Axiom.SceneManagers.PortalConnected.PCZFrustum.IsObjectVisible C# (CSharp) Метод

		public bool IsObjectVisible( AxisAlignedBox bound )
		{
			// Null boxes are always invisible
			if ( bound.IsNull )
				return false;

			// Infinite boxes are always visible
			if ( bound.IsInfinite )
				return true;

			// Get centre of the box
			Vector3 centre = bound.Center;
			// Get the half-size of the box
			Vector3 halfSize = bound.HalfSize;

			// Check originplane if told to
			if ( mUseOriginPlane )
			{
				PlaneSide side = mOriginPlane.GetSide( centre, halfSize );
				if ( side == PlaneSide.Negative )
				{
					return false;
				}
			}

			// For each extra active culling plane, see if the entire aabb is on the negative side
			// If so, object is not visible
			foreach ( PCPlane plane in mActiveCullingPlanes )
			{
				PlaneSide xside = plane.GetSide( centre, halfSize );
				if ( xside == PlaneSide.Negative )
				{
					return false;
				}
			}
			return true;
		}

		/** (recursive) check the given light against all portals in the zone
		* NOTE: This is the default implementation, which doesn't take advantage
		*       of any zone-specific optimizations for checking portal visibility
		*/
		public override void CheckLightAgainstPortals( PCZLight light, ulong frameCount, PCZFrustum portalFrustum, Portal ignorePortal )
		{
			foreach ( Portal p in mPortals )
			{
				//Portal * p = *it;
				if ( p != ignorePortal )
				{
					// calculate the direction vector from light to portal
					Vector3 lightToPortal = p.getDerivedCP() - light.GetDerivedPosition();
					if ( portalFrustum.IsObjectVisible( p ) )
					{
						// portal is facing the light, but some light types need to
						// check illumination radius too.
						PCZone targetZone = p.getTargetZone();
						switch ( light.Type )
						{
							case LightType.Point:
								// point lights - just check if within illumination range
								if ( lightToPortal.Length <= light.AttenuationRange )
								{
									// if portal is quad portal it must be pointing towards the light
									if ( ( p.Type == PORTAL_TYPE.PORTAL_TYPE_QUAD && lightToPortal.Dot( p.getDerivedDirection() ) < 0.0 ) ||
										( p.Type != PORTAL_TYPE.PORTAL_TYPE_QUAD ) )
									{
										if ( !light.AffectsZone( targetZone ) )
										{
											light.AddZoneToAffectedZonesList( targetZone );
											if ( targetZone.LastVisibleFrame == frameCount )
											{
												light.AffectsVisibleZone = true;
											}
											// set culling frustum from the portal
											portalFrustum.AddPortalCullingPlanes( p );
											// recurse into the target zone of the portal
											p.getTargetZone().CheckLightAgainstPortals( light,
																						frameCount,
																						portalFrustum,
																						p.getTargetPortal() );
											// remove the planes added by this portal
											portalFrustum.RemovePortalCullingPlanes( p );
										}
									}
								}
								break;
							case LightType.Directional:
								// directionals have infinite range, so just make sure
								// the direction is facing the portal
								if ( lightToPortal.Dot( light.DerivedDirection ) >= 0.0 )
								{
									// if portal is quad portal it must be pointing towards the light
									if ( ( p.Type == PORTAL_TYPE.PORTAL_TYPE_QUAD && lightToPortal.Dot( p.getDerivedDirection() ) < 0.0 ) ||
										( p.Type == PORTAL_TYPE.PORTAL_TYPE_QUAD ) )
									{
										if ( !light.AffectsZone( targetZone ) )
										{
											light.AddZoneToAffectedZonesList( targetZone );
											if ( targetZone.LastVisibleFrame == frameCount )
											{
												light.AffectsVisibleZone = true;
											}
											// set culling frustum from the portal
											portalFrustum.AddPortalCullingPlanes( p );
											// recurse into the target zone of the portal
											p.getTargetZone().CheckLightAgainstPortals( light,
																						frameCount,
																						portalFrustum,
																						p.getTargetPortal() );
											// remove the planes added by this portal
											portalFrustum.RemovePortalCullingPlanes( p );
										}
									}
								}
								break;
							case LightType.Spotlight:
								// spotlights - just check if within illumination range
								// Technically, we should check if the portal is within
								// the cone of illumination, but for now, we'll leave that
								// as a future optimisation.
								if ( lightToPortal.Length <= light.AttenuationRange )
								{
									// if portal is quad portal it must be pointing towards the light
									if ( ( p.Type == PORTAL_TYPE.PORTAL_TYPE_QUAD && lightToPortal.Dot( p.getDerivedDirection() ) < 0.0 ) ||
										( p.Type != PORTAL_TYPE.PORTAL_TYPE_QUAD ) )
									{
										if ( !light.AffectsZone( targetZone ) )
										{
											light.AddZoneToAffectedZonesList( targetZone );
											if ( targetZone.LastVisibleFrame == frameCount )
											{
												light.AffectsVisibleZone = true;
											}
											// set culling frustum from the portal
											portalFrustum.AddPortalCullingPlanes( p );
											// recurse into the target zone of the portal
											p.getTargetZone().CheckLightAgainstPortals( light,
																						frameCount,
																						portalFrustum,
																						p.getTargetPortal() );
											// remove the planes added by this portal
											portalFrustum.RemovePortalCullingPlanes( p );
										}
									}
								}
								break;
						}
					}
				}
			}
		}