For rendering with Corona you can use maps exported from Substance Painter or the Substance plugin. Corona is using the Specular/Glossiness workflow with a 1/IOR map. You will need the following maps:
- Reflection (Specular)
- 1/IOR (Converted)
The 1/IOR map can only be converted from the metallic/roughness workflow which is the default workflow in both Substance Designer and Substance Painter.
- Export maps from Substance Painter using the Corona preset.
- For custom Substances, you can use the basecolor_metallic_roughness converted node set to the Vray preset to create the custom outputs.
- For 3ds Max and Cinema 4D, you use a layered Corona material to handle metal and dielectric materials and bypass the need to convert a 1/IOR map.