code: public void setVertexBuffer(GVRVertexBuffer vbuf)
      {
          if (vbuf == null)
          {
              throw new IllegalArgumentException("Vertex buffer cannot be null");
          }
          mVertices = vbuf;
          NativeMesh.setVertexBuffer(getNative(), vbuf.getNative());
      }
docs: Changes the vertex buffer associated with this mesh.
  @param vbuf new vertex buffer to use
  @see #setVertices(float[])
  @see #getVertexBuffer()
  @see #getVertices()