Supported file formats ​

Simplygon supports following file formats

• Alembic (.abc)
• FBX (.fbx)
• glTF (.glt/.glb)
• Houdini geometry ( only .bgeo)
• OBJ (.obj)
• Simplygon File Format (.sg)
• STL (.stl)
• USD (.usd/.usdc/.usda)

Limitations ​

Currently there are a number of limitations to features supported in the various file formats

FBX ​

• Animations are not supported. See Tips And Tricks for a workaround.
• Selection sets are not supported
• There is limited support for blend modes and custom materials/shaders
• Due to limitations in the FBX SDK, all importer & exporter calls will be limited to one concurrent thread
• The FBX format can only contain one scene per file. Cascaded scene output will be converted into top-level nodes in the FBX scenes, one per cascaded scene in a depth-first pattern.
• Transforms on the root FBX node will be emulated with an inserted node at the top of the Simplygon scene hierarchy

glTF ​

• Different sampler wrap modes in S/T directions are not supported, S direction is used for both directions
• Cascaded scenes are output as separate glTF scenes in a depth-first pattern, with the top level scene set as the default glTF scene.

Extensions ​

• KHR_texture_transform is supported
• KHR_materials_clearcoat is supported
• KHR_materials_transmission is supported
• Any other required extensions will result in an error
• All other optional extensions are ignored

OBJ ​

• Cascaded scenes are not supported
• Bone data and skinned meshes are not supported

USD ​

• Only the UsdPreviewSurface material model is supported
• Blend shapes not supported