// check if portal is close to another portal.
// Note, both portals are assumed to be stationary
// and DerivedCP is the current position.
// this function is INTENTIONALLY NOT EXACT because
// it is used by PCZSM::connectPortalsToTargetZonesByLocation
// which is a utility function to link up nearby portals
//
public bool closeTo(Portal otherPortal)
{
// only portals of the same type can be "close to" each other.
if (this.mType != otherPortal.Type)
{
return(false);
}
bool close = false;
switch (this.mType)
{
default:
case PORTAL_TYPE.PORTAL_TYPE_QUAD:
{
// quad portals must be within 1/4 sphere of each other
Sphere quarterSphere1 = this.mDerivedSphere;
quarterSphere1.Radius = quarterSphere1.Radius * 0.25f;
Sphere quarterSphere2 = otherPortal.getDerivedSphere();
quarterSphere2.Radius = quarterSphere2.Radius * 0.25f;
close = quarterSphere1.Intersects(quarterSphere2);
}
break;
case PORTAL_TYPE.PORTAL_TYPE_AABB:
// NOTE: AABB's must match perfectly
if (this.mDerivedCP == otherPortal.getDerivedCP() && this.mCorners[0] == otherPortal.getCorner(0) &&
this.mCorners[1] == otherPortal.getCorner(1))
{
close = true;
}
break;
case PORTAL_TYPE.PORTAL_TYPE_SPHERE:
// NOTE: Spheres must match perfectly
if (this.mDerivedCP == otherPortal.getDerivedCP() && this.mRadius == otherPortal.getRadius())
{
close = true;
}
break;
}
return(close);
}
/// <summary>
/// IsObjectVisible() function for portals.
/// </summary>
/// <remarks>
/// Everything needs to be updated spatially before this function is
/// called including portal corners, frustum planes, etc.
/// </remarks>
/// <param name="portal">
/// The <see cref="Portal"/> to check visibility against.
/// </param>
/// <param name="culledBy">
/// The <see cref="FrustumPlane"/> that the Portal is in.
/// </param>
/// <returns>
/// true if the Portal is visible.
/// </returns>
public bool IsObjectVisible( Portal portal, out FrustumPlane culledBy )
{
culledBy = FrustumPlane.None;
// if portal isn't open, it's not visible
if ( !portal.IsOpen )
{
return false;
}
// check the extra frustum first
if ( !this.extraCullingFrustum.IsObjectVisible( portal ) )
{
return false;
}
// if portal is of type AABB or Sphere, then use simple bound check against planes
if ( portal.Type == PORTAL_TYPE.PORTAL_TYPE_AABB )
{
var aabb = new AxisAlignedBox( portal.getDerivedCorner( 0 ), portal.getDerivedCorner( 1 ) );
return base.IsObjectVisible( aabb, out culledBy );
}
else if ( portal.Type == PORTAL_TYPE.PORTAL_TYPE_SPHERE )
{
return base.IsObjectVisible( portal.getDerivedSphere(), out culledBy );
}
// check if the portal norm is facing the camera
Vector3 cameraToPortal = portal.getDerivedCP() - DerivedPosition;
Vector3 portalDirection = portal.getDerivedDirection();
Real dotProduct = cameraToPortal.Dot( portalDirection );
if ( dotProduct > 0 )
{
// portal is faced away from camera
return false;
}
// check against regular frustum planes
bool visible_flag;
if ( null != CullFrustum )
{
// For each frustum plane, see if all points are on the negative side
// If so, object is not visible
// NOTE: We skip the NEAR plane (plane #0) because Portals need to
// be visible no matter how close you get to them.
for ( int plane = 1; plane < 6; ++plane )
{
// set the visible flag to false
visible_flag = false;
// Skip far plane if infinite view frustum
if ( (FrustumPlane)plane == FrustumPlane.Far && _farDistance == 0 )
{
continue;
}
// we have to check each corner of the portal
for ( int corner = 0; corner < 4; corner++ )
{
PlaneSide side = CullFrustum.FrustumPlanes[ plane ].GetSide( portal.getDerivedCorner( corner ) );
if ( side != PlaneSide.Negative )
{
visible_flag = true;
}
}
// if the visible_flag is still false, then this plane
// culled all the portal points
if ( visible_flag == false )
{
// ALL corners on negative side therefore out of view
if ( culledBy != FrustumPlane.None )
{
culledBy = (FrustumPlane)plane;
}
return false;
}
}
}
else
{
// Make any pending updates to the calculated frustum planes
UpdateFrustumPlanes();
// For each frustum plane, see if all points are on the negative side
// If so, object is not visible
// NOTE: We skip the NEAR plane (plane #0) because Portals need to
// be visible no matter how close you get to them.
// BUGBUG: This can cause a false positive situation when a portal is
// behind the camera but close. This could be fixed by having another
// culling plane at the camera location with normal same as camera direction.
for ( int plane = 1; plane < 6; ++plane )
{
// set the visible flag to false
visible_flag = false;
// Skip far plane if infinite view frustum
if ( (FrustumPlane)plane == FrustumPlane.Far && _farDistance == 0 )
{
continue;
}
// we have to check each corner of the portal
for ( int corner = 0; corner < 4; corner++ )
{
PlaneSide side = _planes[ plane ].GetSide( portal.getDerivedCorner( corner ) );
if ( side != PlaneSide.Negative )
{
visible_flag = true;
}
}
// if the visible_flag is still false, then this plane
// culled all the portal points
if ( visible_flag == false )
{
// ALL corners on negative side therefore out of view
if ( culledBy != FrustumPlane.None )
{
culledBy = (FrustumPlane)plane;
}
return false;
}
}
}
// no plane culled all the portal points and the norm
// was facing the camera, so this portal is visible
return true;
}
/// <summary>
/// IsObjectVisible() function for portals.
/// </summary>
/// <remarks>
/// Everything needs to be updated spatially before this function is
/// called including portal corners, frustum planes, etc.
/// </remarks>
/// <param name="portal">
/// The <see cref="Portal"/> to check visibility against.
/// </param>
/// <returns>
/// true if the Portal is visible.
/// </returns>
public bool IsObjectVisible( Portal portal )
{
// if portal isn't open, it's not visible
if ( !portal.IsOpen )
{
return false;
}
// if the frustum has no planes, just return true
if ( mActiveCullingPlanes.Count == 0 )
{
return true;
}
// check if this portal is already in the list of active culling planes (avoid
// infinite recursion case)
foreach ( PCPlane plane in mActiveCullingPlanes )
{
if ( plane.Portal == portal )
{
return false;
}
}
// if portal is of type AABB or Sphere, then use simple bound check against planes
if ( portal.Type == PORTAL_TYPE.PORTAL_TYPE_AABB )
{
AxisAlignedBox aabb = new AxisAlignedBox();
aabb.SetExtents( portal.getDerivedCorner( 0 ), portal.getDerivedCorner( 1 ) );
return IsObjectVisible( aabb );
}
else if ( portal.Type == PORTAL_TYPE.PORTAL_TYPE_SPHERE )
{
return IsObjectVisible( portal.getDerivedSphere() );
}
// check if the portal norm is facing the frustum
Vector3 frustumToPortal = portal.getDerivedCP() - mOrigin;
Vector3 portalDirection = portal.getDerivedDirection();
Real dotProduct = frustumToPortal.Dot( portalDirection );
if ( dotProduct > 0 )
{
// portal is faced away from Frustum
return false;
}
// check against frustum culling planes
bool visible_flag;
// Check originPlane if told to
if ( mUseOriginPlane )
{
// set the visible flag to false
visible_flag = false;
// we have to check each corner of the portal
for ( int corner = 0; corner < 4; corner++ )
{
PlaneSide side = mOriginPlane.GetSide( portal.getDerivedCorner( corner ) );
if ( side != PlaneSide.Negative )
{
visible_flag = true;
}
}
// if the visible_flag is still false, then the origin plane
// culled all the portal points
if ( visible_flag == false )
{
// ALL corners on negative side therefore out of view
return false;
}
}
// For each active culling plane, see if all portal points are on the negative
// side. If so, the portal is not visible
foreach ( PCPlane plane in mActiveCullingPlanes )
{
visible_flag = false;
// we have to check each corner of the portal
for ( int corner = 0; corner < 4; corner++ )
{
PlaneSide side = plane.GetSide( portal.getDerivedCorner( corner ) );
if ( side != PlaneSide.Negative )
{
visible_flag = true;
}
}
// if the visible_flag is still false, then this plane
// culled all the portal points
if ( visible_flag == false )
{
// ALL corners on negative side therefore out of view
return false;
}
}
// no plane culled all the portal points and the norm
// was facing the frustum, so this portal is visible
return true;
}
/// <summary>
/// IsObjectVisible() function for portals.
/// </summary>
/// <remarks>
/// Everything needs to be updated spatially before this function is
/// called including portal corners, frustum planes, etc.
/// </remarks>
/// <param name="portal">
/// The <see cref="Portal"/> to check visibility against.
/// </param>
/// <returns>
/// true if the Portal is visible.
/// </returns>
public bool IsObjectVisible(Portal portal)
{
// if portal isn't open, it's not visible
if (!portal.IsOpen)
{
return(false);
}
// if the frustum has no planes, just return true
if (this.mActiveCullingPlanes.Count == 0)
{
return(true);
}
// check if this portal is already in the list of active culling planes (avoid
// infinite recursion case)
foreach (PCPlane plane in this.mActiveCullingPlanes)
{
if (plane.Portal == portal)
{
return(false);
}
}
// if portal is of type AABB or Sphere, then use simple bound check against planes
if (portal.Type == PORTAL_TYPE.PORTAL_TYPE_AABB)
{
var aabb = new AxisAlignedBox();
aabb.SetExtents(portal.getDerivedCorner(0), portal.getDerivedCorner(1));
return(IsObjectVisible(aabb));
}
else if (portal.Type == PORTAL_TYPE.PORTAL_TYPE_SPHERE)
{
return(IsObjectVisible(portal.getDerivedSphere()));
}
// check if the portal norm is facing the frustum
Vector3 frustumToPortal = portal.getDerivedCP() - this.mOrigin;
Vector3 portalDirection = portal.getDerivedDirection();
Real dotProduct = frustumToPortal.Dot(portalDirection);
if (dotProduct > 0)
{
// portal is faced away from Frustum
return(false);
}
// check against frustum culling planes
bool visible_flag;
// Check originPlane if told to
if (this.mUseOriginPlane)
{
// set the visible flag to false
visible_flag = false;
// we have to check each corner of the portal
for (int corner = 0; corner < 4; corner++)
{
PlaneSide side = this.mOriginPlane.GetSide(portal.getDerivedCorner(corner));
if (side != PlaneSide.Negative)
{
visible_flag = true;
}
}
// if the visible_flag is still false, then the origin plane
// culled all the portal points
if (visible_flag == false)
{
// ALL corners on negative side therefore out of view
return(false);
}
}
// For each active culling plane, see if all portal points are on the negative
// side. If so, the portal is not visible
foreach (PCPlane plane in this.mActiveCullingPlanes)
{
visible_flag = false;
// we have to check each corner of the portal
for (int corner = 0; corner < 4; corner++)
{
PlaneSide side = plane.GetSide(portal.getDerivedCorner(corner));
if (side != PlaneSide.Negative)
{
visible_flag = true;
}
}
// if the visible_flag is still false, then this plane
// culled all the portal points
if (visible_flag == false)
{
// ALL corners on negative side therefore out of view
return(false);
}
}
// no plane culled all the portal points and the norm
// was facing the frustum, so this portal is visible
return(true);
}
// check if portal is close to another portal.
// Note, both portals are assumed to be stationary
// and DerivedCP is the current position.
// this function is INTENTIONALLY NOT EXACT because
// it is used by PCZSM::connectPortalsToTargetZonesByLocation
// which is a utility function to link up nearby portals
//
public bool closeTo( Portal otherPortal )
{
// only portals of the same type can be "close to" each other.
if ( mType != otherPortal.Type )
{
return false;
}
bool close = false;
switch ( mType )
{
default:
case PORTAL_TYPE.PORTAL_TYPE_QUAD:
{
// quad portals must be within 1/4 sphere of each other
Sphere quarterSphere1 = mDerivedSphere;
quarterSphere1.Radius = quarterSphere1.Radius * 0.25f;
Sphere quarterSphere2 = otherPortal.getDerivedSphere();
quarterSphere2.Radius = quarterSphere2.Radius * 0.25f;
close = quarterSphere1.Intersects( quarterSphere2 );
}
break;
case PORTAL_TYPE.PORTAL_TYPE_AABB:
// NOTE: AABB's must match perfectly
if ( mDerivedCP == otherPortal.getDerivedCP() &&
mCorners[ 0 ] == otherPortal.getCorner( 0 ) &&
mCorners[ 1 ] == otherPortal.getCorner( 1 ) )
{
close = true;
}
break;
case PORTAL_TYPE.PORTAL_TYPE_SPHERE:
// NOTE: Spheres must match perfectly
if ( mDerivedCP == otherPortal.getDerivedCP() &&
mRadius == otherPortal.getRadius() )
{
close = true;
}
break;
}
return close;
}
/// <summary>
/// IsObjectVisible() function for portals.
/// </summary>
/// <remarks>
/// Everything needs to be updated spatially before this function is
/// called including portal corners, frustum planes, etc.
/// </remarks>
/// <param name="portal">
/// The <see cref="Portal"/> to check visibility against.
/// </param>
/// <param name="culledBy">
/// The <see cref="FrustumPlane"/> that the Portal is in.
/// </param>
/// <returns>
/// true if the Portal is visible.
/// </returns>
public bool IsObjectVisible(Portal portal, out FrustumPlane culledBy)
{
culledBy = FrustumPlane.None;
// if portal isn't open, it's not visible
if (!portal.IsOpen)
{
return(false);
}
// check the extra frustum first
if (!this.extraCullingFrustum.IsObjectVisible(portal))
{
return(false);
}
// if portal is of type AABB or Sphere, then use simple bound check against planes
if (portal.Type == PORTAL_TYPE.PORTAL_TYPE_AABB)
{
var aabb = new AxisAlignedBox(portal.getDerivedCorner(0), portal.getDerivedCorner(1));
return(base.IsObjectVisible(aabb, out culledBy));
}
else if (portal.Type == PORTAL_TYPE.PORTAL_TYPE_SPHERE)
{
return(base.IsObjectVisible(portal.getDerivedSphere(), out culledBy));
}
// check if the portal norm is facing the camera
Vector3 cameraToPortal = portal.getDerivedCP() - DerivedPosition;
Vector3 portalDirection = portal.getDerivedDirection();
Real dotProduct = cameraToPortal.Dot(portalDirection);
if (dotProduct > 0)
{
// portal is faced away from camera
return(false);
}
// check against regular frustum planes
bool visible_flag;
if (null != CullFrustum)
{
// For each frustum plane, see if all points are on the negative side
// If so, object is not visible
// NOTE: We skip the NEAR plane (plane #0) because Portals need to
// be visible no matter how close you get to them.
for (int plane = 1; plane < 6; ++plane)
{
// set the visible flag to false
visible_flag = false;
// Skip far plane if infinite view frustum
if ((FrustumPlane)plane == FrustumPlane.Far && _farDistance == 0)
{
continue;
}
// we have to check each corner of the portal
for (int corner = 0; corner < 4; corner++)
{
PlaneSide side = CullFrustum.FrustumPlanes[plane].GetSide(portal.getDerivedCorner(corner));
if (side != PlaneSide.Negative)
{
visible_flag = true;
}
}
// if the visible_flag is still false, then this plane
// culled all the portal points
if (visible_flag == false)
{
// ALL corners on negative side therefore out of view
if (culledBy != FrustumPlane.None)
{
culledBy = (FrustumPlane)plane;
}
return(false);
}
}
}
else
{
// Make any pending updates to the calculated frustum planes
UpdateFrustumPlanes();
// For each frustum plane, see if all points are on the negative side
// If so, object is not visible
// NOTE: We skip the NEAR plane (plane #0) because Portals need to
// be visible no matter how close you get to them.
// BUGBUG: This can cause a false positive situation when a portal is
// behind the camera but close. This could be fixed by having another
// culling plane at the camera location with normal same as camera direction.
for (int plane = 1; plane < 6; ++plane)
{
// set the visible flag to false
visible_flag = false;
// Skip far plane if infinite view frustum
if ((FrustumPlane)plane == FrustumPlane.Far && _farDistance == 0)
{
continue;
}
// we have to check each corner of the portal
for (int corner = 0; corner < 4; corner++)
{
PlaneSide side = _planes[plane].GetSide(portal.getDerivedCorner(corner));
if (side != PlaneSide.Negative)
{
visible_flag = true;
}
}
// if the visible_flag is still false, then this plane
// culled all the portal points
if (visible_flag == false)
{
// ALL corners on negative side therefore out of view
if (culledBy != FrustumPlane.None)
{
culledBy = (FrustumPlane)plane;
}
return(false);
}
}
}
// no plane culled all the portal points and the norm
// was facing the camera, so this portal is visible
return(true);
}
