Missing Items in Mirror Reflection

[foggo]

I’ve created a rendering of a restroom which has some missing walls in the mirror’s reflection. See first image.

I’m was really pleased with the rendering generally but as you can see, some of the concrete fin walls between the toilet cubicle doors are missing.

If I change the viewpoint to look more directly into the mirror, as in the second image, the problem gets worse and the walls disappear completely.

This is really odd as the cubicle doors are fine and they are further back in the reflection.

I’ve seen from previous posts that some materials go missing if the items are not shown directly in the rendering but this is different issue I think.

Is there any way to fix this?

[Micha]

I suppose so your only chance is a fake - replace the mirrors by glass and mirror your scene. So, you get the same look like of mirrors, but anything should be looking perfect.

[Thomas_Willberger]

We will improve the reflection quality in an upcoming release but still some objects could be missing due to a performance tradeoff. It depends on the object size vs polycount.

[Pieter_2]

Interesting, Does that mean we will get better reflections if we section-box the model to only one room VS having the entire model on?

[Thomas_Willberger]

Right. This is necessary to ensure almost constant performance across all project sizes. If we would always draw everything with the same fidelity, large projects would quickly become unusable.

[foggo]

With the above comments in mind, I saved out the room as a separate model (as it was already a group). recreated the view and re-rendered.

The issue of the missing walls has been resolved, and this lighter model is very fast.

In hindsight it makes perfect sense to isolate a portion of a large project model, which this is, to produce visuals in a single, confined space.

There’s still the slightly annoying issue of materials not showing on some faces in the reflection but nothing I can’t fix in Photoshop.

Thanks to all for the suggestions.