Wavefront OBJ

Tham Chiếu (Reference)

Hạng Mục (Category)

Nhập-Xuất Khẩu (Import-Export)

Trình Đơn (Menu)

File ‣ Import ‣ Wavefront (.obj)

OBJ is a widely used de facto standard in the 3D industry. The OBJ format is a popular plain text format, however, it has only basic geometry and material support.

  • Mesh: vertices, faces, edges, normals, UVs

  • Separation by groups/objects

  • Materials/textures

  • NURBS curves and surfaces

Ghi chú

There is no support for mesh Color Attributes, armatures, animation, lights, cameras, empty objects, parenting, or transformations.

Ghi chú

Blender now only supports complex node-based shading. OBJ having a fixed pipeline-like support of materials, this add-on uses the generic wrapper featured by Blender to convert between both.

Cảnh báo

Importing very large OBJ-files (over a few 100mb), can use a lot of RAM.

Cách Sử Dụng (Usage)

Import geometry and curves to the OBJ format.

If there is a matching .MTL for the OBJ then its materials will be imported too.

Tính Chất (Properties)

Nhập (Import)

Include/Bao Gồm cả (Include)

Tìm Kiếm Hình Ảnh (Image Search)

This enables a recursive file search if an image file can't be found.

Các Nhóm Mịn (Smooth Groups)

Surround OBJ smooth groups by sharp edges. Note that these will only be displayed when the Edge Split modifier is enabled.

Đường Thẳng/(Số) Đường Kẻ/Thẳng/Dòng (Lines)

Import OBJ lines and two-sided faces as mesh edges.

Transform (Biến Hóa)

Clamp Size

OBJ-files often vary greatly in scale, this setting clamps the imported file to a fixed size.

Hướng Trước / Hướng Lên Trên (Forward / Up)

Vì các trình ứng dụng sử dụng một trục khác biệt cho chiều hướng Lên/Trên, cho nên chúng ta cũng cần có sự chuyển đổi cho các sắp đặt này, Trục Hướng Trước và Lên Trên -- Bằng việc Ánh Xạ những trục này sang các trục khác, bạn có thể chuyển đổi sự xoay chiều giữa các trục hướng về phía trước và lên trên giữa các trình ứng dụng.

Blender dùng Y Hướng Trước, Z Hướng Trên (vì góc nhìn từ đằng trước vọng dọc theo chiều +Y). Lấy ví dụ, việc trình ứng dụng sử dụng Y làm trục hướng lên trên là điều thông thường. Trong trường hợp này, -Z Hướng Trước, Y Hướng Trên là điều cần thiết.

Hình Học (Geometry)

Split/Keep Vertex Order

When importing an OBJ it's useful to split up the objects into Blender objects, named according to the OBJ-file. However, this splitting loses the vertex order which is needed when using OBJ-files as morph targets.It also loses any vertices that are not connected to a face or edge so this must be disabled if you want to keep the vertex order and loose vertices.

Split by Object & Split by Group

When importing an OBJ it's useful to split up the objects into Blender objects, named according to the OBJ-file. However, this splitting loses the vertex order which is needed when using OBJ-files as morph targets. It also loses any vertices that are not connected to a face, so this must be disabled if you want to keep the vertex order.

As far as Blender is concerned OBJ Objects and Groups are no difference, since they are just two levels of separation, the OBJ groups are not equivalent to Blender groups, so both can optionally be used for splitting.

OBJ Export

Exporting OBJ-files is built into Blender without the need of an add-on. It's documentation can be found here: OBJ Exporter </files/import_export/obj>.

Tính Tương Thích (Compatibility)

Còn Thiếu (Missing)

Some of the following features are missing:

  • Advanced Material Settings -- There are material options documented but very few files use them and there are few examples available.

  • Normals -- Blender ignores normals from imported files, recalculating them based on the geometry.