Where to find the UsdLux Reference modified HdEmbree

[James]

We were excited to hear and read the updates to UsdLux documentation and hdEmbree being used as a reference implementation for direct lighting behaviour.

However, when we built hdEmbree from OpenUSD 25.08 we noticed that it does not support UsdLux lights. Is there any build options/ environment variables we may be missing to enable this?
Universal Scene Description: UsdLux : USD Lighting Schema

The example hdEmbree delegate provides a reference implementation, as well as a series of unit tests and reference images for renderers to check their own implementation against.

Thanks!
James

[nvmkuruc (Matthew Kuruc)]

Hi @James. The initial PR for the reference implementation just got merged into dev.

• [hdEmbree] Initial UsdLux reference implementation (hdEmbree-UsdLux-PR06) by pmolodo · Pull Request #3186 · PixarAnimationStudios/OpenUSD

You can track the status of the feature integrations here.

• [hdEmbree] Add UsdLux support to hdEmbree, to make it a reference UsdLux implementation by pmolodo · Pull Request #3199 · PixarAnimationStudios/OpenUSD

[James]

Aha, great, happy to see I have not been imagining things! Will likely cherry pick some of those updates and give it a go!