Lightmap : black/dark spots from normal map
I'm encountering a problem with my lightmap computations. I get very pronounced dark spot in my lightmap in areas where my normal maps have kinda big holes (it's a matter of speaking, they are not that big). I didn't found any setting to tweak the result I get.
At first I thought it was my ambient occlusion settings (in the level properties) but disabling it doesn't change anything. Changing the lighting quality also don't have any effect (I tried all of them, from "Preview" to "Production"). I get those spots everywhere : on walls, floors, ceilings, and so on.
I believe it's because of the way that normal maps are used to compute the indirect lighting. In UE3 there was a setting called "IndirectNormalInfluenceBoost" that allowed to control that, I don't see it in UE4 unfortunately. So I don't really know what to do to fix that... :\
asked Dec 14 '14 at 12:59 AM in Rendering
Would you mind providing me with the material you are using? Perhaps this is what is causing your issue. Check within the Usage settings of your material and see if you are checking the right boxes for how the material is actually being used within your scene.
I just recalled there is a setting within your 'Project Settings' within the 'Rendering' section to toggle using 'Normal Maps for Static Lighting.' Try disabling this setting to see if this is the fix you are looking for.
Normal Maps Used for Static Lighting
answered Dec 16 '14 at 08:42 PM
Unreal Engine 4 has the ability to control the number of Indirect Light Bounces as well as the smoothness of the lighting. This seems to be related to the Indirect Lighting as you mentioned yourself. Try going into your light source and increasing the number of Indirect Light Bounces as well as the quality. After making these changes, rebuild your scene and see if this changes anything.
Here are some image references to help you locate the settings I am mentioning to change.
Directional Light Settings
World Lightmass Settings
If you have tried a number of these options and exhausted your efforts, and still cannot get your black spots to go away. Let me know and we can try some other options.
answered Dec 16 '14 at 03:51 PM
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