OPCFoundation.NetStandard.Opc.Ua.Vision.OpenUsd 2.0.0-preview.4

Prefix Reserved
.NET 8.0 This package targets .NET 8.0. The package is compatible with this framework or higher.
This is a prerelease version of OPCFoundation.NetStandard.Opc.Ua.Vision.OpenUsd. 
dotnet add package OPCFoundation.NetStandard.Opc.Ua.Vision.OpenUsd --version 2.0.0-preview.4
                    


                    

                
NuGet\Install-Package OPCFoundation.NetStandard.Opc.Ua.Vision.OpenUsd -Version 2.0.0-preview.4
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="OPCFoundation.NetStandard.Opc.Ua.Vision.OpenUsd" Version="2.0.0-preview.4" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="OPCFoundation.NetStandard.Opc.Ua.Vision.OpenUsd" Version="2.0.0-preview.4" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="OPCFoundation.NetStandard.Opc.Ua.Vision.OpenUsd" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add OPCFoundation.NetStandard.Opc.Ua.Vision.OpenUsd --version 2.0.0-preview.4
                    


                    

                
#r "nuget: OPCFoundation.NetStandard.Opc.Ua.Vision.OpenUsd, 2.0.0-preview.4"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
#:package OPCFoundation.NetStandard.Opc.Ua.Vision.OpenUsd@2.0.0-preview.4
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=OPCFoundation.NetStandard.Opc.Ua.Vision.OpenUsd&version=2.0.0-preview.4&prerelease
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=OPCFoundation.NetStandard.Opc.Ua.Vision.OpenUsd&version=2.0.0-preview.4&prerelease
                    


                            Install as a Cake Tool

OPCFoundation.NetStandard.Opc.Ua.Vision.OpenUsd

Offscreen renderer for the draft OPC UA Vision companion server.

This package renders a USD stage camera's view through the OpenUSD Silk backend (D3D12 hardware, D3D12 WARP software, or Vulkan headless) and returns encoded PNG frames through a small ISceneCameraCaptureProvider abstraction. The Vision server can depend on the abstraction without referencing OpenUSD, and degrades to a non-rendering sensor when this optional package is not present.

What it does

The Opc.Ua.Vision.OpenUsd.OpenUsdSceneCameraCaptureProvider fulfills a capture request by:

  1. Opening the USD stage from the supplied path or identifier.
  2. Resolving the camera prim (view + off-centre projection built from UsdGeomCamera.GetState(time) and GetTransform(time)) - or rendering the automatic default framing when no prim path is supplied.
  3. Creating a fresh OpenUsdSilkSession for the request (the SDK's reuse-with-different-camera path is known to silently render nothing).
  4. Capturing an RGBA8 frame with SilkFrameCapture.Capture on a shared ISilkGraphicsDevice picked at construction time.
  5. Encoding to PNG with an in-repo, dependency-free encoder.
  6. Refusing to hand back an all-zero / no-mesh frame as if it succeeded - returning SceneCameraCaptureStatus.BlankFrame with a reason instead.

Device selection

OpenUsdSceneCameraCaptureProvider tries backends in the order that makes sense for the host:

  • Windows: D3D12 hardware → D3D12 WARP (software rasterizer, no GPU) → Vulkan.
  • Linux / other: Vulkan (which the OpenUSD runtime bundles the SwiftShader software ICD for, so CI without a GPU is still functional).

The provider reports the chosen backend and whether it is a software renderer through Backend, and when no backend is available reports IsAvailable = false with a reason. In that case every CaptureAsync returns SceneCameraCaptureStatus.NoRenderingBackend.

Registration

using Opc.Ua.Vision.OpenUsd;
using Microsoft.Extensions.DependencyInjection;

services.AddOpenUsdSceneCameraCaptureProvider(o =>
{
    o.PluginPath = "/path/to/plugin/usd"; // optional; auto-probes AppContext.BaseDirectory
    o.PreferSoftware = false;
});

or without DI:

using var provider = new OpenUsdSceneCameraCaptureProvider(
    new OpenUsdSceneCaptureOptions(), telemetry: null);
SceneCameraCaptureResult result = await provider.CaptureAsync(
    new SceneCameraCaptureRequest
    {
        StageIdentifier = "/path/to/scene.usda",
        PrimPath = "/World/Cam",
        Width = 640,
        Height = 360,
        TimeCode = 0.0,
        Format = SceneCameraImageFormat.Png,
    },
    cancellationToken);

Native payload

The OpenUSD runtime packages ship RID-specific native assets (win-x64, linux-x64, osx-arm64). Publish the consuming application with an explicit RuntimeIdentifier (e.g. dotnet publish -r linux-x64) so the plugin/usd/ tree and the backend native libraries land alongside the executable. The provider then auto-discovers them from AppContext.BaseDirectory.

When the payload is absent — the normal case on unadorned CI legs — the provider still starts, Backend.IsAvailable reports false and every capture returns SceneCameraCaptureStatus.NoRenderingBackend. This is the degrade path the Vision developer guide describes: the sensor stays visible in the address space, browses still work, and only the pixel bytes are absent, so a client can distinguish "no GPU" from a genuine rendering fault.

Package Adds
OPCFoundation.NetStandard.Opc.Ua.Vision.Server The Vision server that consumes ISceneCameraCaptureProvider
OPCFoundation.NetStandard.Opc.Ua.Vision.Client The client that reads the simulated sensor's LatestClip / GetClip

License

OPC Foundation MIT License 1.00 — http://opcfoundation.org/License/MIT/1.00/

Product Compatible and additional computed target framework versions.
.NET net8.0 is compatible.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed.  net9.0 is compatible.  net9.0-android was computed.  net9.0-browser was computed.  net9.0-ios was computed.  net9.0-maccatalyst was computed.  net9.0-macos was computed.  net9.0-tvos was computed.  net9.0-windows was computed.  net10.0 is compatible.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-windows was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

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GitHub repositories

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Version Downloads Last Updated
2.0.0-preview.4 0 9/2/2026

https://github.com/OPCFoundation/UA-.NETStandard/releases