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# Material Preview
## Overview
Material preview is a UI feature which displays a lit spherical preview of a PBR material. It can be found in the following UIs:
- The material picker swatch
- In the build floater, in the Texture tab, when applying a PBR material
- (If the feature is enabled) In the Region/Estate floater, in the Terrain tab, when applying PBR materials to terrain
- In the floater to select a material from inventory, which can be opened by clicking the material picker swatch
## Known Issues
These are known issues that the current implementation of this feature does not address:
- Material swatch preview is a preview of the base material ID only, and ignores other properties on the prim face like material overrides
- Alpha mask previews as alpha blend
- Double-sided previews as single-sided
- Material swatch preview inherits some of its lighting from the current environment, and reflections from the default reflection probe
## General Regression Testing
- Check that the material preview swatch looks OK with different materials selected
- Check that the material preview swatch runs reasonably well on different systems, especially when the select material from inventory floater is also open
- In particular: AMD, MacOS, minimum spec machines
- Watch out for regressions in rendering caused by opening a floater with a material preview swatch
## Bug Fixes
### Disappearing Objects Fix Test
This test is recommended for verifying that secondlife/viewer-issues#72 is fixed.
#### Symptoms
The following types of objects could randomly disappear until relog in the main view when the bug occured:
- Objects
- Water level in current region
- Adjacent region/void water
Note: Disappearing objects in reflections have a different root cause and are not covered by the fix.
#### Bug Reproduction Steps
Verify the disappearing objects bug does not reproduce, given the following steps:
- Runtime prerequisites: Material preview swatch is enabled ("UIPreviewMaterial") by visiting a test region with the feature enabled, or by manually enabling "UIPreviewMaterial" in the advanced settings for the current session
- Region prerequisites: Unknown, but a region with lots of stuff in it (like Rumpus Room 2048 on Aditi) seems to increase repro rate
- Right click an object and select, "Edit item"
- Go to texture tab, select PBR Metallic Roughness from dropdown, and click the button to select material from inventory
- Ensure "Apply now" is checked in the inventory selection floater
- Alternate between different materials from the inventory selection floater
- Look around the world and check for permanently disappeared objects.
### Dynamic Exposure Influence Fix Test
This test is recommended for verifying that secondlife/viewer-issues#72 is fixed.
#### Symptoms
Dynamic exposure in the world could be influenced by the material preview being displayed. If a material preview was being generated in a given frame, then, depending on the current environment, the user would observe an unpleasant flashing effect in the environment:
- The world view could suddenly get darker and then fade back to normal exposure levels
- The world view could suddenly get brighter and then fade back to normal exposure levels
#### Bug Reproduction Steps
Verify the dynamic exposure influence bug does not reproduce. Test using a few environment presets such as Default Midday, Sunset, and Midnight.
- Right click an object and select, "Edit item"
- Go to texture tab, select PBR Metallic Roughness from dropdown, and click the button to select material from inventory
- Alternate between different materials from the inventory selection floater
#### Regression Testing
Dynamic exposure in the world should continue to work correctly. In particular:
- Exposure should fade gradually from high exposure to low exposure and back as needed
- Exposure should decrease in brighter environments
- Exposure should increase in darker environments
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