flexible vertex format flags, refer to the DirectX documentation for the DrawPrimitive method.