Light passing through parts

[rogeriodec_games]

Reproduction Steps
Run this project:
light.rbxl (32.4 KB)

I have a surface light (1) that is passing through a part (2) and hit the ceiling (3), even it’s pointing to the bottom (floor):

Expected Behavior
The light should not pass through the intermediate part.

Actual Behavior
The light is passing through the intermediate part.

Issue Area: Engine
Issue Type: Display
Impact: High
Frequency: Constantly

[EmilyBendsSpace]

You’re going to have this issue with any of the light types as long as you’re using one of the voxel-based Lighting settings. It takes a part something like 8 studs thick to completely block any light source in any of the voxel modes (Compatibility, Voxel, Shadowmap). Setting Lighting.Technology to Future will have the behavior you expect.

[rogeriodec_games]

@EmilyBendsSpace

Lighting.Technology

Thanks.
Can you tell me if “future” technology has any significantly negative impact on game performance compared to the current “shadow map”?

[nakata1609]

I have an issue with light and sunlight passing through meshpart with doublesided off

[UnpalatabIe]

@rogeriodec_games

Can you tell me if “future” technology has any significantly negative impact on game performance compared to the current “shadow map”?

It does, and the impact increases with the amount of lights. I can’t say exact numbers, but on a blank baseplate with 9 PointLights my FPS dropped from 588 to 488 (I used FPS unlocker).