Blotchy, dappled, dark patches on lightmaps

I've done quite a lot of lightmapping with Unity in the past, but this has me stumped. Whatever I try doesn't seem to help.

My issue is with dark patches on models when lightmapping, and obvious edges appearing. Hopefully these images will explain:






Comparison with no lightmaps, which is fine:



The object is an airplane in a large hangar, lit by multiple spotlights on the ceiling (Shadow Samples 3, Shadow Radius 1), and a Directional Light that passes through a skylight above.

All lights are set to BakedOnly. All objects in the scene are static.

Note: I didn't make the object myself, could it be a problem with the FBX?

I'm using Skyshop and LM Extended. My beast XML settings are below. I'm using Directional lightmaps.

Code (CSharp):

1. <?xml version="1.0" encoding="iso-8859-1"?>
2. <ILConfig>
3.   <AASettings>
4.     <minSampleRate>0</minSampleRate>
5.     <maxSampleRate>2</maxSampleRate>
6.     <contrast>0.1</contrast>
7.     <diagnose>false</diagnose>
8.     <clamp>false</clamp>
9.     <samplingMode>Adaptive</samplingMode>
10.     <filter>Box</filter>
11.     <filterSize>
12.       <x>1</x>
13.       <y>1</y>
14.     </filterSize>
15.   </AASettings>
16.   <RenderSettings>
17.     <bias>0.005</bias>
18.     <giTransparencyDepth>2</giTransparencyDepth>
19.     <ignoreLightLinks>false</ignoreLightLinks>
20.     <maxRayDepth>6</maxRayDepth>
21.     <maxShadowRays>4</maxShadowRays>
22.     <minShadowRays>0</minShadowRays>
23.     <reflectionDepth>2</reflectionDepth>
24.     <reflectionThreshold>0.001</reflectionThreshold>
25.     <shadowDepth>2</shadowDepth>
26.     <shadowsIgnoreLightLinks>false</shadowsIgnoreLightLinks>
27.     <transparencyDepth>50</transparencyDepth>
28.     <tsIntersectionNormalization>true</tsIntersectionNormalization>
29.     <tsIntersectionOrthogonalization>true</tsIntersectionOrthogonalization>
30.     <tsOddUVFlipping>true</tsOddUVFlipping>
31.     <tsVertexNormalization>true</tsVertexNormalization>
32.     <tsVertexOrthogonalization>true</tsVertexOrthogonalization>
33.     <vertexMergeThreshold>0.001</vertexMergeThreshold>
34.   </RenderSettings>
35.   <EnvironmentSettings>
36.     <giEnvironment>None</giEnvironment>
37.     <skyLightColor>
38.       <r>0.86</r>
39.       <g>0.93</g>
40.       <b>1</b>
41.       <a>1</a>
42.     </skyLightColor>
43.     <giEnvironmentIntensity>1</giEnvironmentIntensity>
44.     <iblImageFile />
45.     <iblBandingVsNoise>1</iblBandingVsNoise>
46.     <iblEmitDiffuse>true</iblEmitDiffuse>
47.     <iblEmitLight>false</iblEmitLight>
48.     <iblEmitSpecular>false</iblEmitSpecular>
49.     <iblGIEnvBlur>0</iblGIEnvBlur>
50.     <iblIntensity>1</iblIntensity>
51.     <iblSamples>300</iblSamples>
52.     <iblShadows>true</iblShadows>
53.     <iblSpecularBoost>1</iblSpecularBoost>
54.     <iblSwapYZ>false</iblSwapYZ>
55.     <iblTurnDome>90</iblTurnDome>
56.   </EnvironmentSettings>
57.   <FrameSettings>
58.     <autoThreads>true</autoThreads>
59.     <autoThreadsSubtract>0</autoThreadsSubtract>
60.     <renderThreads>2</renderThreads>
61.     <dither>true</dither>
62.     <inputGamma>1</inputGamma>
63.     <outputCorrection>
64.       <colorCorrection>None</colorCorrection>
65.       <gamma>1</gamma>
66.     </outputCorrection>
67.     <premultiply>true</premultiply>
68.     <premultiplyThreshold>0</premultiplyThreshold>
69.     <outputVerbosity>
70.       <errorPrint>true</errorPrint>
71.       <warningPrint>true</warningPrint>
72.       <benchmarkPrint>false</benchmarkPrint>
73.       <progressPrint>true</progressPrint>
74.       <infoPrint>false</infoPrint>
75.       <verbosePrint>false</verbosePrint>
76.       <debugPrint>false</debugPrint>
77.       <debugFile>false</debugFile>
78.     </outputVerbosity>
79.   </FrameSettings>
80.   <GISettings>
81.     <clampMaterials>None</clampMaterials>
82.     <diffuseBoost>1</diffuseBoost>
83.     <emissiveScale>1</emissiveScale>
84.     <enableCaustics>false</enableCaustics>
85.     <enableGI>true</enableGI>
86.     <ignoreNonDiffuse>true</ignoreNonDiffuse>
87.     <prepassMaxSampleRate>0</prepassMaxSampleRate>
88.     <prepassMinSampleRate>-4</prepassMinSampleRate>
89.     <primaryIntegrator>FinalGather</primaryIntegrator>
90.     <primaryIntensity>1</primaryIntensity>
91.     <primarySaturation>1</primarySaturation>
92.     <secondaryIntegrator>None</secondaryIntegrator>
93.     <secondaryIntensity>1</secondaryIntensity>
94.     <secondarySaturation>1</secondarySaturation>
95.     <specularScale>1</specularScale>
96.     <fgAOContrast>0.666</fgAOContrast>
97.     <fgAOInfluence>0.181</fgAOInfluence>
98.     <fgAOMaxDistance>0.3</fgAOMaxDistance>
99.     <fgAOScale>2</fgAOScale>
100.     <fgAOVisualize>false</fgAOVisualize>
101.     <fgAttenuationStart>0</fgAttenuationStart>
102.     <fgAttenuationStop>0</fgAttenuationStop>
103.     <fgCacheDirectLight>false</fgCacheDirectLight>
104.     <fgCheckVisibility>true</fgCheckVisibility>
105.     <fgCheckVisibilityDepth>1</fgCheckVisibilityDepth>
106.     <fgClampRadiance>false</fgClampRadiance>
107.     <fgContrastThreshold>0.1</fgContrastThreshold>
108.     <fgDepth>1</fgDepth>
109.     <fgEstimatePoints>15</fgEstimatePoints>
110.     <fgExploitFrameCoherence>false</fgExploitFrameCoherence>
111.     <fgFalloffExponent>0</fgFalloffExponent>
112.     <fgGradientThreshold>0.5</fgGradientThreshold>
113.     <fgInterpolationPoints>15</fgInterpolationPoints>
114.     <fgLightLeakRadius>0</fgLightLeakRadius>
115.     <fgLightLeakReduction>false</fgLightLeakReduction>
116.     <fgMaxRayLength>0</fgMaxRayLength>
117.     <fgNormalThreshold>0.2</fgNormalThreshold>
118.     <fgPreview>false</fgPreview>
119.     <fgRays>500</fgRays>
120.     <fgUseCache>Irradiance</fgUseCache>
121.     <ptAccuracy>1</ptAccuracy>
122.     <ptCacheDirectLight>false</ptCacheDirectLight>
123.     <ptCheckVisibility>true</ptCheckVisibility>
124.     <ptConservativeEnergyLimit>0.95</ptConservativeEnergyLimit>
125.     <ptDefaultColor>
126.       <r>0</r>
127.       <g>0</g>
128.       <b>0</b>
129.       <a>1</a>
130.     </ptDefaultColor>
131.     <ptDepth>5</ptDepth>
132.     <ptDiffuseIllum>true</ptDiffuseIllum>
133.     <ptFile />
134.     <ptFilterSize>3</ptFilterSize>
135.     <ptFilterType>Gauss</ptFilterType>
136.     <ptNormalThreshold>0.7</ptNormalThreshold>
137.     <ptPointSize>0</ptPointSize>
138.     <ptPrecalcIrradiance>true</ptPrecalcIrradiance>
139.     <ptPreview>false</ptPreview>
140.     <ptSpecularIllum>true</ptSpecularIllum>
141.     <ptTransmissiveIllum>true</ptTransmissiveIllum>
142.     <mcDepth>2</mcDepth>
143.     <mcMaxRayLength>0</mcMaxRayLength>
144.     <mcRays>16</mcRays>
145.   </GISettings>
146.   <SurfaceTransferSettings>
147.     <frontRange>0</frontRange>
148.     <frontBias>0</frontBias>
149.     <backRange>2</backRange>
150.     <backBias>-1</backBias>
151.     <selectionMode>Normal</selectionMode>
152.   </SurfaceTransferSettings>
153.   <TextureBakeSettings>
154.     <bgColor>
155.       <r>1</r>
156.       <g>1</g>
157.       <b>1</b>
158.       <a>1</a>
159.     </bgColor>
160.     <bilinearFilter>true</bilinearFilter>
161.     <conservativeRasterization>true</conservativeRasterization>
162.     <edgeDilation>3</edgeDilation>
163.   </TextureBakeSettings>
164. </ILConfig>

 

It was higher res, I'm just lowering it briefly while I test a lower quality bake

 

Ha! Yes, Not sure why I didn't notice that. Well, that would explain the line that runs across it - I guess? I'll ask the artist about that, see if he has any ideas..

The blotchyness though - that remains an issue.

Lightmaps are uncompressed, and set to a max res of 2048.

 

Not sure if this is the problem (There seem to be a few reasons from the search I did a while back), however I found when baking if I had lights that were really close to objects (Or almost intersecting), it could create the same blotchy pattern. It could also just be caused by only using a small number of rays. I'm pretty sure there's a setting in there somewhere for rays, can't remember where though .