Sunken - documentation

Install

Edit > Preferences > Add-ons > drop-down arrow > Install from Disk..., pick sunken_v1.0.0.zip (don't unzip it) and tick Sunken. Blender 5.2 or newer.

Use

1. Select your objects.
2. 3D View > Sidebar (N) > nice mesh > Sunken: click a preset.
3. Tweak the sliders. The same buttons are in the Object menu.

Buttons

• Presets: apply (or update) the effect on the selected objects.
• Real geometry checkbox: also add the geometry (removable modifier). Off = material only.
• Unique Copy: own copy of a material shared with other objects.
• Remove: take it all off, exactly as it was.
• New Pattern / Copy to Selected: new seed / copy every setting to the selection.

Panels

• Global: Amount (master), Pattern Size, Seed, Per-Object variation, Bump
• Material Layers > Algae & Silt: Algae, Algae Color, Slime, Silt, Silt Color
• Material Layers > Crust & Stain: Coralline, Coralline Color, Worm Tubes, Water Stain, Stain Color
• Sea Life > Barnacles: Amount, Size
• Sea Life > Seaweed: Amount, Length, Current, Direction, Sway
• Sea Life > Creatures: Anemones, Starfish & Urchins, Size, Seed

Tips

• The underwater look of the pictures (teal fog and caustic light from above) is lighting, not part of the add-on: a big cube with a Principled Volume (teal, density about 0.04) and a spot light with a Voronoi pattern give the same mood.
• Barnacle Size sets the biggest ones; colonies mix small and big automatically.
• Turn Sway to 0 for still renders of long animations if playback gets slow.

Good to know

• Seaweed sway follows the scene time, so the modifier updates on every frame during playback.
• Barnacles avoid surfaces facing straight up (the silt covers them); use the sides for colonies.
• Creatures are light instances; the seaweed is real geometry (lower Amount on huge areas).
• Curves and text get the material layers only; the sea life needs a mesh.