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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 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:

 

Name

 

Base (diffuse) color

 

Reflection color

 

IOR

Metalness

Base color (web)

 
 

Red

Green

Blue

 

Red

Green

Blue

Silver

 

252

251
250
 

255

255

255

 

1.082

1

fefefd

Gold

 
244

202

104

 

255

250

195

 

1.35002

1

fbe6ab

Copper

 

238

159

137

 

254

231

216

 

1.21901

1

f8cfc2

Aluminium

 

231

233

235

 

245

250

252

 

1.002

1

f5f6f6

Chromium

 

142

141

141

 
145
142

176

 

1.03

1

c5c5c5

Lead

 

168

169

176

 

191

192

209

 

1.016

1

d4d5d9

Platinum

 

244

238

216

 

254

253

249

 

1.024

1

faf8ee

Titanium

 

246

240

209

 

254

254

250

 

1.086

1

fcf9ea

Tungsten

 

236

213

193

 

251

241

218

 

1.007

1

f7ece2

Iron

 
227
224
211
 
242

245

244

 

1.006

1

f3f1eb

Vanadium

 
242

228

199

 

254

251

242

 

1.034

1

faf3e5

Zinc

 

223

222

218

 
245
247

249

 

1.011

1

f1f0ef

Nickel

 
227

220

193

 
245
245

237

 

1.016

1

f3efe2

Mercury

 

199

199

199

 

224

232

240

 

1.013

1

e5e5e5

Cobalt

 

175

168

158

 

205

205

208

 

1.031

1

d8d4cf

 

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

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

 


 

Examples

Below are some examples and their settings.

 

Diffuse color (142, 141, 141), Reflection color (145, 142, 176), Glossiness 1, IOR 1.03

Chromium

Diffuse color (244, 202, 104), Reflection color (255, 250, 195), Glossiness 1, IOR 1.35002

Gold

Diffuse color (227, 220, 193), Reflection color (245, 245, 237), Glossiness 1, IOR 1.016

Nickel

Move the slider to see the example renders.