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ior

  • Data type: float (usually in the range 1.0 - 1.5)
  • What is it for: specifying the index of refraction for a material
  • Use when: creating semi-transparent materials
  • Implemented in MakeSkin: yes
  • Makes visible difference in blender: yes
  • Makes visible difference in makehuman: no

Ior is a property of the principled node in blender, used to specify the index of refraction of a material. IOR is how much the light will bend when passing through the material, where a setting of 1.4 (ish) is how glass works, and 1.0 is no light bending at all.

The ior setting will only be relevant if the material also specifies a transparencymapTexture, as opaque materials won't be influenced by IOR.

The ior key is outside the MHMAT spec and is implemented solely for blender. It will have no effect in makehuman.

Example

To specify that the material has a glass-like refraction:

ior 1.4