UE4 Unreal Raytrace Shadow in Reflections
Hi,
This post was raised as my friend was facing problem regarding reflection and its shadows,
Problems :
Reflective Objects were seen black in reflection.
Shadows from Skylight was not casting in reflection.
So We followed the following steps:
a. Enabled Ray Tracing by File->Edit->ProjectSettings
Just search for Ray Tracing and enable it and do the restart for the engine.
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b. In the scene there was only skylight with this HDRI. So the reflections were good but the reflective object self was casting black reflection.
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So we added PostProcessVolume and enabled the unbound for it so hat it would affect the whole scene rather the boundings.
We increased the Max. Bounces to 4 so that the reflective object can be seen with multiple bounce and no black spot should come.
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c. So we got this , but we here saw that the shadows aren't seen coming from Skylight, so we enabled the Cast Raytrace Shadow for the same in Skylight.
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d. But In Reflection there isn't shadows yet and we got the console command for the same as
r.RayTracing.Reflections.RayTraceSkyLightContribution=1
After this the reflection got shadows as expected but yes the reflection shadows are much much expensive than reflection itself.
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Hope this would be helpful and informative but using shadows in reflection is much expensive.
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