it is indeed the shader, cheung
if i comment out this line
self.waterNP.setShader(loader.loadShader( 'ocean2.sha' ))in the ocean2.py script I reach the end of the script loading without errors, but of course I miss the show. Unfortunately I ain’t the knowledge to fix a shader but FYI the “shader wave demo” works very nice here on both the waves deformations and also the yarr water demo runs nice as well so it is just a matter to merge the wave shader with the sea shader of the yarr and voila’