I would like to use this issue to keep track of the GLTF2 exporter features. I’ve copied the initial list of features discussed on the PR #11917 and I’ll keep updating the list as we progress in the implementation.

Features / TO-DO

• Export options

  • trs to export TRS instead of matrix
  • input:
    • Single scene
    • Array of scenes
    • Single object
    • Array of objects
  • truncateDrawRange: force exporting just the attribute values defined by drawRange:
  • Non-index buffer geometry
  • Indexed buffer geometry

• Include userData in extras?

• Scenes

  • Support for multiple scenes

• Nodes

  • Meshes
    • Primitive mode:
      • TRIANGLES
      • TRIANGLE_STRIP
      • TRIANGLE_SPAN
      • POINTS
      • LINES
      • LINE_STRIP
      • LINE_LOOP
    • Geometry types:
      • BufferGeometry
      • Geometry
    • Primitive attributes:
      • POSITION
      • NORMAL
      • TEXCOORD_0
      • TEXCOORD_1
      • COLOR_0
      • JOINTS_0
      • WEIGHTS_0
      • TANGENT
    • Multi-material meshes as primitives
  • Lights
  • Camera
  • Skin

• Materials:

  • Ignore if default material is being used
  • Export as lines if material.wireframe === true
  • pbrMetallicRoughness for MeshStandardMaterial
    • Attributes:
      • baseColorFactor
      • metallicFactor
      • roughnessFactor
      • baseColorTexture: It’s supported (material.map) but the texCoord is always set to 0.
    • doubleSided
    • KHR_material_unlit

• Samplers

• Images

  • uri using map.image.src
  • uri base64
  • bufferView
  • Deal with flipY images
  • Merge channels into one texture

• Accessors

  • Use the same bufferView for the same componentType instead of creating a new one for each attribute (WIP @takahirox)
  • Support sparse?
  • Attributes:
    • bufferView
    • byteOffset: Currently it’s using 0 always as I’m creating a new bufferView for each accessor.
    • componentType
    • count
    • max
    • min
    • type:
      • SCALAR
      • VEC2
      • VEC3
      • VEC4

• BufferViews: Currently I’m creating a new bufferView for each Accessor, this should be fixed to use just one for these attributes that share the same componentType

  • Attributes:
    • buffer
    • byteOffset
    • byteLength
    • byteStride
    • target

• Buffers: Currently I’m saving everything to a single buffer so it will be just one entry in the buffers array.

  • byteLength
  • uri

• Animations

• misc:

  • Validate output (https://github.com/KhronosGroup/glTF-Validator)
  • Include stats option to log the number of items exported and maybe some timing?

• GLB

Example

Current demo:

Exported gltf loaded on @donmccurdy ‘s gltf viewer

GLTF: https://gist.github.com/fernandojsg/0e86638d81839708bcbb78ab67142640