SingleLayerWater receives specular highlights from occluded local light sources

Development Rendering
, ,
1

Local light sources that should be occluded by shadow casters are still creating specular highlights on SingleLayerWater materials.

2

Steps to Reproduce
In the sample level provided a lightsource is placed behind a wall shining towards the SingleLayerWater material. Notice the specular highlight of the light source on the SingleLayerWater material even though it should be occluded by the wall

3

Hello,

Thank you for reaching out.

I’ve been assigned this issue, and we will be looking into these specular highlights for you.

4

Hello,

It looks like the test project you have attached does not have the Water plugin enabled, and does not show the issue.

Can you please attach a test project that shows the issue, and does not contain other content? Please also include a screenshot of the issue.

The guide for test projects:

[Content removed]

5

Thanks - I wanted to follow the guide, but the link on [Content removed] is broken [Content removed]

I’ve created a new blank project from scratch that shows the issue. I have not enabled the water plugin as it’s not required to repro the issue.

I can only attach a single item - so the screenshot is in the zip file as Saved/AutoScreenshot.png

6

Hello,

SingleLayerWater uses forward shading and disables forward local lights, so shadows cast by local lights is not expected to apply.

For more information, please see how “EnvironmentDefines->bDisableForwardLocalLights” is assigned in “FHLSLMaterialTranslator::PrepareEnvironmentDefines()” from HLSLMaterialTranslator.cpp.

You can also look at the function “GetForwardDirectLightingSplit(…)” from ForwardLightingCommon.ush.

Please let us know if this helps.