prixat, I found where Ray Depth is noted, on the LightPath node. The blending value on 2 bath glass mats has that node attached to their Is Shadow Ray parameter.

hborre, I tried what you suggested but couldn't find the emission, until I used another camera to poke around outside. Two big fat area lights are slammed right up against the windows (on the wall and on the skylight).

So I turned off those area lights, left the 3rd infinite light on, made sure the EZInner and EZOuter were visible, gave it another try (Low Adaptive GPU for speed)—and we now have the hdr reflected. Whew! Glad that's over.

---

W11,Intel i9-14900KF @ 3.20GHz, 64.0 GB RAM, 64-bit, GeForce GTX 4070 Ti SUPER, 16GB. 

Old lady hobbyist.

All visual art or fiction is "playing with dolls."