public bool RayIntersection(Ray ray, out int x, out int z)
{
// generate a bounding box for the heightmap in its local space
AxisAlignedBox axisAlignedBox = new AxisAlignedBox(new Vector3(0, minHeight, 0),
new Vector3(width, maxHeight, height));
Vector3 rayLoc = new Vector3((ray.Origin.x - offsetX) / xzScale,
ray.Origin.y / yScale,
(ray.Origin.z - offsetZ) / xzScale);
Vector3 rayDir = new Vector3(ray.Direction.x / xzScale, ray.Direction.y / yScale, ray.Direction.z / xzScale);
rayDir.Normalize();
// convert the ray to local heightmap space
Ray tmpRay = new Ray(rayLoc, rayDir);
// see if the ray intersects with the bounding box
IntersectResult result = tmpRay.Intersects(axisAlignedBox);
if (result.Hit)
{
// move rayLoc up to just before the point of intersection
rayLoc = rayLoc + rayDir * ( result.Distance - 1 );
//
// deal with edge case where ray is coming from outside the heightmap
// and is very near edge of map at intersection.
//
int insideCounter = 20;
while ((!Inside(rayLoc)) && (insideCounter > 0))
{
rayLoc += ( rayDir * 0.1f );
insideCounter--;
}
if (insideCounter == 0)
{
x = 0;
z = 0;
return false;
}
x = (int)Math.Round(rayLoc.x);
z = (int)Math.Round(rayLoc.z);
if (x < 0)
{
x = 0;
}
if (x >= width)
{
x = width - 1;
}
if (z < 0)
{
z = 0;
}
if (z >= height)
{
z = height - 1;
}
bool above = rayLoc.y > heightData[x + z * width];
while (Inside(rayLoc))
{
// increment the ray
rayLoc += rayDir;
x = (int)Math.Round(rayLoc.x);
z = (int)Math.Round(rayLoc.z);
if (x < 0)
{
x = 0;
}
if (x >= width)
{
x = width - 1;
}
if (z < 0)
{
z = 0;
}
if (z >= height)
{
z = height - 1;
}
if (above != (rayLoc.y > heightData[x + z * width]))
{
// we found a hit
return true;
}
}
}
x = 0;
z = 0;
return false;
}
// By the time this method is called, we know for sure that
// the object has collision volumes.
protected float CheckCollisionWithCollisionShapes(ObjectNode objNode, Ray ray)
{
float distance = float.MaxValue;
if (objNode.Collider != null)
{
MovingObject mo = objNode.Collider;
foreach (MovingPart part in mo.parts)
{
CollisionShape partShape = mo.parts[0].shape;
// Check for intersection of a line 1000 meters long from the ray origin toward the ray direction
float distanceToShape = partShape.RayIntersectionDistance(ray.Origin, ray.Origin + ray.Direction * (1000f * OneMeter));
if (distanceToShape == float.MaxValue)
continue;
else if (distanceToShape < distance)
distance = distanceToShape;
}
}
else if (objNode.CollisionShapes != null)
{
foreach (CollisionShape shape in objNode.CollisionShapes)
{
// Check for intersection of a line 1000 meters long from the ray origin toward the ray direction
float distanceToShape = shape.RayIntersectionDistance(ray.Origin, ray.Origin + ray.Direction * (1000f * OneMeter));
if (distanceToShape == float.MaxValue)
continue;
else if (distanceToShape < distance)
{
// log.DebugFormat("Client.CheckCollisionWithCollisionShapes: objNode {0}, distanceToShape {1}, shape {2}",
// objNode.Name,distanceToShape, shape);
distance = distanceToShape;
}
}
}
return distance;
}
protected bool CheckCollision(Ray ray, SceneObject sceneObj, out float t)
{
t = float.MaxValue;
if (!(sceneObj is Entity))
return false;
bool intersect = false;
Entity entity = (Entity)sceneObj;
VertexData vData;
if (entity.Mesh.HasSkeleton) {
// The blended vertex buffers have already been transformed
for (int i = 0; i < entity.SubEntityCount; ++i) {
SubEntity subEntity = entity.GetSubEntity(i);
if (!subEntity.IsVisible)
continue;
if (subEntity.SubMesh.useSharedVertices)
vData = entity.SharedBlendedVertexData;
else
vData = subEntity.BlendedVertexData;
IndexData iData = subEntity.SubMesh.indexData;
if (CheckCollision(vData, iData, ray.Origin, ray.Direction, ref t))
intersect = true;
}
} else {
// Transform the ray based on the inverse of the sceneObj transform, so
// we don't need to transform each point in the submesh.
Matrix4 inverseTransform = sceneObj.ParentNodeFullTransform.Inverse();
Vector3 origin = inverseTransform * ray.Origin;
Vector3 direction = (inverseTransform * (ray.Origin + ray.Direction)) - origin;
for (int i = 0; i < entity.SubEntityCount; ++i) {
SubEntity subEntity = entity.GetSubEntity(i);
if (!subEntity.IsVisible)
continue;
if (subEntity.SubMesh.useSharedVertices)
vData = entity.Mesh.SharedVertexData;
else
vData = subEntity.SubMesh.vertexData;
IndexData iData = subEntity.SubMesh.indexData;
if (CheckCollision(vData, iData, origin, direction, ref t))
intersect = true;
}
}
return intersect;
}
public Vector3 PickTerrain(Ray pointRay)
{
Axiom.Core.RaySceneQuery q = scene.CreateRayQuery(pointRay);
q.QueryMask = (ulong)Axiom.SceneManagers.Multiverse.RaySceneQueryType.FirstTerrain;
List<RaySceneQueryResultEntry> results = q.Execute();
if (results.Count > 0)
{
RaySceneQueryResultEntry result = results[0];
return (result.worldFragment.SingleIntersection);
}
else
{
return Vector3.Zero;
}
}
/// <summary>
/// This overloading permits the user to pass in a query mask
/// mouseX and mouseY are in terms of Overlay coordinates
/// (0 to 1 starting from the upper left corner of the screen).
/// </summary>
/// <param name="mouseX"></param>
/// <param name="mouseY"></param>
/// <param name="queryMas"></param>
/// <returns></returns>
public ObjectNode CastRay(float mouseX, float mouseY, ulong queryMask)
{
Ray ray = camera.GetCameraToViewportRay(mouseX, mouseY);
#if NOT
Vector3 origin, direction;
float winWidth = (float)(2 * camera.Near *
Math.Tan(MathUtil.DegreesToRadians(camera.FOV / 2)));
direction.x = (mouseX - .5f) * winWidth;
direction.y = (.5f - mouseY) * winWidth / camera.AspectRatio;
direction.z = -camera.Near;
origin = camera.Position;
direction = camera.Orientation * direction;
Ray ray = new Ray(origin, direction);
#endif
RaySceneQuery query = scene.CreateRayQuery(ray, queryMask);
query.SortByDistance = true;
List<RaySceneQueryResultEntry> results = query.Execute();
if (results.Count == 0)
return null;
MovableObject closestObj = null;
float closestMatch = float.MaxValue;
// Check that the picked object is not terrain, not a prop, and
// that it is the closest object.
foreach (RaySceneQueryResultEntry result in results)
{
MovableObject sceneObj = result.SceneObject;
if (sceneObj == null || sceneObj.UserData == null || !(sceneObj.UserData is ObjectNode))
continue;
// Skip player and buildings (props)
ObjectNode objNode = (ObjectNode)sceneObj.UserData;
float distanceToObject = result.Distance;
bool hitCollisionVolume = false;
if (targetBasedOnCollisionVolumes)
{
// If there are are no collision shapes to collide
// with, fall back to the distance to the bounding
// box.
if ((objNode.Collider != null && objNode.Collider.parts.Count > 0) ||
(objNode.CollisionShapes != null && objNode.CollisionShapes.Count > 0))
{
float previousDistance = distanceToObject;
distanceToObject = CheckCollisionWithCollisionShapes(objNode, ray);
hitCollisionVolume = true;
// log.DebugFormat("Client.CastRay: objNode {0}, distanceToObject {1}, previousDistance {2}",
// objNode.Name, distanceToObject, previousDistance);
}
}
float dist;
#if PER_POLY_PICKING
if (!CheckCollision(ray, sceneObj, out dist))
continue;
#else
// If we aren't doing the per-poly stuff, we would use this instead.
dist = distanceToObject;
#endif
if (dist < closestMatch)
{
// If the closest thing is a collision volume, and
// it's not targetable and not the player, set
// closestObj to null.
if (!objNode.Targetable && objNode != worldManager.Player && hitCollisionVolume)
{
closestMatch = dist;
closestObj = null;
}
else if (objNode.Targetable)
{
closestMatch = dist;
closestObj = sceneObj;
}
}
}
if (closestObj == null)
return null;
else
return closestObj.UserData as ObjectNode;
}
/// <summary>
/// <see cref="RaySceneQuery"/>
/// </summary>
public void Execute(IRaySceneQueryListener listener, Camera camera)
{
clearFragmentList();
// if the world is not initialized, then just quit out now with no hits
if (!TerrainManager.Instance.Initialized)
{
return;
}
ulong mask = QueryMask;
SceneQuery.WorldFragment frag;
bool terrainQuery = (mask & (ulong)RaySceneQueryType.AllTerrain) != 0 || (mask & (ulong)RaySceneQueryType.FirstTerrain) != 0;
// if the query is a terrain query that is exactly vertical, then force it into the "Height" fastpath
if (((mask & (ulong)RaySceneQueryType.Height) != 0) || (terrainQuery && (this.Ray.Direction.x == 0.0f) && (this.Ray.Direction.z == 0.0f)))
{
// we don't want to bother checking for entities because a
// UNIT_Y ray is assumed to be a height test, not a ray test
frag = new SceneQuery.WorldFragment();
fragmentList.Add(frag);
frag.FragmentType = WorldFragmentType.SingleIntersection;
Vector3 origin = this.Ray.Origin;
origin.y = 0; // ensure that it's within bounds
frag.SingleIntersection = getHeightAt(origin);
listener.OnQueryResult(frag, Math.Abs(frag.SingleIntersection.y - this.Ray.Origin.y));
}
else
{
// Check for all entity contacts
if ((mask & (ulong)RaySceneQueryType.Entities) != 0)
{
base.Execute(listener);
}
// Check for contact with the closest entity triangle
// or all entity triangles. Ignores entities that
// don't have a TriangleIntersector associated with
// their meshes.
bool firstTriangleQuery = (mask & (ulong)(RaySceneQueryType.FirstEntityTriangle)) != 0;
bool allTrianglesQuery = (mask & (ulong)(RaySceneQueryType.AllEntityTriangles)) != 0;
if (firstTriangleQuery | allTrianglesQuery)
{
rayOrigin = this.ray.Origin;
// Start by getting the entities whose bounding
// boxes intersect the ray. If there are none,
// we're done.
List<MovableObject> candidates = new List<MovableObject>();
foreach (Dictionary<string, MovableObject> objectMap in creator.MovableObjectMaps)
{
foreach (MovableObject obj in objectMap.Values)
{
// skip if unattached or filtered out by query flags
if (!obj.IsAttached || (obj.QueryFlags & queryMask) == 0)
continue;
// test the intersection against the world bounding box of the entity
IntersectResult results = MathUtil.Intersects(ray, obj.GetWorldBoundingBox());
if (results.Hit)
candidates.Add(obj);
}
}
// Get the camera.Near value
Camera cam = camera;
float nearDistance = cam.Near;
float closestDistance = float.MaxValue;
Vector3 closestIntersection = Vector3.Zero;
Entity closestEntity = null;
List<EntityAndIntersection> allEntities = new List<EntityAndIntersection>();
foreach (MovableObject obj in candidates)
{
// skip if unattached or filtered out by query flags
if (!obj.IsAttached || (obj.QueryFlags & queryMask) == 0)
continue;
Entity entity = obj as Entity;
if (entity == null)
continue;
// skip if its mesh doesn't have triangles
if (entity.Mesh == null || entity.Mesh.TriangleIntersector == null)
continue;
// transform the ray to the space of the mesh
Matrix4 inverseTransform = entity.ParentNodeFullTransform.Inverse();
Matrix4 inverseWithoutTranslation = inverseTransform;
inverseWithoutTranslation.Translation = Vector3.Zero;
Vector3 transformedOrigin = inverseTransform * ray.Origin;
Ray transformedRay = new Ray(transformedOrigin,
(inverseWithoutTranslation * ray.Direction).ToNormalized());
// test the intersection against the world bounding box of the entity
Vector3 untransformedIntersection;
if (entity.Mesh.TriangleIntersector.ClosestRayIntersection(transformedRay, Vector3.Zero,
nearDistance, out untransformedIntersection))
{
Vector3 intersection = entity.ParentNodeFullTransform * untransformedIntersection;
if (allTrianglesQuery)
allEntities.Add(new EntityAndIntersection(entity, intersection));
float distance = (ray.Origin - intersection).Length;
if (firstTriangleQuery && distance < closestDistance)
{
closestDistance = distance;
closestEntity = entity;
closestIntersection = intersection;
}
}
}
if (firstTriangleQuery && closestEntity != null)
{
frag = new SceneQuery.WorldFragment();
fragmentList.Add(frag);
frag.FragmentType = WorldFragmentType.SingleIntersection;
frag.SingleIntersection = closestIntersection;
listener.OnQueryResult(frag, closestDistance);
}
else if (allTrianglesQuery && allEntities.Count > 0)
{
allEntities.Sort(distanceToCameraCompare);
foreach (EntityAndIntersection ei in allEntities)
listener.OnQueryResult(ei.entity, (rayOrigin - ei.intersection).Length);
}
}
if (terrainQuery)
{
Vector3 ray = Ray.Origin;
Vector3 land = getHeightAt(ray);
float dist = 0, resFactor = TerrainManager.oneMeter;
// find the larger of x and z directions of the ray direction
float maxXZ = Math.Max(Math.Abs(Ray.Direction.x), Math.Abs(Ray.Direction.z));
// Only bother if the non-default mask has been set
if ((mask & (ulong)RaySceneQueryType.OnexRes) != 0)
{
if ((mask & (ulong)RaySceneQueryType.TwoxRes) != 0)
{
resFactor = TerrainManager.oneMeter / 2;
}
else if ((mask & (ulong)RaySceneQueryType.FourxRes) != 0)
{
resFactor = TerrainManager.oneMeter / 4;
}
else if ((mask & (ulong)RaySceneQueryType.EightxRes) != 0)
{
resFactor = TerrainManager.oneMeter / 8;
}
}
// this scales the res factor so that we move along the ray by a distance that results
// in shift of one meter along either the X or Z axis (whichever is longer)
resFactor = resFactor / maxXZ;
SubPageHeightMap sp;
// bool east = false; (unused)
// bool south = false; (unused)
// if ( Ray.Origin.x > 0 )
// {
// east = true;
// }
// if ( Ray.Origin.z > 0 )
// {
// south = true;
// }
ray = Ray.Origin;
sp = TerrainManager.Instance.LookupSubPage(ray);
while (sp != null)
{
SubPageHeightMap newsp;
AxisAlignedBox tileBounds = sp.BoundingBox;
IntersectResult intersect = MathUtil.Intersects(Ray, tileBounds);
if (intersect.Hit)
{
// step through this tile
while ((newsp = TerrainManager.Instance.LookupSubPage(RoundRay(ray))) == sp)
{
land = getHeightAt(ray);
if (ray.y < land.y)
{
frag = new SceneQuery.WorldFragment();
fragmentList.Add(frag);
frag.FragmentType = WorldFragmentType.SingleIntersection;
frag.SingleIntersection = land;
listener.OnQueryResult(frag, dist);
if ((mask & (ulong)RaySceneQueryType.FirstTerrain) != 0)
{
return;
}
}
ray += Ray.Direction * resFactor;
dist += 1 * resFactor;
}
// if we fall off the end of the above loop without getting a hit, then the hit should be
// right at the far edge of the tile, so handle that case.
land = getHeightAt(ray);
if (ray.y < land.y)
{
frag = new SceneQuery.WorldFragment();
fragmentList.Add(frag);
frag.FragmentType = WorldFragmentType.SingleIntersection;
frag.SingleIntersection = land;
listener.OnQueryResult(frag, dist);
//LogManager.Instance.Write("MVSM:RaySceneQuery:End of tile ray collision");
if ((mask & (ulong)RaySceneQueryType.FirstTerrain) != 0)
{
return;
}
}
else
{
//LogManager.Instance.Write("MVSM:RaySceneQuery:End of tile reached without expected intersection");
}
}
else
{
// step over this tile
while ((newsp = TerrainManager.Instance.LookupSubPage(RoundRay(ray))) == sp)
{ // XXX - this is not the most efficient method...
ray += Ray.Direction * resFactor;
dist += 1 * resFactor;
}
}
sp = newsp;
}
}
}
}
public Vector3 ObjectPlacementLocation(Vector3 objPosition)
{
Ray pointRay = new Ray(new Vector3(objPosition.x, camera.Position.y, objPosition.z), Vector3.NegativeUnitY);
Axiom.Core.RaySceneQuery q = scene.CreateRayQuery(pointRay);
q.QueryMask = (ulong)Axiom.SceneManagers.Multiverse.RaySceneQueryType.AllEntityTriangles;
List<RaySceneQueryResultEntry> results = q.Execute();
if (results.Count > 0)
{
foreach (RaySceneQueryResultEntry result in results)
{
IWorldObject obj = DisplayObject.LookupName(result.SceneObject.Name);
if (obj is StaticObject && obj.AcceptObjectPlacement)
{
Vector3 position = pointRay.Origin + (pointRay.Direction * result.Distance);
return position;
}
}
}
return PickTerrain(pointRay);
}
/// <summary>
/// Creates a query to return objects found along the ray.
/// </summary>
/// <param name="ray">Ray to use for the intersection query.</param>
/// <returns>A specialized implementation of RaySceneQuery for this scene manager.</returns>
public virtual RaySceneQuery CreateRayQuery(Ray ray)
{
return CreateRayQuery(ray, 0xffffffff);
}
/// <summary>
/// Creates a query to return objects found along the ray.
/// </summary>
/// <param name="ray">Ray to use for the intersection query.</param>
/// <returns>A specialized implementation of RaySceneQuery for this scene manager.</returns>
public virtual RaySceneQuery CreateRayQuery(Ray ray, ulong mask)
{
DefaultRaySceneQuery query = new DefaultRaySceneQuery(this);
query.Ray = ray;
query.QueryMask = mask;
return query;
}
public override Axiom.Core.RaySceneQuery CreateRayQuery(Ray ray)
{
return CreateRayQuery(ray, defaultRayQueryFlags);
}
/// <summary>
/// Creates a RaySceneQuery for this scene manager.
/// </summary>
/// <param name="ray">Details of the ray which describes the region for this query.</param>
/// <param name="mask">The query mask to apply to this query; can be used to filter out certain objects; see SceneQuery for details.</param>
/// <returns>
/// The instance returned from this method must be destroyed by calling
/// SceneManager::destroyQuery when it is no longer required.
/// </returns>
/// <remarks>
/// This method creates a new instance of a query object for this scene manager,
/// looking for objects which fall along a ray. See SceneQuery and RaySceneQuery
/// for full details.
/// </remarks>
public override Axiom.Core.RaySceneQuery CreateRayQuery(Ray ray, ulong mask)
{
Axiom.Core.RaySceneQuery q = new Axiom.SceneManagers.Multiverse.RaySceneQuery(this);
q.Ray = ray;
q.QueryMask = mask;
return q;
}
/// <summary>
/// Creates a RaySceneQuery for this scene manager.
/// </summary>
/// <remarks>
/// This method creates a new instance of a query object for this scene manager,
/// looking for objects which fall along a ray. See SceneQuery and RaySceneQuery
/// for full details.
/// </remarks>
/// <param name="ray">Details of the ray which describes the region for this query.</param>
/// <param name="mask">The query mask to apply to this query; can be used to filter out certain objects; see SceneQuery for details.</param>
public override RaySceneQuery CreateRayQuery(Ray ray, ulong mask)
{
BspRaySceneQuery q = new BspRaySceneQuery(this);
q.Ray = ray;
q.QueryMask = mask;
return q;
}
protected virtual void ProcessNode(BspNode node, Ray tracingRay, float maxDistance, float traceDistance)
{
// check if ray already encountered a solid brush
if (StopRayTracing) return;
if (node.IsLeaf)
{
ProcessLeaf(node, tracingRay, maxDistance, traceDistance);
return;
}
IntersectResult result = tracingRay.Intersects(node.SplittingPlane);
if (result.Hit)
{
if (result.Distance < maxDistance)
{
if (node.GetSide(tracingRay.Origin) == PlaneSide.Negative)
{
ProcessNode(node.BackNode, tracingRay, result.Distance, traceDistance);
Vector3 splitPoint = tracingRay.Origin + tracingRay.Direction * result.Distance;
ProcessNode(node.FrontNode, new Ray(splitPoint, tracingRay.Direction), maxDistance - result.Distance, traceDistance + result.Distance);
}
else
{
ProcessNode(node.FrontNode, tracingRay, result.Distance, traceDistance);
Vector3 splitPoint = tracingRay.Origin + tracingRay.Direction * result.Distance;
ProcessNode(node.BackNode, new Ray(splitPoint, tracingRay.Direction), maxDistance - result.Distance, traceDistance + result.Distance);
}
}
else
ProcessNode(node.GetNextNode(tracingRay.Origin), tracingRay, maxDistance, traceDistance);
}
else
ProcessNode(node.GetNextNode(tracingRay.Origin), tracingRay, maxDistance, traceDistance);
}
protected virtual void ProcessLeaf(BspNode leaf, Ray tracingRay, float maxDistance, float traceDistance)
{
MovableObjectCollection objects = leaf.Objects;
int numObjects = objects.Count;
//Check ray against objects
for(int a = 0; a < numObjects; a++)
{
MovableObject obj = objects[a];
// Skip this object if collision not enabled
if((obj.QueryFlags & queryMask) == 0)
continue;
//Test object as bounding box
IntersectResult result = tracingRay.Intersects(obj.GetWorldBoundingBox());
// if the result came back positive and intersection point is inside
// the node, fire the event handler
if(result.Hit && result.Distance <= maxDistance)
{
listener.OnQueryResult(obj, result.Distance + traceDistance);
}
}
PlaneBoundedVolume boundedVolume = new PlaneBoundedVolume(PlaneSide.Positive);
BspBrush intersectBrush = null;
float intersectBrushDist = float.PositiveInfinity;
// Check ray against brushes
for (int brushPoint=0; brushPoint < leaf.SolidBrushes.Length; brushPoint++)
{
BspBrush brush = leaf.SolidBrushes[brushPoint];
if (brush == null) continue;
boundedVolume.planes = brush.Planes;
IntersectResult result = tracingRay.Intersects(boundedVolume);
// if the result came back positive and intersection point is inside
// the node, check if this brush is closer
if(result.Hit && result.Distance <= maxDistance)
{
if (result.Distance < intersectBrushDist)
{
intersectBrushDist = result.Distance;
intersectBrush = brush;
}
}
}
if (intersectBrush != null)
{
listener.OnQueryResult(intersectBrush.Fragment, intersectBrushDist + traceDistance);
StopRayTracing = true;
}
}
