MAX2C4D vs FBX Export — Why FBX Loses Your Corona & V-Ray Materials
FBX is the default way to move 3D scenes between software. But if you're using Corona or V-Ray in 3ds Max and need to get your scene into Cinema 4D, FBX will lose almost everything that matters.
Why FBX Fails with Corona Materials
FBX (Filmbox) is a geometry interchange format developed by Autodesk. It handles meshes, basic materials, and animation well — but it was never designed to transfer renderer-specific material graphs.
When you export a Corona scene via FBX, here's what happens:
- CoronaPhysicalMtl — stripped entirely. FBX has no representation for Corona's metalness/roughness model, SSS parameters, clearcoat layers, or thin film.
- Node graph — flattened. A CoronaBitmap piped through CoronaColorCorrect into CoronaMixMtl inside a CoronaLayeredMtl? FBX sees none of it. The entire shader tree disappears.
- Multi/Sub-Object — material IDs are lost or collapsed. Per-face material assignments become one-material-per-object at best.
- Render settings — not part of the FBX spec. GI solver, denoiser, tone mapping, LUT — you have to copy everything manually.
- VRayMtl — stripped entirely. FBX cannot represent V-Ray's BRDF model, SSS parameters, coat layers, or VRay-specific shading trees.
- Corona lights — converted to generic lights. Shape, IES profile, Corona-specific settings gone.
The result? You get the geometry — untextured gray meshes with an empty material editor. Then you spend 4-8 hours rebuilding every material from screenshots of the Max scene.
How MAX2C4D Solves This
MAX2C4D doesn't use FBX at all. Instead, it uses a two-part approach:
Geometry: OBJ format
27x faster than FBX for polygon data. Clean, reliable, universally supported. Per-object export with memory management to handle massive scenes.
Scene data: JSON format
Materials, lights, cameras, render settings — everything FBX can't carry is serialized as structured JSON. The C4D importer reads this data and recreates native Corona and V-Ray nodes.
This approach means MAX2C4D isn't limited by what FBX supports. If Corona has a property, MAX2C4D transfers it.
Detailed Comparison: FBX Export vs. MAX2C4D
Corona & V-Ray materials
Completely stripped. FBX has no concept of CoronaPhysicalMtl, VRayMtl, or any renderer-specific material type. You get empty Standard materials or nothing at all.
Full node graph preserved. Corona and V-Ray materials are recreated as native renderer materials in C4D with all properties intact.
Node graph nesting
Flattened. A CoronaBitmap feeding into CoronaColorCorrect feeding into a roughness slot? FBX can't represent that — the entire shader tree is lost.
Recursively mapped. Every node connection is preserved. If a CoronaBitmap chains through 3 nodes to reach a material slot, that chain is rebuilt exactly.
Multi/Sub-Object
Material IDs lost. FBX assigns one material per object or collapses sub-materials into a flat list. Per-face material assignments are gone.
Polygon Selection Tags per material ID. Every face keeps its original material assignment, exactly like the Max scene.
Texture paths
Partially broken. FBX embeds some paths but breaks UNC, network drives, and cloud-synced files. You spend 30 minutes relinking bitmaps.
All textures collected locally. UNC paths, mapped drives, Synology NAS, OneDrive — all resolved and copied to a clean /tex folder. Zero missing bitmaps.
Lights
Generic point/spot/directional only. Corona light shapes (Rect, Disc, Sphere, Cylinder), IES profiles, and CoronaSun/CoronaMoon — all lost.
Full Corona light types with shape, intensity, color temperature, IES, and directionality preserved.
Cameras
Basic position and FOV only. Physical camera settings (f-stop, shutter speed, ISO), DOF, bloom & glare, and per-camera overrides — not exported.
Physical cameras with full exposure, DOF, post-processing, and per-camera override settings.
Render settings
Not exported. GI solver, denoiser, tone mapping, LUT — you're copying these values by hand from a screenshot of the Max render dialog.
Full render config transferred: GI, progressive rendering, denoiser, tone mapping, LUT, caustics, environment overrides.
ForestPack / scatter objects
Not exported. ForestPack objects are proprietary iToo Software geometry — FBX has no representation. Your forests, grass, and vegetation are completely absent from the exported file.
ForestPack objects automatically converted to Chaos Scatter in C4D. Density, transforms, include/exclude zones, texture maps, clustering, and slope/altitude limits all transfer.
V-Ray render settings
Not exported. V-Ray image sampler, DMC, GI, color mapping — none of it transfers.
~130 V-Ray parameters via VideoPost. VFB2 layers, environment fog, aerial perspective — full render pipeline.
Time (847-obj scene)
1-2 hours export + manual fixes. Then hours of material rebuilding, texture relinking, and render config copying.
43 seconds. Export from Max, import in C4D, hit render.
Real-World Test: Archviz Interior Scene
Tested on a production archviz interior — 847 objects, 200+ Corona materials, Multi/Sub-Object on furniture, textures on a Synology NAS.
Stop fighting FBX. Convert properly.
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