The initial VRML/X3D node that created this cache record. This is only the first TMovieTextureNode node, that initiated this TTextureVideoCache item. Note that many TMovieTextureNode nodes may correspond to a single TTextureVideoCache (since TTextureVideoCache only tries to share TGLVideo between them, they don't have to share other fields like current time etc.). So this may help during _IncReference, but nothing more — it's *not* an exhaustive list of MovieTexture nodes related to this video texture!