I'm confused 
A T-Junction, as far I know, is a corner of a triangle or quad which touches another polygon without sharing a point with it.
This can cause problems during rendering resulting from the way the graphic card calculate the pixels to be drawn. Because without a shared point it can't guarantee a closed surface due to rounding differences with the .dat source etc.
To prevent this you need to, imho, split the yellow quad in order to create the point it will share with the red quad. In this example the lines are purely to show the quad outlines, they are not physical lines.
Hope this is more clear, or I'm I missing something here?
A T-Junction, as far I know, is a corner of a triangle or quad which touches another polygon without sharing a point with it.
This can cause problems during rendering resulting from the way the graphic card calculate the pixels to be drawn. Because without a shared point it can't guarantee a closed surface due to rounding differences with the .dat source etc.
To prevent this you need to, imho, split the yellow quad in order to create the point it will share with the red quad. In this example the lines are purely to show the quad outlines, they are not physical lines.
Hope this is more clear, or I'm I missing something here?