F3D vs p3d.in

F3D is free software for viewing 3D data, browsing models, and generating renderings. It supports lighting and materials for realistic rendering, animations with GPU-accelerated skinning for character rigs, and visualization tasks such as CAD, Gaussian splatting, volume rendering, and scientific work. Its supported formats include VTK, STL, DICOM, STEP, OBJ, glTF, FBX, USD, IFC, and Gaussian splat files, among many others. Packages are available for Windows, macOS, Linux, and Android, and a browser viewer can open or accept dropped files and provides rendering and display controls. Developers can use a Python package, a beta JavaScript/WebAssembly package, or the libf3d C++ library with Python and Java bindings. F3D is distributed under the BSD 3-Clause License. Some capabilities have specific limits: FBX PBR materials and Alembic materials are unsupported, while Gaussian splatting requires OpenGL 4.3, which macOS does not support. Documentation also says volume rendering and HDRI need a decent GPU. Plugins can vary by package.

p3d.in is an online 3D model-sharing platform and community for animation and visualization projects. Models open in modern browsers without plugins and can be shared by link or embedded on websites with configurable viewer settings. Upload support includes OBJ with MTL files and textures, while the listed formats also include glTF, GLB, FBX, and STL. Hotspots can mark details, move the camera, show descriptions, control animations, and contain nested hotspots. Variants can hide or show model parts for different configurations, including product configurators described as requiring no coding. Compatible models can be viewed in augmented reality through a suitable Android or iOS camera without another app. Models may be public, unlisted, or private; unlisted links can be viewed by anyone with the URL, while private models are owner-only. Plus and higher accounts can use the JavaScript Embed API to control animations, textures, variants, camera movement, and hotspots in web apps. Basic is free with 100MB storage and model size. Plus costs $6 a month, and Premium costs $50 a month.