Find Class Esp Struct PointBlank

how to find a struct class esp
please teach me to look for it

class RenderContext
{
public:
RenderData * pRenderData;
unknown4 char [1076]; // Please give me a string to search for this
D3DXVECTOR3 bone;
D3DXVECTOR3 bone1;
D3DXVECTOR3 bone2;
};

class RenderData
{
public:
unknown0 char [2400]; // please give me a string to search for this
D3DXMATRIX ViewMatrix;
D3DXMATRIX ProjMatrix;
D3DXMATRIX GetWorldMatrix;
D3DXMATRIX WorldView [80];
};

I ask the members here

in i3GfxDx.dll