We've tested the Intel one with the necessary passes and it just doesn't work right. Still possible we're doing something wrong, but I'm not ruling out that these denoisers are, as we know, based on *specific training data sets*, and Terragen is not going to be in those data sets (they're all going to be straightforward path tracing-only implementations is my guess). So even though the Terragen output looks similar to us, it *may* not look like what the denoiser is expecting.
I'd love to test OptiX, just the commandline version, but as I mentioned I don't have high enough level of hardware. If someone does I can send them appropriate output passes for a test. Terragen does support all the render passes needed for these (in the Pro version at least).
- Oshyan