Update effectLayer.ts

src/Layers/effectLayer.ts

@@ -675,7 +675,7 @@ export abstract class EffectLayer {
         }
 
         // Culling
-        let sideOrientation = renderingMesh.overrideMaterialSideOrientation || material.sideOrientation;
+        let sideOrientation = renderingMesh.overrideMaterialSideOrientation ?? material.sideOrientation;
         const mainDeterminant = renderingMesh._getWorldMatrixDeterminant();
         if (mainDeterminant < 0) {
             sideOrientation = (sideOrientation === Material.ClockWiseSideOrientation ? Material.CounterClockWiseSideOrientation : Material.ClockWiseSideOrientation);