Questions tagged [gltf]

The GL Transmission Format (glTF) is a runtime asset delivery format for GL APIs: WebGL, OpenGL ES, and OpenGL. glTF bridges the gap between 3D content creation tools and modern GL applications by providing an efficient, extensible, interoperable format for the transmission and loading of 3D content.

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How to apply transformation matrices from multiple primitives on a mesh

I'm working on some code to convert a 3d geometry from IFC to gltf/glb. One of the challenges I'm facing with this is that - IFC provides transformations for each primitive separately i.e., if I have ...
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Starting from a basic glTF (such as a static sphere or plane) exported from Blender how can I add an animation manipulating its JSON?

I'm working on a glTF, precisely I'm trying to animate a "static" mesh exported from Blender directly acting on its JSON. In doing so, I'm following the logic used in this tutorial , where a ...
1 vote
1 answer
64 views

How to apply a linear transformation to gltf data

I am trying to transform the mesh data in a gltf file and then modify the skin and animation data accordingly. Let's say we want to transform the data using a 4x4 homogeneous matrix. For ...
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2 votes
1 answer
35 views

Inspecting gltf animation data

I am trying to load gltf data onto an engine I am making and I am noticing that something is wrong with the rotations. I want to be able to see the raw numeric values of the animation data in the gltf ...
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0 votes
0 answers
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Appending animations of different rigs?

I have a gltf model that is fully rigged, I have a few animation files also in gltf. Is there a way for me to retarget the animations in the animation files to the rigged model? The positions of the ...
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0 votes
1 answer
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Uploading interleaved data in gltf buffers

Suppose a GLTF file provides a single N byte buffer which includes all vertex data for multiple meshes. The first m bytes are ...
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2 votes
1 answer
83 views

When and who introduced the idea of a scene graph?

Simple question: is there a source that precedes the idea of presenting graphical application or 3D scene in a scene graph? I came across Hierarchical geometric models for visible surface algorithms ...
1 vote
1 answer
44 views

Why are these 2 buffers joint while extracting glTF information?

I am using tinyGLTF to parse gltf files and then render them in my program. I am currently during the third example in this page. In particular I am trying to extract the 2 animation buffers: My code:...
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2 votes
1 answer
140 views

What's the simplest, open, animation format?

I have an obj parser that handles triangle meshes specifically. I want to extend it (and the rest of my system) to handle animations as well. However, I don't think I am ready to tackle the glTF ...
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2 votes
1 answer
701 views

Determining the Bounding Box values of a glTF file

Is there a way when looking at the source of a glTF file that you can determine what the boundingBox values of the object are?
4 votes
3 answers
4k views

Programmatically generating bin files for GLTF models

I have a need to generate a series of GLB files. I have a base template for a GLTF file which I have to derive off of. The models thus generated will only have varying textures on them. The base mesh ...
1 vote
2 answers
403 views

Convert a .X mesh to a modern format

I have a bunch of meshes in the .X format, which isn't supported by many 3D applications today. Therefore, I would like to convert these to a modern format like fbx or gltf/glb. Since these meshes ...
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1 answer
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glTF animation keyframe question

I have an animated cube with 5 keyframes and when I export it to glTF with blender, in the file I can only see 3 keyframes: But when I viewed the gltf model with viewer all 5 keyframes worked well ...
2 votes
1 answer
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How mesh geometry data (vertex coordinates) stored in glTF?

I've read the reference guide about the file but I am really confused. Why the hell are there "min" and "max" values ?? A single vertex has only one coordinate array not min and max.. Also in the ...
4 votes
2 answers
4k views

How to encode/decode buffer data in glTF?

I'm playing around with base64 embedded data URI's and tried to analyze the buffer data of the gltf box sample model, as defined in this example here (line 76). ...
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3 votes
2 answers
1k views

How to generate binary gltf array buffers?

I'm looking for any way which enables me to quickly generate gltf files including the conversion of plain array buffers (vertex, index, color, etc.) into binary (bgltf, glb, bin) files. I'm asking ...
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4 votes
2 answers
1k views

Is it possible to store the plain buffer data in gltf files?

The GL Transmission Format comes along with a JSON styled main file which basicly describes the scene and binary files which contain the buffers. I'm currently writing a WebGL library and I need to ...
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5 votes
3 answers
3k views

Is it possible to create minimal glTF files with vertex and index buffers?

I am currently looking into glTF to use as a transfer format for my WebGL project. I already have the geometries I wish to render on my WebGL client available as preprocessed vertex and index buffers (...
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3 votes
2 answers
4k views

Are there any gltf example datasets available? [closed]

I'm currently researching my options on effeciently exchanging data for a webgl application. I understand the gltf format is still being drafted but I need some example data to understand whether this ...
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