glTF 2.0¶
Ссылка
- Категория:
Импорт-Экспорт
- Меню:
Включение аддона¶
This add-on is enabled by default, in case it is not:
Откройте Blender и перейдите в раздел «Аддоны» в настройках Blender.
Search «glTF 2.0» and check the Enable Extension checkbox.
Использование¶
glTF™ (GL Transmission Format) используется для передачи и загрузки 3D-моделей в собственных и веб-приложениях. glTF уменьшает размер 3D-моделей и время выполнения, необходимое для распаковки и рендеринга этих моделей. Этот формат широко используется в Интернете и поддерживается в различных 3D-движках, таких как Unity3D, Unreal Engine 4 и Godot.
Этот импортер/экспортер поддерживает следующие функции glTF 2.0:
Меши (meshes)
Материалы (Principled BSDF) и материалы без затенения (Unlit)
Текстуры (textures)
Камеры (cameras)
Точечные источники света (точечный, прожекторный и направленный)
Расширения (перечислены ниже)
Дополнительные параметры (пользовательские свойства)
Анимация (ключевые кадры, ключи формы и скелетная анимация)
Меши (meshes)¶
Внутренняя структура glTF имитирует буферы памяти, обычно используемые графическими чипами при рендеринге в реальном времени, так что ресурсы могут быть доставлены на настольные, веб- или мобильные клиенты и быстро отображены с минимальной обработкой. В результате четырехугольники и n-угольники автоматически преобразуются в треугольники при экспорте в glTF. Незамкнутые UV-развертки и ребра с плоским затенением могут привести к несколько большему количеству вершин в glTF по сравнению с Blender, так как такие вершины разделяются при экспорте. Аналогично, кривые и другие данные, не относящиеся к мешам, не сохраняются и должны быть преобразованы в меши перед экспортом.
Экземпляры GPU¶
When the option is enable in Exporter, instances are exported using the EXT_mesh_gpu_instancing
extension.
There are some limitations, at export:
Экземпляры должны быть мешами и не иметь дочерних элементов
Все экземпляры должны быть дочерними элементами одного и того же объекта.
Это расширение не управляет вариациями материалов. Это означает, что сгенерированный файл может включать все экземпляры с одинаковыми материалами.
Обнаруженные экземпляры – это объекты с одинаковыми меш данными.
При импорте экземпляры создаются путём создания объектов с одинаковыми меш данными.
Материалы (materials)¶
The core material system in glTF supports a metal/rough PBR workflow with the following channels of information:
Основной цвет (base color)
Металлик (metallic)
Шероховатость (roughness)
Baked Ambient Occlusion
Normal Map (tangent space, +Y up)
Emissive
Некоторые дополнительные свойства материалов или их типы могут быть выражены с помощью расширений glTF. Полный список можно найти в разделе «расширений» данной документации.
Imported Materials¶
The glTF material system is different from Blender’s own materials. When a glTF file is imported, the add-on will construct a set of Blender nodes to replicate each glTF material as closely as possible.
The importer supports Metal/Rough PBR (core glTF), Spec/Gloss PBR (KHR_materials_pbrSpecularGlossiness
)
and some extension materials. The complete list can be found in Extensions part of this documentation.
Совет
Examining the result of the material import process is a good way to see examples of the types of material nodes and settings that can be exported to glTF.
Exported Materials¶
The exporter supports Metal/Rough PBR (core glTF) and Shadeless (KHR_materials_unlit
) materials.
It will construct a glTF material based on the nodes it recognizes in the Blender material.
The material export process handles the settings described below.
Примечание
When image textures are used by materials, glTF requires that images be in PNG or JPEG format. The add-on will automatically convert images from other formats, increasing export time.
Основной цвет (base color)¶
The glTF base color is determined by looking for a Base Color input on a Principled BSDF node. If the input is unconnected, the input’s default color (the color field next to the unconnected socket) is used as the Base Color for the glTF material.
If an Image Texture node is found to be connected to the Base Color input, that image will be used as the glTF base color.
Metallic and Roughness¶
These values are read from the Principled BSDF node. If both of these inputs are unconnected, the node will display sliders to control their respective values between 0.0 and 1.0, and these values will be copied into the glTF.
When using an image, glTF expects the metallic values to be encoded in the blue (B
) channel,
and roughness to be encoded in the green (G
) channel of the same image.
If images are connected to the Blender node in a manner that does not follow this convention,
the add-on may attempt to adapt the image to the correct form during exporting (with an increased export time).
In the Blender node tree, it is recommended to use a Separate RGB node
to separate the channels from an Image Texture node, and
connect the green (G
) channel to Roughness, and blue (B
) to Metallic.
The glTF exporter will recognize this arrangement as matching the glTF standard, and
that will allow it to simply copy the image texture into the glTF file during export.
The Image Texture node for this should have its Color Space set to Non-Color.
Baked Ambient Occlusion¶
glTF is capable of storing a baked ambient occlusion map.
Currently there is no arrangement of nodes that causes Blender
to use such a map in exactly the same way as intended in glTF.
However, if the exporter finds a custom node group by the name of glTF Material Output
, and
finds an input named Occlusion
on that node group,
it will look for an Image Texture attached there to use as the occlusion map in glTF.
The effect need not be shown in Blender, as Blender has other ways of showing ambient occlusion,
but this method will allow the exporter to write an occlusion image to the glTF.
This can be useful to real-time glTF viewers, particularly on platforms where there
may not be spare power for computing such things at render time.
Совет
If you enable Shader Editor Add-ons in preferences, you will be able to add this custom node group from Menu: Add > Output > glTF Material Output
glTF stores occlusion in the red (R
) channel, allowing it to optionally share
the same image with the roughness and metallic channels.
Совет
The Cycles render engine has a Bake panel that can be used to bake
ambient occlusion maps. The resulting image can be saved and connected
directly to the glTF Material Output
node.
Normal Map (Карта нормалей)¶
To use a normal map in glTF, connect an Image Texture node’s color output to a Normal Map node’s color input, and then connect the Normal Map normal output to the Principled BSDF node’s normal input. The Image Texture node for this should have its Color Space property set to Non-Color.
The Normal Map node must remain on its default property of Tangent Space as this is the only type of normal map currently supported by glTF. The strength of the normal map can be adjusted on this node. The exporter is not exporting these nodes directly, but will use them to locate the correct image and will copy the strength setting into the glTF.
Совет
The Cycles render engine has a Bake panel that can be used to bake tangent-space normal maps from almost any other arrangement of normal vector nodes. Switch the Bake type to Normal. Keep the default space settings (space: Tangent, R: +X, G: +Y, B: +Z) when using this bake panel for glTF. The resulting baked image can be saved and plugged into to a new material using the Normal Map node as described above, allowing it to export correctly.
See: Cycles Render Baking
Emissive¶
An Image Texture node can be connected to the Emission input on the Principled BSDF node to include an emissive map with the glTF material. Alternatively, the Image Texture node can be connected to an Emission shader node, and optionally combined with properties from a Principled BSDF node by way of an Add Shader node.
If the emissive map is alone in the material, it is best to set the Base Color default to black, and the Roughness default to 1.0. This minimizes the influence of the other channels if they are not needed.
If any component of emissiveFactor is > 1.0, KHR_materials_emissive_strength
extension will be used.
Clearcoat¶
When the Clearcoat input on the Principled BSDF node has a nonzero default value or
Image Texture node connected, the KHR_materials_clearcoat
glTF extension will be
included in the export. This extension will also include a value or Image Texture
from the Clearcoat Roughness input if available.
If Image Textures are used, glTF requires that the clearcoat values be written to
the red (R
) channel, and Clearcoat Roughness to the green (G
) channel.
If monochrome images are connected, the exporter will remap them to these color channels.
The Clearcoat Normal input accepts the same kinds of inputs as the base Normal input, specifically a tangent-space normal map with +Y up, and a user-defined strength. This input can reuse the same normal map that the base material is using, or can be assigned its own normal map, or can be left disconnected for a smooth coating.
All Image Texture nodes used for clearcoat shading should have their Color Space set to Non-Color.
Лоск (sheen)¶
If a Sheen Roughness Texture is used, glTF requires the values be written to the alpha (A
) channel.
Совет
Sheen BSDF node is only available on Cycles render engine. You may have to temporary switch to Cycles to add this node, and get back to EEVEE.
Блик (specular)¶
When the Specular IOR Level or Specular Tint input of Principled BSDF node have a non default value or
Image Texture node connected, the KHR_materials_specular
glTF extension will be
included in the export.
Анизотропия (anisotropy)¶
Anisotropic textures and data need to be converted at export, and at import.
At import, some nodes are created to manage this conversion
At export, this exact same nodes are detected, and used to export data.
At export, you can also plug some grayscale textures for Anisotropic and Anisotropic Rotation sockets. Then, exporter will convert these texture into a glTF compatible texture.
Note that the tangent socket must be linked to a tangent node, with UVMap. The choosen UVMap must be the UVMap of the Normal Map.
Светопропускаемость (transmission)¶
When the Transmission input on the Principled BSDF node has a nonzero default value or
Image Texture node connected, the KHR_materials_transmission
glTF extension will be
included in the export. When a texture is used, glTF stores the values in the red (R
) channel.
The Color Space should be set to Non-Color.
Transmission is different from alpha blending, because transmission allows full-strength specular reflections. In glTF, alpha blending is intended to represent physical materials that are partially missing from the specified geometry, such as medical gauze wrap. Transmission is intended to represent physical materials that are solid but allow non-specularly-reflected light to transmit through the material, like glass.
Совет
The material’s base roughness can be used to blur the transmission, like frosted glass.
Совет
Typically the alpha blend mode of a transmissive material should remain «Opaque», the default setting, unless the material only partially covers the specified geometry.
Примечание
In real-time engines where transmission is supported, various technical limitations in the engine may determine which parts of the scene are visible through the transmissive surface. In particular, transmissive materials may not be visible behind other transmissive materials. These limitations affect physically-based transmission, but not alpha-blended non-transmissive materials.
Примечание
If you want to enable refraction on your model, KHR_materials_transmission
must also
be used in addition with KHR_materials_volume
. See the dedicated Volume part of
the documentation.
Предупреждение
Transmission is complex for real-time rendering engines to implement,
and support for the KHR_materials_transmission
glTF extension is not yet widespread.
Коэффициент преломления/индекс рефракции (IOR)¶
At import, there are two different situation:
if
KHR_materials_ior
is not set, IOR value of Principled BSDF node is set to 1.5, that is the glTF default value of IOR.If set, the
KHR_materials_ior
is used to set the IOR value of Principled BSDF.
At export, IOR is included in the export only if one of these extensions are also used:
KHR_materials_transmission
KHR_materials_volume
KHR_materials_specular
IOR of 1.5 are not included in the export, because this is the default glTF IOR value.
Объём (volume)¶
Volume can be exported using a Volume Absorption node, linked to Volume socket of Output node.
Data will be exported using the KHR_materials_volume
extension.
For volume to be exported, some transmission must be set on Principled BSDF node.
Color of Volume Absorption node is used as glTF attenuation color. No texture is allowed for this property.
Density of Volume Absorption node is used as inverse of glTF attenuation distance.
Thickness can be plugged into the Thickness socket of custom group node
glTF Material Output
.If a texture is used for thickness, it must be plugged on (
G
) Green channel of the image.
glTF Variants¶
Примечание
For a full Variants experience, you have to enable UI in Add-on preferences
There are two location to manage glTF Variants in Blender
In 3D View, on
glTF Variants
tabFor advanced settings, in Mesh Material Properties (see Advanced glTF Variant checks)
The main concept to understand for using Variants, is that each material slot will be used as equivalent of a glTF primitive.
glTF Variants switching¶
After importing a glTF file including KHR_materials_variants
extension, all variants can be displayed.
You can switch Variant, by selecting the variant you want to display, then clicking on Display Variant.
You can switch to default materials (when no Variant are used), by clicking on Reset to default.
Создание вариантов glTF¶
You can add a new Variant by clicking the +
at right of the Variant list.
Then you can change the name by double-clicking.
After changing Materials in Material Slots, you can assign current materials to the active Variant using Assign to Variant.
You can also set default materials using Assign as Original.
These materials will be exported as default material in glTF.
This are materials that will be displayed by any viewer that don’t manage KHR_materials_variants
extension.
Advanced glTF Variant checks¶
If you want to check primitive by primitive, what are Variants used, you can go to Mesh Material Properties.
The glTF Material Variants tab refers to the active material Slot and Material used by this slot. You can see every Variants that are using this material for the given Slot/Primitive.
You can also assign material to Variants from this tab, but recommendation is to perform it from 3D View tab.
Double-Sided / Backface Culling¶
For materials where only the front faces will be visible, turn on Backface Culling in the Settings panel of an EEVEE material. When using other engines (Cycles, Workbench) you can temporarily switch to EEVEE to configure this setting, then switch back.
Leave this box unchecked for double-sided materials.
Alpha Modes¶
glTF has three alpha modes, depending on whether the alpha value is always 1, always 0 or 1, or can be between 0 and 1. The exporter determines the alpha mode automatically from the nodes connected to the Alpha socket.
- Непрозрачность
In opaque mode, the material alpha is always 1.
- Маска (mask)
In mask mode, the material alpha is always 0 or 1. This creates «cutout» transparency, where there is a hard edge between opaque and transparent regions, and can be used for things like leaves or cloth with holes. To enable this mode, use a Math node to round the alpha value to either 0 or 1.
Rounding snaps alpha values that are 0.5 or greater up to 1, and ones below 0.5 down to 1. It is also possible to use a cutoff value different than 0.5 by using Math nodes to do
1 - (alpha < cutoff)
.Mask mode is essentially the same as EEVEE’s «Alpha Clip» blend mode, but is done with shader nodes so it works in other render engines.
- Смешение (blend)
Materials that use neither of these will use blend mode. Blend mode allows partially transparent surfaces that tint the objects seen through them, like layers of colored film. However, partial transparency is complex to render, and glTF viewers may show visual artifacts in non-trivial scenes that use blend mode.
To avoid artifacts, it may be a good idea to separate out parts of a model that can use opaque or mask mode, and use blend mode only on the parts where it is necessary, or to use only a single layer of transparent polygons in front of opaque objects.
UV Mapping¶
Control over UV map selection and transformations is available by connecting a UV Map node and a Mapping node to any Image Texture node.
Settings from the Mapping node are exported using a glTF extension named KHR_texture_transform
.
There is a mapping type selector across the top. Point is the recommended type for export.
Texture and Vector are also supported. The supported offsets are:
Location - X and Y
Rotation - Z only
Scale - X and Y
For the Texture type, Scale X and Y must be equal (uniform scaling).
Совет
These nodes are optional. Not all glTF readers support multiple UV maps or texture transforms.
Factors¶
Any Image Texture nodes may optionally be multiplied with a constant color or scalar. These will be written as factors in the glTF file, which are numbers that are multiplied with the specified image textures. These are not common.
Use Math node (multiply) for scalar factors. Use second value as factor
Use Mix node (color / multiply) for color factors. Set Factor to 1, and use Color2 (B) as factors
Пример¶
A single material may use all of the above at the same time, if desired. This figure shows a typical node structure when several of the above options are applied at once:
UDIM¶
UDIM is a way to store multiple textures in a single image file. The UDIM system is supported by Blender, but is not supported by glTF. When exporting a model that uses UDIM, the add-on will automatically split the image into multiple images, one for each tile, and will update the material nodes to use the new images. All UDIM texture must use the same UV map to be exported.
Exporting a Shadeless (Unlit) Material¶
To export an unlit material, mix in a camera ray, and avoid using the Principled BSDF node.
Расширения (extensions)¶
The core glTF 2.0 format can be extended with extra information, using glTF extensions. This allows the file format to hold details that were not considered universal at the time of first publication. Not all glTF readers support all extensions, but some are fairly common.
Certain Blender features can only be exported to glTF via these extensions. The following glTF 2.0 extensions are supported directly by this add-on:
Импортировать (Import)
KHR_materials_pbrSpecularGlossiness
KHR_materials_clearcoat
KHR_materials_transmission
KHR_materials_unlit
KHR_materials_emissive_strength
KHR_materials_volume
KHR_materials_sheen
KHR_materials_specular
KHR_materials_anisotropy
KHR_materials_ior
KHR_materials_variants
KHR_lights_punctual
KHR_texture_transform
KHR_mesh_quantization
EXT_mesh_gpu_instancing
Экспортировать (Export)
KHR_draco_mesh_compression
KHR_lights_punctual
KHR_materials_clearcoat
KHR_materials_transmission
KHR_materials_unlit
KHR_materials_emissive_strength
KHR_materials_volume
KHR_materials_sheen
KHR_materials_specular
KHR_materials_anisotropy
KHR_materials_ior
KHR_materials_variants
KHR_texture_transform
EXT_mesh_gpu_instancing
Third-party glTF Extensions¶
It is possible for Python developers to add Blender support for additional glTF extensions by writing their own third-party add-on, without modifying this glTF add-on. For more information, see the example on GitHub and if needed, register an extension prefix.
Пользовательские свойства¶
Custom properties are always imported, and will be exported from most objects
if the extras
field on the corresponding object in the glTF file.
Unlike glTF extensions, custom properties (extras) have no defined namespace, and may be used for any user-specific or application-specific purposes.
Animations¶
A glTF animation changes the transforms of objects or pose bones, or the values of shape keys. One animation can affect multiple objects, and there can be multiple animations in a glTF file.
Импортировать (Import)¶
Imported models are set up so that the first animation in the file is playing automatically. Scrub the Timeline to see it play.
When the file contains multiple animations, the rest will be organized using the Nonlinear Animation editor. Each animation becomes an action stashed to an NLA track. The track name is the name of the glTF animation. To make the animation within that track visible, click Solo (star icon) next to the track you want to play.
If an animation affects multiple objects, it will be broken up into multiple parts. The part of the animation that affects one object becomes an action stashed on that object. Use the track names to tell which actions are part of the same animation. To play the whole animation, you need to enable Solo (star icon) for all its tracks.
Примечание
There is currently no way to see the non-animated pose of a model that had animations.
You can also use the animation switcher that can be found in Dope Sheet editor.
Примечание
You have to enable UI in Add-on preferences for seeing the animation switcher
You can switch all animation imported. It automatically enables Solo (star icon) for all needed tracks. It also reset non animated object to Rest transformation.
Экспортировать (Export)¶
You can export animations using different ways. How glTF animations are made from actions / NLA is controlled by the
export option.Вариант (по умолчанию)¶
An action will be exported if it is the active action on an object, or it is stashed to an NLA track (e.g. with the Stash or Push Down buttons in the Action Editor). Actions which are not associated with an object in one of these ways are not exported. If you have multiple actions you want to export, make sure they are stashed!
A glTF animation can have a name, which is the action name by default. You can override it
by renaming its NLA track from NLATrack
/[Action Stash]
to the name you want to use.
For example, the Fig. fox model will export with three animations,
«Survey», «Walk», and «Run».
If you rename two tracks on two different objects to the same name, they will become part
of the same glTF animation and will play together.
The importer organizes actions so they will be exported correctly with this mode.
This mode is useful if you are exporting for game engine, with an animation library of a character. Each action must be on its own NLA track.
Активные действия объединены¶
In this mode, the NLA organization is not used, and only one animation is exported using the active actions on all objects.
NLA Треки¶
In this mode, each NLA Track will be export as an independent glTF animation. This mode is useful if you are using Strip modifiers, or if you get multiple action on a same Track.
If you rename two tracks on two different objects to the same name, they will become part of the same glTF animation and will play together.
Сцена (scene)¶
Using Scene option, animations will be exported as you can see them in viewport. You can choose to export a single glTF animation, or each object separately.
Примечание
Remember only certain types of animation are supported:
Преобразование объекта (расположение, вращение, масштаб)
Кости позы
Shape key values
Animation of other properties, like physics, lights, or materials, will be ignored.
Примечание
In order to sample shape key animations controlled by drivers using bone transformations, they must be on a mesh object that is a direct child of the bones“ armature.
Примечание
Only Actions (default) and Active Actions merged mode can handle not sampled animations.
File Format Variations¶
The glTF specification identifies different ways the data can be stored. The importer handles all of these ways. The exporter will ask the user to select one of the following forms:
glTF Binary (.glb
)¶
This produces a single .glb
file with all mesh data, image textures, and
related information packed into a single binary file.
Совет
Using a single file makes it easy to share or copy the model to other systems and services.
glTF Separate (.gltf
+ .bin
+ textures)¶
This produces a JSON text-based .gltf
file describing the overall structure,
along with a .bin
file containing mesh and vector data, and
optionally a number of .png
or .jpg
files containing image textures
referenced by the .gltf
file.
Совет
Having an assortment of separate files makes it much easier for a user to go back and edit any JSON or images after the export has completed.
Примечание
Be aware that sharing this format requires sharing all of these separate files together as a group.
glTF Embedded (.gltf
)¶
This produces a JSON text-based .gltf
file, with all mesh data and
image data encoded (using Base64) within the file. This form is useful if
the asset must be shared over a plain-text-only connection.
Предупреждение
This is the least efficient of the available forms, and should only be used when required. Available only when you activated it in addon preferences.
Свойства¶
Импортировать (Import)¶
- Pack Images
Pack all images into the blend-file.
- Объединить вершины
The glTF format requires discontinuous normals, UVs, and other vertex attributes to be stored as separate vertices, as required for rendering on typical graphics hardware. This option attempts to combine co-located vertices where possible. Currently cannot combine verts with different normals.
- Шейдинг (shading)
How normals are computed during import.
- Guess Original Bind Pose
Determines the pose for bones (and consequently, skinned meshes) in Edit Mode. When on, attempts to guess the pose that was used to compute the inverse bind matrices.
- Bone Direction
Changes the heuristic the importer uses to decide where to place bone tips. Note that the Fortune setting may cause inaccuracies in models that use non-uniform scaling. Otherwise this is purely aesthetic. The default value will not change axis, and is best for re-exporting from Blender. This default option will change display mode (adding shape and changing relationship line) to have a better view, even if original bones axis are not the most accurate (estheticaly speaking)
- Режим освещения
Optional backwards compatibility for non-standard render engines. Applies to lights. Standard: Physically-based glTF lighting units (cd, lx, nt). Unitless: Non-physical, unitless lighting. Useful when exposure controls are not available Raw (Deprecated): Blender lighting strengths with no conversion
- Импортировать текстуры WebP
If a texture exists in WebP format, loads the WebP texture instead of the fallback png/jpg one.
Экспортировать (Export)¶
- Формат (format)
See: File Format Variations.
- Сохранить оригинал
For glTF Separate file format only. Keep original textures files if possible. Warning: if you use more than one texture, where PBR standard requires only one, only one texture will be used. This can lead to unexpected results
- Текстуры (textures)
For glTF Separate file format only. Folder to place texture files in. Relative to the gltf-file.
- Copyright
Legal rights and conditions for the model.
- Remember Export Settings
Store export settings in the blend-file, so they will be recalled next time the file is opened.
Включить (include)¶
- Выделенные объекты
Export selected objects only.
- Visible Objects
Export visible objects only.
- Визуализируемые объекты
Export renderable objects only.
- Активная коллекция
Export objects from active collection only.
- Включить вложенные коллекции
Only when Active Collection is On. When On, export recursively objects on nested active collections.
- Активная сцена
Export active scene only.
- Пользовательские свойства
Export custom properties as glTF extras.
- Камеры (cameras)
Export cameras.
- Punctual Lights
Export directional, point, and spot lights. Uses the
KHR_lights_punctual
glTF extension.
Трансформировать (transform)¶
- Y Up
Export using glTF convention, +Y up.
Data - Scene Graph¶
- Образцы нодов геометрии
Export Geometry nodes instances. This feature is experimental.
- Экземпляры GPU
Export using
EXT_mesh_gpu_instancing
extensions.- Flatten Object Hierarchy
Useful in case of non-decomposable TRS matrix. Only skined meshes will stay children of armature.
- Иерархия всей коллекции
Export collections as empty, keeping full hierarchy. If an object is in multiple collections, it will be exported it only once, in the first collection it is found.
Data - Mesh¶
- Применить модификаторы
Экспортировать объекты, используя рассчитанный меш, то есть полученный меш после вычисления всех модификаторов.
- UVs
Export UVs (texture coordinates) with meshes.
- Нормали (normals)
Export vertex normals with meshes.
- Tangents
Export vertex tangents with meshes.
- Атрибуты (attributes)
Export Attributes with meshes, when the name starts with underscore.
- Свободные рёбра
Export loose edges as lines, using the material from the first material slot.
- Loose Points
Export loose points as glTF points, using the material from the first material slot.
- Shared Accessor
For triangles, use shared accessor for indices. This is more efficient (smaller files when you have lots of materials).
Data - Mesh - Vertex Color¶
- Use Vertex Color
- Материал (material):
Export vertex color when used in material node tree as Base Color multiplier. This is the default, and the most accurate regarding glTF specification.
- Активный (active):
Export active vertex colors, even if not used in material node tree. A fully compliant glTF viewer should display this VC as Base Color multiplier.
- Нет (none):
Не экспортирует цвет вершин.
- Экспорт всех цветов вершин
Export all vertex colors, additional VC will be COLOR_1, COLOR_2, etc.
- Export active vertex color when no material
Export active vertex color when no material is assigned to the object.
Данные - Материал¶
- Материалы (materials)
Export full materials, only placeholders (all primitives but without materials), or does not export materials. (In that last case, primitives are merged, losing material slot information).
- Изображения
Output format for images. PNG is lossless and generally preferred, but JPEG might be preferable for web applications due to the smaller file size. If WebP is chosen, all textures will be saved as WebP, without any png/jpg fallback. If None is chosen, materials are exported without textures.
- Качество изображения
When exporting jpeg or WebP files, the quality of the exported file.
- Create WebP
Creates WebP textures for every textures, in addition to the existing texture. For already WebP textures, nothing happen.
- WebP fallback
For all WebP textures, create a png fallback texture.
- Неиспользованные изображения
Export images that are not used in any material.
- Неиспользованные текстуры
Export texture info (sampler, image, texcoord) that are not used in any material.
Data - Shape Keys¶
Export shape keys (morph targets).
- Shape Key Normals
Export vertex normals with shape keys (morph targets).
- Shape Key Tangents
Export vertex tangents with shape keys (morph targets).
Data - Shape Keys - Optimize¶
- Use Sparse Accessor if better
Sparse Accessor will be used if it save space (if the exported file is smaller)
- Omitting Sparse Accessor if data is empty
If data is empty, omit to export SParce Accessor. Not all viewer managed it correctly, so this option is Off by default
Данные - Арматура¶
- Используйте арматуру в исходном положении (Rest Position)
Export Armatures using rest position as joint rest pose. When Off, the current frame pose is used as rest pose.
- Export Deformation Bones only
Export Deformation bones only, not other bones. Animation for deformation bones are baked.
- Remove Armature Object
Remove Armature Objects if possible. If some armature(s) have multiple root bones, we can’t remove them.
- Flatten Bone Hierarchy
Useful in case of non-decomposable TRS matrix.
Data - Skinning¶
Export skinning data
- Влияния костей
How many joint verex influences will be exported. Models may appear incorrectly in many viewers with value different to 4 or 8.
- Include All Bone Influences
Export all joint vertex influences. Models may appear incorrectly in many viewers.
Data - Lighting¶
- Режим освещения
Optional backwards compatibility for non-standard render engines. Applies to lights. Standard: Physically-based glTF lighting units (cd, lx, nt). Unitless: Non-physical, unitless lighting. Useful when exposure controls are not available Raw (Deprecated): Blender lighting strengths with no conversion
Данные - Сжатие¶
Compress meshes using Google Draco.
- Compression Level
Higher compression results in slower encoding and decoding.
- Quantization Position
Higher values result in better compression rates.
- Нормаль (normal)
Higher values result in better compression rates.
- Texture Coordinates
Higher values result in better compression rates.
- Цвет (color)
Higher values result in better compression rates.
- Общий (generic)
Higher values result in better compression rates.
Анимация (animation)¶
- Режим анимации
Animation mode used for export (See Animations )
- Анимации ключевых форм (Shape Keys Animations)
Export Shape Keys Animation. Need Shape Keys to be exported (See Data - Shape Keys)
- Запекание анимаций всех объектов
Useful when some objects are constrained without being animated themselves.
Анимация - Покой & Диапазоны¶
- Use Current Frame as Object Rest Transformations
Export the scene in the current animation frame. When off, frame 0 is used as rest transformation for objects.
- Limit to Playback Range
Clips animations to selected playback range.
- Set all glTF Animation starting at 0
Set all glTF Animation starting at 0. Can be useful for looping animation
- Негативные (-) кадры
When some frames are in negative range, slide or crop the animation.
Анимация - Арматура¶
- Export all Armature Actions
Export all actions, bound to a single armature. Warning: Option does not support exports including multiple armatures.
- Reset pose bones between actions
Reset pose bones between each action exported. This is needed when some bones are not keyed on some animations.
Анимация - Выборка (Sampling)¶
Apply sampling to all animations. Do not sample animation can lead to wrong animation export.
- Частота выборки
How often to evaluate animated values (in frames).
Анимация - Оптимизация¶
- Оптимизация размера анимации
Reduce exported file size by removing duplicate keyframes when all identical.
- Force keeping channel for armature / bones
if all keyframes are identical in a rig, force keeping the minimal animation.
- Force keeping channel for objects
if all keyframes are identical for object transformations, force keeping the minimal animation.
- Отключить вьюпорт для других объектов
When exporting animations, disable viewport for other objects, for performance reasons, when possible.
Анимация - Фильтр¶
Restrict actions to be exported to the ones matching the filter.
Contributing¶
This importer/exporter is developed through the glTF-Blender-IO repository, where you can file bug reports, submit feature requests, or contribute code.
Discussion and development of the glTF 2.0 format itself takes place on the Khronos Group glTF GitHub repository, and feedback there is welcome.