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 ReflectiveIndex.info (link no longer works) 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

250

249

 

255

255

255

 

1.082

1

fefefd

Gold

 

243

201

104

 

255

255

255

 

1.35002

1

fbe6ab

Copper

 

238

158

137

 

255

255

255

 

1.21901

1

f8cfc2

Aluminium

 

230

233

235

 

255

255

255

 

1.002

1

f5f6f6

Chromium

 

141

141

141

 

255

255

255

 

1.03

1

c5c5c5

Lead

 

167

168

176

 

255

255

255

 

1.016

1

d4d5d9

Platinum

 

243

238

216

 

255

255

255

 

1.024

1

faf8ee

Titanium

 

246

239

208

 

255

255

255

 

1.086

1

fcf9ea

Tungsten

 

236

213

193

 

255

255

255

 

1.007

1

f7ece2

Iron

 

226

223

210

 

255

255

255

 

1.006

1

f3f1eb

Vanadium

 

241

228

199

 

255

255

255

 

1.034

1

faf3e5

Zinc

 

223

221

218

 

255

255

255

 

1.011

1

f1f0ef

Nickel

 

226

219

192

 

255

255

255

 

1.016

1

f3efe2

Mercury

 

199

198

198

 

255

255

255

 

1.013

1

e5e5e5

Cobalt

 

174

167

157

 

255

255

255

 

1.031

1

d8d4cf

 

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

 


 

Examples

Below are some examples and their settings.

 

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


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

 

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

 

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


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