Embedded Files
Ensure you've downloaded the most recent versions of the assets
Select the Eye L object, open the Shader Editor and unmute (M) the muted Image Texture nodes.
Load the Sclera Albedo image into the Image Texture node that's connected to the Albedo Image input socket on the Eyeball node.
Load the Sclera Displacement image into the Image Texture node that's connected to the Displacement Image socket, and set its Color Space to Non-Color (see image on right).
Select the Iris object.
Load the Iris Melanin image into the Image Texture node that's connected to the Melanin Image socket on the Iris node, and set its Color Space to Non-Color.
Load the Fibres image into the Image Texture node that's connected to the Fibres Image socket.
Load one of the Iris Displacement images into the texture node that's connected to the Displacement Image socket, and set its Color Space to Non-Color.
Be sure to set the appropriate Cycles Render Device in Edit > Preferences > System, and select GPU Compute (if available) in Render Properties to maximise rendering speed.
Iris Colours
Iris Colours
The following example settings can be applied using the Eye Shader's Iris node (copy and paste the Tint and Base Hex values below into the Hex fields inside the colour pickers). They are configured for Refractive Caustics, so if you're not using caustics you'll need to increase the Melanin, Tint and Base values. Note that higher values than 1.0 can be entered in the Value fields.
Tint Hex: B1E9FF 9AB3A4 8FAF83 93A57E 929C7E --- ---Base Hex: 31657E 55676F 1E3F49 485758 757133 A9A557 ---
Tip: Lower the Displacement amount or swap out Displacement maps for subtle variations.
Eyeball Colours
Eyeball Colours
The settings on the right can be applied to the Eye Shader's Eyeball node to quickly approximate a bloodshot eye.
Tint Hex: FFB9B3Base Hex: FFFFFF
Displacement Maps
Displacement Maps
Iris Displacement A and B are designed to align with each other and with the Fibres map, so they can be overlaid and selectively mixed in an image editor. Displacement C is an example of this, with added melanin freckles which align with the freckles in the Melanin map. To help give the fibres some volume, the Fibres image was also overlaid on the displacement at 10% opacity.
Rendering
Rendering
For best results, make sure Displacement & Bump is selected in Material Properties > Settings > Surface > Displacement, and set the object's subdivision level as high as your hardware permits (especially for the Iris mesh). Keep a close eye on your memory usage while testing subdivision levels, as overdoing it can quickly exceed the available RAM and cause the system to hang or crash. For reference, a subdivision level of 7 for the Eye and 8 for the Iris is about the limit on an 8GB system when rendering a single eyeball.
Displacement detail may take a long time to resolve, especially when using denoising and caustics. When using denoising, make sure the Albedo and Normal passes are enabled.
For more rendering tips, see the Rendering section in the Eye Shader documentation.
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