V67 IOR (Refractive index) LoRA for Flux

Optical Precision, Material Reality

Try my models: https://civarchive.com/user/angelomaiota/models

Premise: If you decide to use my model, I will give you 500 Yellow Buzz if your image is chosen for the cover of CIVITAI, even if used in combination with other models.

R+ images will be hidden from the gallery. LoRA model trained with Flux.

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

1. 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.

2. Wet Surface Realism
   Water droplets, sweat, tears, and rain create distinct edge highlights and internal refractions.

3. Glass & Transparency
   Wine glasses, crystals, and ice show correct background distortion, caustics, and rim lighting.

4. Organic Translucency
   Skin, fruit pulp, and wax honeycomb exhibit subsurface scattering – light enters, scatters, and exits softly.

5. High‑Gloss & Mirror Finishes
   Polished obsidian, mercury-like liquids, and acrylic plastics produce sharp, environment‑reflecting surfaces.

6. 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)

text

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

text

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

text

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

text

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

text

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)

text

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

text

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

text

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

text

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)

text

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

text

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

text

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)

text

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

text

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

text

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

text

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)

text

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

text

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)

text

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

text

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)

text

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)

text

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

text

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)

text

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

text

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

10. Atmosphere & Clouds (IOR 1.0)

text

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:

text

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:

text

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

Example Good Prompt:

text

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

1. Load Flux (Schnell, Dev, or Pro)

2. Load this LoRA at weight 0.65–0.75

3. Set CFG to 3.0–4.0

4. Write your prompt: start with v67, then describe subject + IOR in parentheses

5. Add lighting, camera, quality tags

6. Generate and explore optical precision

Example Workflow:

text

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

text

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

Diamond & Gemstones

text

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

Wet Skin & Sweat

text

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

text

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

text

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

text

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

Human Iris

text

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)

text

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

Liquid Metal

text

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

Frosted Acrylic

text

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. 💎💧