Geo Nodes for a perfect Retina eye with customizable parameters and color shader

Pupil Scale:

What it does: Controls the size of the pupil.

Effect: Adjusting this value will make the pupil larger or smaller, mimicking the dilation or contraction of a real eye's pupil.

Eye Resolution:

What it does: Sets the overall resolution for the eye's textures and details.

Effect: Higher values will result in a more detailed and sharper eye appearance, while lower values will make it more pixelated or blurry.

Iris Material:

What it does: Allows you to assign a specific material to the iris part of the eye.

Effect: You can link different texture maps, colors, and shader properties here to define the appearance of the iris, such as its color, reflectivity, and patterns.

Pupil Material:

What it does: Allows you to assign a specific material to the pupil part of the eye.

Effect: Similar to the iris material, this lets you control the visual properties of the pupil, typically making it a dark, non-reflective surface.

Layer 1 Resolution:

What it does: Sets the resolution for the first layer of detail within the retina (or iris, depending on the specific implementation).

Effect: Impacts the sharpness and detail of the innermost layer's textures.

Layer 2 Resolution:

What it does: Sets the resolution for the second layer of detail within the retina/iris.

Effect: Controls the detail of an intermediate layer, contributing to the overall complexity and realism of the eye.

Layer 2 Noise Scale:

What it does: Controls the scale of the noise applied to Layer 2.

Effect: Determines how large or small the noise features appear on this layer, which can add subtle irregularities and organic details.

Layer 3 Resolution:

What it does: Sets the resolution for the third layer of detail within the retina/iris.

Effect: Impacts the sharpness and detail of the outermost or a further layer of the eye's intricate structure.

Layer 3 Noise Scale:

What it does: Controls the scale of the noise applied to Layer 3.

Effect: Similar to Layer 2 Noise Scale, this affects the size of noise features on the third layer, further enhancing the eye's visual complexity.