# What are 3D model loaders? ### glTF (GL Transmission Format) Where possible, we recommend using glTF (GL Transmission Format). Both .GLB and .GLTF versions of the format are well supported. Because glTF is focused on runtime asset delivery, it is compact to transmit and fast to load. Features include meshes, materials, textures, skins, skeletons, morph targets, animations, lights, and cameras. Public-domain glTF files are available on sites like [Sketchfab](https://sketchfab.com/models?features=downloadable\&sort_by=-likeCount\&type=models), or various tools include glTF export: * [Blender](https://www.blender.org/) by the Blender Foundation * [Substance Painter](https://www.allegorithmic.com/products/substance-painter) by Allegorithmic * [Modo](https://www.foundry.com/products/modo) by Foundry * [Toolbag](https://www.marmoset.co/toolbag/) by Marmoset * [Houdini](https://www.sidefx.com/products/houdini/) by SideFX * [Cinema 4D](https://labs.maxon.net/?p=3360) by MAXON * [COLLADA2GLTF](https://github.com/KhronosGroup/COLLADA2GLTF) by the Khronos Group * [FBX2GLTF](https://github.com/facebookincubator/FBX2glTF) by Facebook * [OBJ2GLTF](https://github.com/AnalyticalGraphicsInc/obj2gltf) by Analytical Graphics Inc * …and [many more](http://github.khronos.org/glTF-Project-Explorer/) When glTF is not an option, popular formats such as FBX, OBJ, or COLLADA are also available and regularly maintained by many libraries. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://www.xrdev.app/mixed-reality-docs/webxr-lessons/3d-on-the-web/concepts/what-are-3d-model-loaders.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.