Help with transparent texture sorting issue between 2 models

• Whenever my portal/wormhole model is viewed in front of my ocean scenery model, the portal model is not rendered.

• 3 of the 4 scenery models work, and they have $translucent materials as well as the ocean.

Visible portal model in front of desert scenery:

This pic shows how the portal model is invisible in front of the ocean but not the desert:

Totally invisible:

I have no idea why this is happening...
Please lemme know if you have a fix, thanks!

 

If I recall correctly you might have to make two and place them back to back

 

Yeah that portal model is 1-sided. Its invisible from the other side.

 

Fixed it by compiling the model with $opaque