crabtree o3dv post

_posts/2024-09-05-o3dv.md

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+---
+layout: post
+title: '3D Viewer for Crabtree project'
+subtitle:
+author: Evan Williamson
+publish-date: Sep 5, 2024
+tags: [tech, cb-add-on]
+short_description: 'Using o3dv to present 3D models of artifacts in a CB-CSV project.'
+---
+
+At University of Idaho Library we have recently been wrapping up the "Donald E. Crabtree Lithic Technology Collection" project by creating the new [digital collection website](https://www.lib.uidaho.edu/digital/crabtree/).
+
+{% include feature/image.html objectid="https://objects.lib.uidaho.edu/crabtree/crabtree-banner.jpg" alt="lithic point of colorful stone" link="https://www.lib.uidaho.edu/digital/crabtree/" %}
+
+Supported by a [Digitizing Hidden Collections grant](https://www.clir.org/hiddencollections/), this complex multi-year project involved digitizing thousands of archival objects *and* flitknapped artifacts ([learn more on the About page](https://www.lib.uidaho.edu/digital/crabtree/about.html)).
+Each artifact was carefully photographed from multiple angles following a standardized procedure, including a unique [GGOI process](https://www.lib.uidaho.edu/digital/crabtree/digitization.html) to enable extremely shiny lithic surfaces to be captured in detail.
+A smaller group was selected for [3D Photogrammetry](https://awbla.github.io/awbla-student-workflow/content/3-photogrammetry.html), where dozens of overlapping images of an object are taken with 360 degree rotation, and then processed with software to generate 3D models (using Agisoft Metashape).
+
+With thousands of images and hundreds of 3D model files (and accompanying metadata), it was time to make this fascinating content available via a customized CollectionBuilder-CSV website.
+
+CB-CSV has one basic built in 3D model viewer option ("_includes/item/3d-model-viewer.html" using [model-viewer](https://modelviewer.dev/)) that supports GLB or GLTF models out of the box. 
+However, our items had OBJ, STL, and X3D models only, and I had little desire to bulk convert all to generate new formats!
+
+After testing a variety of javascript libraries and frameworks for presenting 3D models on static sites (including [3DHOP](https://www.3dhop.net/), [cgwire](https://github.com/cgwire/js-3d-model-viewer), and [threejs](https://threejs.org)) I settled on [Online 3D Viewer (o3dv)](https://github.com/kovacsv/Online3DViewer) because it worked well and supports a wide variety of model formats.
+You can test out their fully featured viewer at [3dviewer.net](https://3dviewer.net/).
+
+I set up the basic implementation of o3dv and shared it as a "cb-add-on" repository, [o3dv_cb-add-on](https://github.com/CollectionBuilder/o3dv_cb-add-on).
+These "cb-add-on" repositories are packages of libraries, includes, and layouts to add new features into CB-CSV--download the code and drop it into your CB-CSV project!
+
+For Crabtree collection, I started from that basic implementation and created a custom layout for our artifact items.
+Each artifact could have some 2D photographs and/or some 3D model files, so the challenge is to present all those options in a consistent item page. 
+It incorporates a "gallery" feature for the 2D photographs.
+If 3D models are available, it adds a "View 3D Model" button which opens a [full screen modal](https://getbootstrap.com/docs/5.3/components/modal/#fullscreen-modal) to display the 3D viewer.
+Loading the model with o3dv is handled by javascript, allowing us to change models and remove them when the modal is closed.
+
+Try it out in this example, [Ce. 1890](https://www.lib.uidaho.edu/digital/crabtree/items/ce_cd_d4_1890_model.html)
+
+{% include feature/image.html objectid="https://objects.lib.uidaho.edu/crabtree/small/ce_cd_d4_1890-a_sm.jpg" link="https://www.lib.uidaho.edu/digital/crabtree/items/ce_cd_d4_1890_model.html" alt="flintnapped point with fluted edges" %}
+
+The source code is available at [thecdil/crabtree_source](https://github.com/thecdil/crabtree_source).