# Latest **URL:** https://forum.aousd.org/latest.md [Latest](https://forum.aousd.org/latest.md) · [Categories](https://forum.aousd.org/categories.md) · [Tags](https://forum.aousd.org/tags.md) --- ## [HdStorm + Vulkan + Qt QML](https://forum.aousd.org/t/hdstorm-vulkan-qt-qml/3041)
**Author:** [@andreagenor](https://forum.aousd.org/u/andreagenor)\ **Replies:** 5\ **Last updated:** [September 15, 2026, 3:04am UTC](https://forum.aousd.org/t/hdstorm-vulkan-qt-qml/3041 "2026-09-15T03:04:29Z")
Hi, We’re building a USD/Hydra viewer that integrates HdStorm with Qt QML/QtQuick via Vulkan. Our current architecture: Device ownership: HgiVulkan creates the unique VkDevice/VkInstance/VkPhysicalDevice AOV handoff: … --- ## [Proposal: Release branches in OpenUSD GitHub repository](https://forum.aousd.org/t/proposal-release-branches-in-openusd-github-repository/3043)
**Author:** [@sunya](https://forum.aousd.org/u/sunya)\ **Replies:** 0\ **Last updated:** [September 14, 2026, 5:24pm UTC](https://forum.aousd.org/t/proposal-release-branches-in-openusd-github-repository/3043 "2026-09-14T17:24:09Z")
Hi all, I’ve posted a new proposal on OpenUSD-proposals for adding release branches in the OpenUSD repository for each release, instead of relying on a single release branch and tags on that branch to label releases. Th… --- ## [Ramp UI hint questions](https://forum.aousd.org/t/ramp-ui-hint-questions/2978)
**Author:** [@James](https://forum.aousd.org/u/James)\ **Replies:** 7\ **Last updated:** [September 9, 2026, 3:12pm UTC](https://forum.aousd.org/t/ramp-ui-hint-questions/2978 "2026-09-09T15:12:54Z")
UI Hints for Ramps Background The recently introduced UI Hints have provided a unified and consistent way of describing potentially complex authoring interfaces which has significantly helped in providing consistent inte… --- ## [Generating New Schema Classes Unknown CMake command "pxr\_plugin"](https://forum.aousd.org/t/generating-new-schema-classes-unknown-cmake-command-pxr-plugin/3035)
**Author:** [@Subin](https://forum.aousd.org/u/Subin)\ **Replies:** 1\ **Last updated:** [September 5, 2026, 12:25am UTC](https://forum.aousd.org/t/generating-new-schema-classes-unknown-cmake-command-pxr-plugin/3035 "2026-09-05T00:25:10Z")
Hi everyone, I’m currently experiencing an error in Generating New Schema Classes and haven’t been able to resolve it. Has anyone encountered a similar issue or knows what might be causing it? Build the custom schema p… --- ## [Animation slow initial playthrough](https://forum.aousd.org/t/animation-slow-initial-playthrough/3034)
**Author:** [@Iciar](https://forum.aousd.org/u/Iciar)\ **Replies:** 4\ **Last updated:** [September 1, 2026, 12:47am UTC](https://forum.aousd.org/t/animation-slow-initial-playthrough/3034 "2026-09-01T00:47:58Z")
Hello! I have been working on ways to load and handle USD data in Maya and I have noticed that when I load a USD file that contains some animation the first playthrough always runs slow (lower fps) and then the rest of … --- ## [Using LOD support for Materials?](https://forum.aousd.org/t/using-lod-support-for-materials/3033)
**Author:** [@deadpin](https://forum.aousd.org/u/deadpin)\ **Replies:** 4\ **Last updated:** [August 31, 2026, 10:32pm UTC](https://forum.aousd.org/t/using-lod-support-for-materials/3033 "2026-08-31T22:32:34Z")
Is there such a thing as using the LOD schema purely for material bindings? Like switching between an expensive procedural material, when geometry is close, to a cheap low-resolution pre-baked material when far away (whi… --- ## [Dot Nodes in NodeGraph](https://forum.aousd.org/t/dot-nodes-in-nodegraph/2937)
**Author:** [@James](https://forum.aousd.org/u/James)\ **Replies:** 25\ **Last updated:** [August 31, 2026, 4:31pm UTC](https://forum.aousd.org/t/dot-nodes-in-nodegraph/2937 "2026-08-31T16:31:44Z")
Hey USD people! A bit of a long one, so TLDR: we would like to propose encode a “dot” node in a NodeGraph; below are some options and reasonings. We’ve been looking into the UsdShade space of USD and noticed that altho… --- ## [Known file size limitations for usdzip?](https://forum.aousd.org/t/known-file-size-limitations-for-usdzip/2424)
**Author:** [@wave](https://forum.aousd.org/u/wave)\ **Replies:** 12\ **Last updated:** [August 31, 2026, 8:06am UTC](https://forum.aousd.org/t/known-file-size-limitations-for-usdzip/2424 "2026-08-31T08:06:48Z")
Consider the Animal Logic ALab asset. If you isolate the “stoat” character thusly: usdcat --flatten -o stoat.usd --mask /root/stoat/body\_M\_hrc entry.usda You get a file that renders fine in usdview and is almost 16GB (… --- ## [How to dynamically cast \`TfAnyWeakPtr\`?](https://forum.aousd.org/t/how-to-dynamically-cast-tfanyweakptr/3025)
**Author:** [@maddy-adams](https://forum.aousd.org/u/maddy-adams)\ **Replies:** 1\ **Last updated:** [August 28, 2026, 6:28pm UTC](https://forum.aousd.org/t/how-to-dynamically-cast-tfanyweakptr/3025 "2026-08-28T18:28:41Z")
Given a TfAnyWeakPtr, is there a way to dynamically cast it to a typed TfWeakPtr\? pxr/base/tf/anyWeakPtr.h declares templated method TfAnyWeakPtrDynamicCast, but I can’t see a definition for it anywhere in the OpenUSD… --- ## [Introducing Roji: An End-to-End OpenUSD Workflow for Scene Assembly, Look Development, Lighting and Rendering](https://forum.aousd.org/t/introducing-roji-an-end-to-end-openusd-workflow-for-scene-assembly-look-development-lighting-and-rendering/3028)
**Author:** [@RABIA](https://forum.aousd.org/u/RABIA)\ **Replies:** 0\ **Last updated:** [August 27, 2026, 4:16pm UTC](https://forum.aousd.org/t/introducing-roji-an-end-to-end-openusd-workflow-for-scene-assembly-look-development-lighting-and-rendering/3028 "2026-08-27T16:16:06Z")
Hi everyone, I’m Rabia Rahou, founder of Roji Research, I’m developing Roji, an end-to-end OpenUSD environment that brings scene assembly, look development, lighting, interactive review and rendering into one connected… --- ## [Clarification on Hd...SentinelTokens-\>container usage](https://forum.aousd.org/t/clarification-on-hd-sentineltokens-container-usage/3019)
**Author:** [@robp\_sidefx](https://forum.aousd.org/u/robp_sidefx)\ **Replies:** 2\ **Last updated:** [August 25, 2026, 7:34am UTC](https://forum.aousd.org/t/clarification-on-hd-sentineltokens-container-usage/3019 "2026-08-25T07:34:57Z")
In reading the header for HdDataSourceLocatorSentinelTokens-\>container I’m a bit confused about why all nested invalidation is necessary. /// HdDataSourceLocatorSentinelTokens-\>container indicates that /// the container… --- ## [Why SdfSchemaBase and SdfSchema?](https://forum.aousd.org/t/why-sdfschemabase-and-sdfschema/3023)
**Author:** [@maddy-adams](https://forum.aousd.org/u/maddy-adams)\ **Replies:** 1\ **Last updated:** [August 25, 2026, 12:57am UTC](https://forum.aousd.org/t/why-sdfschemabase-and-sdfschema/3023 "2026-08-25T00:57:28Z")
Why are SdfSchemaBase and SdfSchema different classes? Is this just a historical artifact, or is there a reason they can’t be merged/treated as the same? Are there other classes in OpenUSD that derive from SdfSchemaBas… --- ## [Hydra Render Delegate changing Scene Index etiquette](https://forum.aousd.org/t/hydra-render-delegate-changing-scene-index-etiquette/3022)
**Author:** [@James](https://forum.aousd.org/u/James)\ **Replies:** 1\ **Last updated:** [August 24, 2026, 8:28am UTC](https://forum.aousd.org/t/hydra-render-delegate-changing-scene-index-etiquette/3022 "2026-08-24T08:28:56Z")
Hey, I had some (hopefully) quick questions about the etiquette and roles a Scene Index (and the owner of such scene indices) and the behaviour whilst switching between two render delegates whilst not changing the scene… --- ## [Single-element primvar declaration](https://forum.aousd.org/t/single-element-primvar-declaration/3020)
**Author:** [@mreinhard](https://forum.aousd.org/u/mreinhard)\ **Replies:** 2\ **Last updated:** [August 18, 2026, 8:44pm UTC](https://forum.aousd.org/t/single-element-primvar-declaration/3020 "2026-08-18T20:44:02Z")
Hello, I’d like to ask for a simple clarification when declaring primvars with constant interpolation: The user guide says “Note that you still need to provide an array (that contains a single element) for the primvar.… --- ## [Renaming BackPlateSchema's Color Correcting Properties](https://forum.aousd.org/t/renaming-backplateschemas-color-correcting-properties/3018)
**Author:** [@denisey](https://forum.aousd.org/u/denisey)\ **Replies:** 0\ **Last updated:** [August 5, 2026, 12:06am UTC](https://forum.aousd.org/t/renaming-backplateschemas-color-correcting-properties/3018 "2026-08-05T00:06:16Z")
Hello All Regarding the back plate schema, we plan to change the following color correction properties in accordance with the ASC-CDL specification to make these properties more interchangeable with various systems and … --- ## [Usdstitch attribute interpolation bug?](https://forum.aousd.org/t/usdstitch-attribute-interpolation-bug/3016)
**Author:** [@ocastle](https://forum.aousd.org/u/ocastle)\ **Replies:** 4\ **Last updated:** [August 4, 2026, 5:13am UTC](https://forum.aousd.org/t/usdstitch-attribute-interpolation-bug/3016 "2026-08-04T05:13:14Z")
Hello USD people, We have run into what seems like should be a simple issue when using usdstitch to combine the animated output from several individual usd files, each exported from maya over a series of consecutive fra… --- ## [USD UV Map breaking](https://forum.aousd.org/t/usd-uv-map-breaking/3014)
**Author:** [@sgreen](https://forum.aousd.org/u/sgreen)\ **Replies:** 2\ **Last updated:** [August 1, 2026, 4:47pm UTC](https://forum.aousd.org/t/usd-uv-map-breaking/3014 "2026-08-01T16:47:46Z")
Hi, I’m attempting to streamline an ‘easy’ pipeline process for my thesis film and I’m learning more about .usd files when exporting for lighting/render. However, when I import my usd files, there doesn’t appear to be a… --- ## [( Hydra 1.0 ) Moving one native instance recomputes transforms for every nested instance](https://forum.aousd.org/t/hydra-1-0-moving-one-native-instance-recomputes-transforms-for-every-nested-instance/3011)
**Author:** [@hamed](https://forum.aousd.org/u/hamed)\ **Replies:** 0\ **Last updated:** [July 28, 2026, 4:22pm UTC](https://forum.aousd.org/t/hydra-1-0-moving-one-native-instance-recomputes-transforms-for-every-nested-instance/3011 "2026-07-28T16:22:04Z")
Hi, I have a fundamental question regarding native instancing in Hydra 1.0. Specs: Maya USD 0.33.0 OpenUSD 25.11 Windows I have an asset that are built out of instanceable sub-pieces, and those assets then get inst… --- ## [Replacing sentinel fallback values with None in schema definitions](https://forum.aousd.org/t/replacing-sentinel-fallback-values-with-none-in-schema-definitions/2973)
**Author:** [@andrew](https://forum.aousd.org/u/andrew)\ **Replies:** 6\ **Last updated:** [July 27, 2026, 5:28pm UTC](https://forum.aousd.org/t/replacing-sentinel-fallback-values-with-none-in-schema-definitions/2973 "2026-07-27T17:28:56Z")
We’re exploring using None as an explicit schema fallback value as an alternative to sentinel values (-inf, -1) in 3rd party schema definitions. We want to check whether this is a supported/recommended pattern before ado… --- ## [Proxy-purpose only DrawMode](https://forum.aousd.org/t/proxy-purpose-only-drawmode/3010)
**Author:** [@mreinhard](https://forum.aousd.org/u/mreinhard)\ **Replies:** 4\ **Last updated:** [July 25, 2026, 12:01pm UTC](https://forum.aousd.org/t/proxy-purpose-only-drawmode/3010 "2026-07-25T12:01:08Z")
Hello, I am having difficulties to wrap my head around the drawMode system. My goal is to have a card representation for our assets. The assets can be composed of different parts, so ideally the drawMode and the cards … --- ## [Profiles proposal: Can a base profile describe a non-rendering domain?](https://forum.aousd.org/t/profiles-proposal-can-a-base-profile-describe-a-non-rendering-domain/3003)
**Author:** [@JosephIbrahim](https://forum.aousd.org/u/JosephIbrahim)\ **Replies:** 3\ **Last updated:** [July 20, 2026, 9:51pm UTC](https://forum.aousd.org/t/profiles-proposal-can-a-base-profile-describe-a-non-rendering-domain/3003 "2026-07-20T21:51:47Z")
Hi there! First time caller here. Long-time USD user on the DCC/Solaris side. I’ve read the Profiles proposal (merged in OpenUSD-proposals: OpenUSD-proposals/proposals/profiles at main · PixarAnimationStudios/OpenUSD… --- ## [OpenUSD v26.08 has been released!](https://forum.aousd.org/t/openusd-v26-08-has-been-released/3004)
**Author:** [@sunya](https://forum.aousd.org/u/sunya)\ **Replies:** 0\ **Last updated:** [July 20, 2026, 2:35pm UTC](https://forum.aousd.org/t/openusd-v26-08-has-been-released/3004 "2026-07-20T14:35:11Z")
Hello! OpenUSD v26.08 has just been published on GitHub. Please see the release notes below for more details on what’s new. For those of you attending SIGGRAPH, we hope to see you at our BoF at 10:00 AM! Sunya --- ## [Separate proxy/render purpose hierarchys - but shared Xforms between them?](https://forum.aousd.org/t/separate-proxy-render-purpose-hierarchys-but-shared-xforms-between-them/2872)
**Author:** [@PhilS](https://forum.aousd.org/u/PhilS)\ **Replies:** 7\ **Last updated:** [July 15, 2026, 6:17pm UTC](https://forum.aousd.org/t/separate-proxy-render-purpose-hierarchys-but-shared-xforms-between-them/2872 "2026-07-15T18:17:02Z")
Hey all, We have been diligently observing the advice found at assets/docs/asset-structure-guidelines.md at main · usd-wg/assets · GitHub Basically for each model geo prim, maintain a separate child render and proxy sco… --- ## [Component-level render/proxy display purpose swapping?](https://forum.aousd.org/t/component-level-render-proxy-display-purpose-swapping/2998)
**Author:** [@jonahjnewton](https://forum.aousd.org/u/jonahjnewton)\ **Replies:** 2\ **Last updated:** [July 15, 2026, 5:13am UTC](https://forum.aousd.org/t/component-level-render-proxy-display-purpose-swapping/2998 "2026-07-15T05:13:36Z")
Hey all, We’ve encountered a use-case in which an artist needs to view the render-purpose representation of a specific asset, but we want to be able to keep the performance benefits of having the rest of the loaded Set … --- ## [OpenUSD v26.08 release candidate now available on GitHub](https://forum.aousd.org/t/openusd-v26-08-release-candidate-now-available-on-github/2997)
**Author:** [@sunya](https://forum.aousd.org/u/sunya)\ **Replies:** 0\ **Last updated:** [July 14, 2026, 9:09pm UTC](https://forum.aousd.org/t/openusd-v26-08-release-candidate-now-available-on-github/2997 "2026-07-14T21:09:03Z")
Hi all, The release candidate for OpenUSD v26.08 has been published on GitHub under the v26.08-rc1 tag. The CHANGELOG for the release is available below. Version 26.08 is scheduled for release next Monday, July 20th. P… --- ## [USD-X3D File Translator](https://forum.aousd.org/t/usd-x3d-file-translator/2972)
**Author:** [@aaronbergstrom](https://forum.aousd.org/u/aaronbergstrom)\ **Replies:** 3\ **Last updated:** [July 14, 2026, 4:41pm UTC](https://forum.aousd.org/t/usd-x3d-file-translator/2972 "2026-07-14T16:41:01Z")
USD-X3D File Translator Update Ryker, a student employee of mine at the UND DREAM Lab (an AOUSD Contributing Member), has been developing a C++ language binding library based on the C++ X3D SAI spec (ISO 19777-4 X3DCPPS… --- ## [OpenUSD v26.08-alpha preview available on GitHub](https://forum.aousd.org/t/openusd-v26-08-alpha-preview-available-on-github/2980)
**Author:** [@sunya](https://forum.aousd.org/u/sunya)\ **Replies:** 0\ **Last updated:** [July 9, 2026, 6:54pm UTC](https://forum.aousd.org/t/openusd-v26-08-alpha-preview-available-on-github/2980 "2026-07-09T18:54:59Z")
Hi all, Internal QA testing has begun for the upcoming OpenUSD 26.08 release. The code being tested is available on the dev branch on GitHub under the v26.08-alpha label. We’re on a bit of a tighter schedule than typic… --- ## [In memory USDA Generation of a UsdShadeMaterial and all of it's children](https://forum.aousd.org/t/in-memory-usda-generation-of-a-usdshadematerial-and-all-of-its-children/2974)
**Author:** [@evanburkert](https://forum.aousd.org/u/evanburkert)\ **Replies:** 4\ **Last updated:** [July 9, 2026, 3:14pm UTC](https://forum.aousd.org/t/in-memory-usda-generation-of-a-usdshadematerial-and-all-of-its-children/2974 "2026-07-09T15:14:45Z")
What is the best way to generate an in memory usda representation of an existing UsdShadeMaterial, all of it’s connectables/attributes/metadata and it’s UsdShadeShader children without creating a new stage and exporting … --- ## [NVIDIA Omniverse Extension: Scan to USD](https://forum.aousd.org/t/nvidia-omniverse-extension-scan-to-usd/2977)
**Author:** [@Finger](https://forum.aousd.org/u/Finger)\ **Replies:** 0\ **Last updated:** [July 8, 2026, 2:45pm UTC](https://forum.aousd.org/t/nvidia-omniverse-extension-scan-to-usd/2977 "2026-07-08T14:45:25Z")
The source code for the FindSurface demo app for NVIDIA Omniverse is now publicly available on CurvSurf GitHub. A sample project for NVIDIA Omniverse platforms that searches point clouds for geometries. --- ## [Scenegraph instancing importing](https://forum.aousd.org/t/scenegraph-instancing-importing/2770)
**Author:** [@BigRayLee](https://forum.aousd.org/u/BigRayLee)\ **Replies:** 3\ **Last updated:** [July 8, 2026, 11:15am UTC](https://forum.aousd.org/t/scenegraph-instancing-importing/2770 "2026-07-08T11:15:18Z")
Hi, I’m working on importing USD assets into our software. For handling scene graph instancing, since the prototype prim is generated at runtime, we want its prototype identifier to remain consistent every time the scen… [Next page](https://forum.aousd.org/latest.md?page=1)