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The Index of Refraction plays an important role when creating a physically based material. Therefore, it has to be considered as part of the shader. The site https://refractiveindexsite RefractiveIndex.info/ is a great resource for understanding the proper IOR of different materials. However, inputting those numbers into a V-Ray shader will not match exactly. As such, Vlado has created this chart to help make the translation easier:

UI Text Box
typenote

With metallic materials (having Metalness value of 1), the Fresnel IOR parameter in the V-Ray for Maya user interface is not used.

 

 

Name

 

Base (diffuse) color

 

Reflection color

 
IOR

Metalness

Base color (web)

 
 

Red

Green

Blue

 

Red

Green

Blue

Silver

 

252

251
250

249

 

255

255

255

 

1

.082

1

fefefd

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Gold

 
243
244
201

202

104

 

255

255

250

255

195

 

1

.35002

1

fbe6ab

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Copper

 

238

158

159

137

 
255

254

255

231

255

216

 
1.21901

1

f8cfc2

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Aluminium

 
230

231

233

235

 
255

245

255

250

255

252

 
1.002

1

f5f6f6

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Chromium

 
141

142

141

141

 
255
145
255
142
255

176

 
1.03

1

c5c5c5

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Lead

 
167

168

168

169

176

 
255

191

255

192

255

209

 
1.016

1

d4d5d9

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Platinum

 
243

244

238

216

 
255

254

255

253

255

249

 

1

.0241

faf8ee

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Titanium

 

246

239

240

208

209

 
255

254

255

254

255

250

 
1.086

1

fcf9ea

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Tungsten

 

236

213

193

 
255

251

255

241

255

218

 

1

.007

1

f7ece2

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Iron

 
226
227
223
224
210
211
 
255
242
255

245

255

244

 

1

.006

1

f3f1eb

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Vanadium

 
241
242

228

199

 
255

254

255

251

255

242

 

1

.034

1

faf3e5

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Zinc

 

223

221

222

218

 
255
245
255
247
255

249

 
1.011

1

f1f0ef

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Nickel

 
226
227
219

220

192

193

 
255
245
255
245
255

237

 

1

.016

1

f3efe2

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Mercury

 

199

198

199

198

199

 
255

224

255

232

255

240

 

1

.013

1

e5e5e5

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Cobalt

 
174

175

167

168

157

158

 
255

205

255

205

255

208

 

1

.031

1

d8d4cf

Image Modified

 

For detailed information on the Metalness parameter, go to Chaos's blog post.

Useful information on metallic surfaces can be found at the Journal of Computer Graphics Techniques site.

 

 

Examples

Below are some examples and their settings.

Section

 

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Diffuse 255,255,255; Reflection 255,255,255; Glossiness 1; IOR 1.5

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Diffuse 0,0,0; Reflection 255,255,255; Glossiness 1; IOR 1.5.

 

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Diffuse 0,0,0; Reflection 255,255,255; Glossiness 1; IOR 2

 

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Diffuse 243,201,104 (gold); Reflection 255,255,255; Glossiness 1; IOR 1.35.

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Diffuse 46,46,46 (18% gray); Reflection 255,255,255; Glossiness 0.6; IOR 1.5.

 

 

 
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width60%
Image slider
Panel
borderStylenone

Image Added

Diffuse color (142, 141, 141), Reflection color (145, 142, 176), Glossiness 1

Chromium

Panel
borderStylenone

Image Added

Diffuse color (244, 202, 104), Reflection color (255, 250, 195), Glossiness 1

Gold

Panel
borderStylenone

Image Added

Diffuse color (227, 220, 193), Reflection color (245, 245, 237), Glossiness 1

Nickel

Move the slider to see the example renders.

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