Left : The environment setup for this scene, sans water & ground

• Sun lamp, used the sun lamp as the normal area lamp wasn’t giving a nice result

• Caustic mask

• Volume Water (cube, with principled volume shader applied)

• Volume Particles (cube ‘duplicate’, with geo node setup to create particulates in the water)

Left : As the ground was going to be part of this image instead of just a light bounce surface, decided to use geo nodes to generate a sandy floor

Left : Setup for the caustics mask

Left : Compositing node setup,

• Top 3 nodes create a gradient background to mimic the water going off into the distance

• Green and red lights have their own material indexes so I can use an index mask for both to generate slightly different blur effects for each

• Remaining nodes mix it all togther