Visible green line after rendering

Hi, anyone have encountered this kind of lines appearing after rendering? Seems like if it’s low angle, the lines are hidden but visible when at high angle. I have tried removed the water and the lines disappeared.

Hello, can you tell me your D5 version? And for water, when modeling, the water material itself is a single-sided model,and the water material needs to have a flat surface underneath the model (i.e. water bottom) to better control the color of the water.

Hi, thanks for the reply. I have updated my D5 render version to date.

Turn off the caustic.

The water options are very poor in D5 specially with ocean waves and so on.