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OK so happy with mirrors now stuck on refraction. Doing refraction I expected something like this. but got this here's the playground http://www.babylonjs-playground.com/#1YAIO7#12 played around with waterMaterial.refractionTexture.depth = 10; waterMaterial.indexOfRefraction = 5 but am getting nowhere. Any suggestions?

Not so much a question as an answer I hope. Scroll down to the bottom if you want to get to the important bit about how to do it. Very slowly I am putting together a BJS Guide as a companion to the official documentation and working on materials I came across reflectionTextures and MirrorTextures.and got well lost. With some help from @Deltakosh I sort of got it for coordinatesMode and started on mirrors and couldn't make them work. So after a search or two I found @Luaacro 's book , @JCPalmer 's and @dbawel 's discussion All very useful but I knew I had to sort out mirrors for my own satisfaction. First I needed to know if the reflection was as far behind the mirror as the object was in front, set I set up the construction of a rod from the object to where the reflection should be then I set out to play with mirrors until it worked. Finally after three days I think I have cracked it (so forgive me for a little joy and the post) http://www.babylonjs-playground.com/#1YAIO7#3 HERE BE CRACKED MIRRORS Hopefully this will be useful for others - the important bit - the explanation lies with the guide http://babylonjsguide.github.io/advanced/Reflect The guide is in early days of construction so not much there at the moment but it is something I can give back to BJS, et al.