internal void UpdateSettings()

in unity/Assets/PostProcessingV2/Runtime/PostProcessManager.cs [281:354]
44 lines of code
14 McCabe index (conditional complexity)

        internal void UpdateSettings(PostProcessLayer postProcessLayer)
        {
            // Reset to base state
            ReplaceData(postProcessLayer);

            // If no trigger is set, only global volumes will have influence
            int mask = postProcessLayer.volumeLayer.value;
            var volumeTrigger = postProcessLayer.volumeTrigger;
            bool onlyGlobal = volumeTrigger == null;
            var triggerPos = onlyGlobal ? Vector3.zero : volumeTrigger.position;

            // Sort the cached volume list(s) for the given layer mask if needed and return it
            var volumes = GrabVolumes(mask);

            // Traverse all volumes
            foreach (var volume in volumes)
            {
                // Skip disabled volumes and volumes without any data or weight
                if (!volume.enabled || volume.profileRef == null || volume.weight <= 0f)
                    continue;

                var settings = volume.profileRef.settings;

                // Global volume always have influence
                if (volume.isGlobal)
                {
                    postProcessLayer.OverrideSettings(settings, Mathf.Clamp01(volume.weight));
                    continue;
                }

                if (onlyGlobal)
                    continue;

                // If volume isn't global and has no collider, skip it as it's useless
                var colliders = m_TempColliders;
                volume.GetComponents(colliders);
                if (colliders.Count == 0)
                    continue;

                // Find closest distance to volume, 0 means it's inside it
                float closestDistanceSqr = float.PositiveInfinity;

                foreach (var collider in colliders)
                {
                    if (!collider.enabled)
                        continue;

                    var closestPoint = collider.ClosestPoint(triggerPos); // 5.6-only API
                    var d = ((closestPoint - triggerPos) / 2f).sqrMagnitude;

                    if (d < closestDistanceSqr)
                        closestDistanceSqr = d;
                }

                colliders.Clear();
                float blendDistSqr = volume.blendDistance * volume.blendDistance;

                // Volume has no influence, ignore it
                // Note: Volume doesn't do anything when `closestDistanceSqr = blendDistSqr` but
                //       we can't use a >= comparison as blendDistSqr could be set to 0 in which
                //       case volume would have total influence
                if (closestDistanceSqr > blendDistSqr)
                    continue;

                // Volume has influence
                float interpFactor = 1f;

                if (blendDistSqr > 0f)
                    interpFactor = 1f - (closestDistanceSqr / blendDistSqr);

                // No need to clamp01 the interpolation factor as it'll always be in [0;1[ range
                postProcessLayer.OverrideSettings(settings, interpFactor * Mathf.Clamp01(volume.weight));
            }
        }