Question about vertex buffer layout

I was wondering if the vertex buffer layout is always the same from Unity 2018.4 with DirectX 11 ?

You are using this structure :

struct MeshVertex
{
	float pos[3];
	float normal[3];
	float color[4];
	float uv[2];
};

But let say I just want to use pos and color attributes from my shaders, could I use directly the structure below to fill my ID3D11Buffer ?

struct MeshVertex
{
	float pos[3];
	float color[4];
};

Then before calling the native plugin I could just initialize the mesh like that

m_meshFilter = GetComponent<MeshFilter>();
m_meshFilter.mesh = new Mesh();
m_meshFilter.mesh.indexFormat = IndexFormat.UInt32;
m_meshFilter.mesh.vertices = new Vector3[100000];
m_meshFilter.mesh.colors = new Color[100000];

Also, other question : Do I really need to call MarkDynamic() on the mesh instance if I only set the vertex buffer once during the game ?

Thank you.

The issue names no file, test, or entry point. Review the Unity 2018.4 DirectX 11 mesh and native-plugin usage described here, focusing on vertex attributes and MarkDynamic(); done means documenting whether the reduced layout is supported and whether MarkDynamic() is needed for a one-time upload.