Render ObiSimpleFluidRenderer before everything

[rosedev]

Changing the moment at which the command buffer is added to the pipeline will have no effect if the shader is using the depth buffer to perform ztesting. You should modify SimpleFluid.shader to disable depth testing and/or change its render queue. See:
https://docs.unity3d.com/560/Documentati...Depth.html
https://docs.unity3d.com/Manual/SL-SubShaderTags.html

Thank you! I added 

Code:

ZWrite  Off

and it works now.