Corona Physical → Legacy
Script for 3ds Max: converts CoronaPhysicalMtl materials to CoronaLegacyMtl. Suitable for Corona Renderer 7 and newer.
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Included
• Corona_Physical_To_Legacy_1_1.ms — runs without installation.
• Corona_Physical_To_Legacy_1_1.mcr — installs as a button on the panel;
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Installation
Option 1 — without installation (.ms)
Run the .ms file via Scripting → Run Script… or drag it into the 3ds Max window. The converter window will open immediately, and no button on the panel is created.
Option 2 — button on the panel (.mcr)
1. Drag the .mcr file into the 3ds Max window.
2. To place the button on the panel, open Customize → Customize User Interface → tab Toolbars → Group: Main UI → Category: PhysicalToLegacy. Drag the PTL button to the desired panel.
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Removal
• The .ms version installs nothing, so there is nothing to remove.
• For the .mcr version, delete the script file from the usermacros folder:
C:\Users\\AppData\Local\Autodesk\3dsMax\\ENU\usermacros
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Conversion modes:
• Only selected materials — selected materials in the Slate Material Editor or active slot in the Compact Material Editor;
• Only selected objects — materials of selected objects;
• Everything in scene — all materials in the scene.
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General:
• Material names are preserved.
• Physical materials are found within compound ones: Multi/Sub-Object, Blend, Layered, Mix, and others.
• Conversion can be undone via Ctrl+Z.
• After conversion, the script shows how many materials have been processed.
• Parameters with the same functionality in both materials (maps, checkboxes, values, modes) are transferred directly.
• Other parameters are transferred considering the physics of the material, as close to the original as possible. Maps and settings are preserved.
Conversion specifics
• Metal / Non-metal. Conversion depends on the metal mode in the material. Metal gets Fresnel IOR 20, and the color and Base color map go into reflection.
• Metalness map. A Corona Layered Mtl is created: non-metal at the bottom, metal on top, the Metalness map goes into the mask.
• Roughness. Roughness and Glossiness modes are taken into account.
• IOR. IOR and Specular modes are taken into account.
• Clearcoat. A Corona Layered Mtl with a top coat layer is created. The strength of the layer and the mask are taken from the Clearcoat settings. Clearcoat correctly combines with the Metalness map.
• Sheen. Approximation: a Falloff map is connected to Diffuse.
• Thin Shell.
o If Thin Shell is enabled, color and Thin Absorption maps are transferred to Refraction.
o If disabled, color and Refraction maps, as well as Volumetric Scattering and SSS, are transferred.
• Not transferred: Complex IOR, Edge Color.
Attention! Materials with Clearcoat, Sheen, Metalness map, Refraction, and Thin Shell should be checked against the original after conversion.
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For questions and issues, please send a private message.