V67 IOR (Refractive index) LoRA for Flux

Optical Precision, Material Reality

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Now also available for Z Image Turbo

Remember to put in the prompt (IOR:1.1) with the correct value of the material you want to make.

Overview

Step into the physics of light. This LoRA gives Flux precise control over the Index of Refraction (IOR) – the optical property that defines how light bends, reflects, and transmits through any material. From the subtle sheen of wet skin (IOR 1.42) to the explosive fire of a diamond (IOR 2.42), from the clarity of a wine glass (IOR 1.55) to the translucency of a lemon slice (IOR 1.35 + SSS) – V67 IOR unlocks physically plausible surfaces, reflections, and refractions.

Base Model: Flux (Schnell / Dev / Pro)
Trigger Word: v67
Alternative Triggers: ior_ctrl, mat_ior

Why Flux + IOR Control?

Flux already handles lighting and texture exceptionally well. The V67 IOR LoRA teaches it to interpret numerical IOR values as specific optical behaviors – creating consistent, realistic materials across thousands of generations.

CapabilityWhy Flux ExcelsSpecular reflectionsFlux renders sharp vs. blurred highlights based on IOR and surface roughnessRefraction & causticsGlass, water, and ice show correct light bending and focused light patternsSubsurface scatteringSkin, citrus pulp, and honeycomb cells glow from withinWetness & moistureDroplets, tears, and wet skin maintain realistic edge refractionDispersionDiamonds and crystals produce rainbow fire (IOR 2.42)

Signature Style Elements

Physically Accurate IOR Ranges
Every material behaves according to its real-world refractive index – water 1.33, glass 1.5-1.6, diamond 2.42.
Wet Surface Realism
Water droplets, sweat, tears, and rain create distinct edge highlights and internal refractions.
Glass & Transparency
Wine glasses, crystals, and ice show correct background distortion, caustics, and rim lighting.
Organic Translucency
Skin, fruit pulp, and wax honeycomb exhibit subsurface scattering – light enters, scatters, and exits softly.
High‑Gloss & Mirror Finishes
Polished obsidian, mercury-like liquids, and acrylic plastics produce sharp, environment‑reflecting surfaces.
Layered Optical Effects
Human hair (double IOR: 1.55 primary, 1.45 secondary), fingernails (1.53 + SSS), and irises (cornea 1.376 + lens 1.39).

Trigger Word & Usage

TriggerBest Use Casev67Primary trigger – place near the beginning of your prompt, before IOR valuesior_ctrlWhen you want to emphasize numerical IOR precisionmat_iorLighter touch, good for hybrid scenes with multiple materials

Recommendation: Use v67 once at the start of your prompt, then list subjects with their IOR values in parentheses. Example:
v67, wine glass (IOR:1.55), water droplets (IOR:1.33), polished wood table (IOR:1.52)

Optimized Settings for Flux

ParameterFlux SchnellFlux Dev / ProLoRA Weight0.55 – 0.750.65 – 0.85CFG Scale2.0 – 3.53.0 – 4.5Steps4 – 620 – 30SamplerEulerEuler, DPM++ 2M KarrasGuidance2.5 – 3.53.5 – 4.5

Starting Point Recommendations

GoalLoRA WeightCFGNotesSubtle IOR enhancement0.63.0Adds realism without dominatingBalanced material accuracy0.73.5Sweet spot for most promptsStrong optical effects0.84.0Intense caustics, reflections, wetness

20 Sample Prompts (Flux-Optimized)

These prompts cover the full IOR spectrum – from air (1.0) to diamond (2.42) – avoiding children and glass people.

1. Glass & Crystal (IOR 1.5 – 2.4)

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v67, a crystal wine glass filled with red wine (IOR:1.55), strong backlight, rainbow caustics on white tablecloth, sharp rim reflections, macro product shot

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v67, diamond ring on black velvet (IOR:2.42), brilliant fire dispersion, rainbow sparkles, white spotlight, jewelry macro photography

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v67, empty whiskey tumbler (IOR:1.52), ice cubes inside (IOR:1.31), condensation droplets on outer surface (IOR:1.33), dark bar background

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v67, crystal vase with fresh water (IOR:1.60 for crystal, 1.33 for water), fluted glass texture, sunlight through window, caustics on wall

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v67, magnifying glass (IOR:1.52) held over a printed map, distorted letters visible, brass frame, macro, shallow depth of field

2. Wet Skin & Moisture (IOR 1.33 – 1.45)

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v67, close-up of a 22-year-old woman's face, wet skin after swimming (IOR:1.42), water droplets on forehead and cheeks (IOR:1.33), dripping from chin, soft window light

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v67, human tear rolling down a cheek (IOR:1.33), wet specular highlight on the tear edge, skin IOR 1.4, macro, emotional expression

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v67, sweaty skin after workout (IOR:1.42), forehead and shoulders glistening, studio rim light, macro texture, realistic oil-water mix

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v67, wet lips (IOR:1.38) with a single water droplet on lower lip, soft focus background, natural lighting, beauty shot

3. Citrus, Fruit & Organic Translucency (IOR 1.35 + SSS)

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v67, slice of juicy lemon (IOR:1.35), light passing through moist pulp, subsurface scattering, backlit, yellow/orange translucency, fresh cut surface

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v67, orange segment (IOR:1.36) with visible juice vesicles, backlight creating soft glow, macro, water droplets on surface (IOR:1.33)

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v67, lime wedge on a glass rim (IOR:1.35), green translucent flesh, bright sunlight, cocktail setting, sharp shadows

4. Water, Ice & Liquids (IOR 1.31 – 1.36)

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v67, frozen lake surface at sunset (IOR:1.31), micro-surface scratches, bubbles trapped beneath the ice, cold blue tones, anisotropic reflections

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v67, water splash in a clear glass (IOR:1.33), high-speed photography, droplets suspended in air, bright flash, white background

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v67, honey dripping from a wooden dipper (IOR:1.36), viscous golden liquid, backlit amber glow, macro, warm tones

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v67, mercury-like liquid metal pool on a dark rock (IOR:2.0), mirror reflection of alien sky, high surface tension, no wetting

5. Obsidian, Minerals & Exotic Solids (IOR 1.8 – 2.0)

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v67, polished obsidian dragon scale (IOR:1.8), reflecting a distorted fiery environment, volcanic glass texture, conchoidal fracture edges, macro

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v67, faceted black onyx (IOR:1.65) on a leather surface, sharp specular highlights, dark background, luxury jewelry shot

6. Honeycomb & Beeswax (IOR ~1.49)

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v67, bees on honeycomb, translucent wax cells (IOR:1.49), fresh golden honey (IOR:1.36) filling some cells, backlit warm light, macro nature photography

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v67, close-up of honeycomb with liquid honey, light refracting through wax walls (IOR:1.49), soft bokeh, golden hour lighting

7. Human Eye – Multicolored Iris (IOR 1.376 – 1.39)

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v67, extreme macro shot of human iris, multicolored (blue, green, gold), wet corneal surface (IOR:1.376), crystalline lens beneath (IOR:1.39), bright specular catchlight, sharp radial fibers

8. Hair & Fingernails (Double IOR & SSS)

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v67, single strand of human hair (primary IOR 1.55, secondary IOR 1.45), backlit, cuticle scales visible, silky longitudinal specular streak, macro

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v67, human fingernail macro (surface IOR 1.53), wet-looking sharp highlight, soft subsurface scattering revealing pink nail bed, hard translucent keratin edge

9. Plastics & Acrylics (IOR 1.45 – 1.55)

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v67, acrylic cosmetic jar with pastel cream (IOR:1.49), translucent frosted finish, backlit with soft light, clean product render on white background

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v67, glossy plastic toy car (IOR:1.50), sharp reflections of a window, smooth curved surfaces, studio lighting

10. Atmosphere & Clouds (IOR 1.0)

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v67, cumulus clouds (IOR:1.0) at golden hour, soft volumetric lighting, no optical distortion, perfect vacuum reference, sky photography

Negative Prompt (Flux-Compatible)

Flux responds well to minimal negative prompting. This concise version works effectively:

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nsfw, low quality, worst quality, ugly, blurry, children, kid, baby, glass people, transparent human, glass statue of person, mannequin, plastic doll, text, watermark, signature

Note: Explicit exclusion of "glass people" and "children" protects against unwanted content.

Prompting Tips for Best Results with Flux

Do This:

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v67, [subject] with (IOR:x.xx), [material description], [lighting], [camera angle]

Example Good Prompt:

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v67, slice of juicy lemon (IOR:1.35), backlit translucent pulp, water droplets on rind (IOR:1.33), macro, bright sunlight

Keywords That Strengthen IOR Effects:

caustics, refraction, specular highlight, rim light
subsurface scattering, translucency, backlit
wet surface, droplet, condensation
polished, glossy, mirror-like
dispersion, rainbow flare (for IOR > 2.0)

Avoid:

Overloading with IOR values for every object (focus on 1-2 key materials)
Contradictory instructions (e.g., "matte diamond")
Extremely short prompts – Flux needs context for realistic refraction

Comparison: IOR Control Across Different Bases

AspectSD 1.5 / SDXLZ Image TurboFlux (This Model)Refraction accuracyModerateGoodExcellentCaustics renderingPoorFairSuperiorWet skin realismGoodVery GoodOutstandingGlass edge distortionModerateGoodExcellentDispersion (rainbow fire)FairGoodSuperiorSubsurface scatteringModerateGoodVery GoodLoRA weight range0.7-0.90.65-0.850.6-0.8

The Philosophy Behind V67 IOR

Index of Refraction is the hidden language of light. When you understand IOR, you understand why a diamond sparkles and water droplets magnify what’s behind them. This LoRA is not about copying photographs – it’s about giving Flux the optical vocabulary to invent new materials with physical plausibility.

"Light doesn't lie. With the right IOR, every reflection tells a truth about the surface."

This aesthetic appeals to those who appreciate:

Scientific accuracy in generative art
The beauty of authentic material behavior
Control over specular and refractive properties
Realism without sacrificing creativity

Training Details (For Reference)

Dataset: 60 high-quality images with precise IOR annotations (water, glass, diamond, skin, ice, honey, obsidian, plastics)
Trigger Integration: v67 embedded in all captions, followed by explicit (IOR:x.xx) tags
Training Resolution: 1024×1024 (Flux native)
Recommended Inference Resolution: 1024×1024 or 1536×1024 for wide scenes
Content Coverage: Wet skin (20%), Glass/Crystal (25%), Liquids/Ice (20%), Organics/Citrus/Honeycomb (15%), Gemstones/Minerals (10%), Hair/Nails/Eye (10%)

Quick Start Guide

Load Flux (Schnell, Dev, or Pro)
Load this LoRA at weight 0.65–0.75
Set CFG to 3.0–4.0
Write your prompt: start with v67, then describe subject + IOR in parentheses
Add lighting, camera, quality tags
Generate and explore optical precision

Example Workflow:

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Model: Flux Dev
LoRA: V67 IOR (weight 0.7)
CFG: 3.5
Steps: 25
Sampler: Euler

Prompt: v67, diamond ring (IOR:2.42) on black velvet, brilliant fire dispersion, rainbow sparkles, macro jewelry photography, white spotlight
Negative: nsfw, low quality, children, glass people, text, watermark

Curated Prompt Ideas by Category

Glass & Wine

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v67, a white wine glass (IOR:1.55) with condensation, pale wine inside, outdoor terrace sunset, golden rim light, elegant composition

Diamond & Gemstones

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v67, emerald cut diamond (IOR:2.42) with side baguettes, white gold setting, dark background, intense dispersion, luxury macro

Wet Skin & Sweat

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v67, portrait of a 22-year-old woman after rain, wet skin IOR 1.42, droplets on eyelashes IOR 1.33, soft overcast light, natural look

Citrus & Fruit

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v67, cross-section of a blood orange (IOR:1.36), deep red translucent flesh, backlit, water droplets on skin (IOR:1.33), macro food photography

Ice & Frozen Surfaces

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v67, ice cube melting on a slate plate (IOR:1.31), water puddle (IOR:1.33), refraction of background through ice, condensation trails

Honey & Beeswax

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v67, dripping honeycomb (wax IOR:1.49, honey IOR:1.36), golden backlight, macro, detailed hexagonal cells, warm amber tones

Human Iris

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v67, extreme macro of a hazel iris (cornea IOR:1.376, lens IOR:1.39), multicolored radial fibers, bright catchlight, medical illustration style

Hair Strand (Double IOR)

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v67, single blonde hair strand (primary IOR 1.55, secondary IOR 1.45), backlit, cuticle scales visible, silky streak, dark background

Liquid Metal

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v67, pool of liquid gallium (IOR:2.0) on a glass surface, mirror reflections, high surface tension, metallic luster, futuristic still life

Frosted Acrylic

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v67, frosted acrylic panel (IOR:1.49) with soft diffused backlight, translucent glow, no visible internal cracks, clean product background

Troubleshooting Common Issues

IssueSolutionNo visible refractionIncrease LoRA weight to 0.75–0.8, add "caustics, light bending" to promptWet skin looks oilySpecify "water droplets, not oil", reduce IOR to 1.40–1.42Glass looks like plasticAdd "sharp rim reflections, transparent shadows, IOR 1.55"Diamond lacks fireEnsure IOR 2.42, add "dispersion, rainbow sparkles, brilliant cut"Subsurface scattering missingAdd "backlit, translucency, light passing through"Unwanted glass peopleStrengthen negative prompt with "glass people, transparent human, glass statue"Children appearingAdd "children, kid, baby" to negative prompt

Credits & Notes

The V67 IOR LoRA draws from real-world optical physics, measurement data from material science, and the collective knowledge of render engineers, photographers, and CGI artists. From the refractive index of human tears to the caustics of a wine glass – this model celebrates the precision of light.

This LoRA is dedicated to artists who care about the physics of appearance – the ones who notice how water bends a straw, how a diamond splits white light into rainbows, and how a single droplet magnifies the world behind it.

"Refraction is not a bug of light. It's a feature of reality."

Ready to bend light?

Load V67 IOR, set your IOR values, and watch Flux paint with optical truth. Share your results with #V67IOR on Civitai. The physics of beauty awaits.

Bon voyage, optical explorer. 💎💧

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