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RectLight can not affect billboard

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Hi，

I found a very serious problem when I was working on the project these days, the rectangular light source cannot affect the billboard. At the beginning, I thought there must be something wrong with my settings, but in the later attempts, I found that the rectangular light source did not affect it. The following is a screenshot of what I tried. Only the rectangular light source cannot affect the billboard, but the point light source or other light source types can be affected.

I set up a point light and a rectangle light for comparison. This is the case when the point light is off and the rectangle light is on. As you can see, the billboard is not illuminated.

I set up a point light and a rectangle light for comparison. This is the case when the point light is on and the rectangle light is off. As you can see, the billboard is lit correctly.

Is there a setting that needs to be turned on so that the light source can affect the billboard.

THANK YOU

TwoDoge8910

TwentyStudios

Why would you use virtual lights to light the talent? Due to the flat nature of the video texture it wi never look realistic anyway. Much better to turn off Lit on the billboard and match the lighting with physical lights instead.

TwoDoge8910

Hi，

I want the virtual lights to affect the billboard, maybe the light effects are not quite right, but at least the billboard looks right. And our studio doesn't have the conditions to simulate natural lighting, so I just wonder why the rectlight can't affect the billboard. Or is there a way to make the rectlight affect the billboard cause there have some rectlights in my unreal project.

Thank you

TwentyStudios

What I’m trying to say is that lighting the Billboard with virtual lights won’t look natural or good. It’s just a flat plane so it won’t react to light the way an object in the environment would.

Eifert@Aximmetry

Hi,

This is partially due to the limitation of Unreal Engine. Rect Lights in Unreal doesn't support translucent materials. And Aximmetry's billboards use translucent materials.

I don't think there is a simple workaround for this. You might want to use a different light source instead of Rect Lights. In the end, as TwentyStudios says, billboards can not use virtual lights in the best way as they are flat surfaces.
What you see actually with other Unreal lights is that they affect the whole billboard in a gradual way. And there are no hard divides between lit and unlit areas on the billboard, which would look very unnatural on the flat surface of the billboard.

Warmest regards,

RectLight can not affect billboard

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