adopt AO calculation tweak from Indigo

gradle.properties

@@ -4,7 +4,7 @@ org.gradle.daemon=false
 group = com.github.octarine-noise
 jarName = BetterFoliage-Forge
 
-version = 2.6.1
+version = 2.6.3
 
 mcVersion = 1.15.2
 forgeVersion = 31.2.44

src/main/kotlin/mods/betterfoliage/render/lighting/VanillaAoCalculation.kt

@@ -23,6 +23,10 @@ data class LightingData(
     }
 }
 
+// Vanilla has a very suspicious-looking offset here, which Indigo gets rid of and calls it a fix
+// Naturally, we're going to believe Indigo, it's a hardcoded option for now
+const val OCCLUSION_OFFSET_FIX = true
+
 /**
  * Replacement for [BlockModelRenderer.AmbientOcclusionFace]
  * This gets called on a LOT, so object instantiation is avoided.
@@ -87,9 +91,9 @@ class VanillaAoCalculator {
         sideHelper.sides.forEachIndexed { sideIdx, sideDir ->
             // record light data in the block 1 step to the side
             probe.position { setPos(lightOrigin).move(sideDir) }.writeTo(sideAo[sideIdx])
-            // side is considered occluded if the block 1 step to that side and
-            // 1 step forward (in the lightface direction) is not fully transparent
-            isOccluded[sideIdx] = probe.position { move(lightFace) }.isNonTransparent
+            // side is considered occluded if the block 1 step to that side is not fully transparent
+            if (!OCCLUSION_OFFSET_FIX) probe.position { move(lightFace) }
+            isOccluded[sideIdx] = probe.isNonTransparent
         }
 
         // AO Calculation for the 4 corners