float GetSubmergedHeight(Collidable info, float maxLength, float boundingBoxHeight, ref Vector3 rayOrigin, ref Vector3 xSpacing, ref Vector3 zSpacing, int i, int j, out Vector3 volumeCenter)
{
Ray ray;
Vector3.Multiply(ref xSpacing, i, out ray.Position);
Vector3.Multiply(ref zSpacing, j, out ray.Direction);
Vector3.Add(ref ray.Position, ref ray.Direction, out ray.Position);
Vector3.Add(ref ray.Position, ref rayOrigin, out ray.Position);
ray.Direction = upVector;
//do a bottom-up raycast.
RayHit rayHit;
//Only go up to maxLength. If it's further away than maxLength, then it's above the water and it doesn't contribute anything.
if (info.RayCast(ray, maxLength, out rayHit))
{
//Position the ray to point from the other side.
Vector3.Multiply(ref ray.Direction, boundingBoxHeight, out ray.Direction);
Vector3.Add(ref ray.Position, ref ray.Direction, out ray.Position);
Vector3.Negate(ref upVector, out ray.Direction);
float bottomY = rayHit.Location.Y;
float bottom = rayHit.T;
Vector3 bottomPosition = rayHit.Location;
if (info.RayCast(ray, boundingBoxHeight - rayHit.T, out rayHit))
{
Vector3.Add(ref rayHit.Location, ref bottomPosition, out volumeCenter);
Vector3.Multiply(ref volumeCenter, .5f, out volumeCenter);
return(Math.Min(surfacePlaneHeight - bottomY, boundingBoxHeight - rayHit.T - bottom));
}
//This inner raycast should always hit, but just in case it doesn't due to some numerical problem, give it a graceful way out.
volumeCenter = Vector3.Zero;
return(0);
}
volumeCenter = Vector3.Zero;
return(0);
}
/// <summary>
/// Locates the closest support entity by performing a raycast at collected candidates.
/// </summary>
/// <param name="supportEntity">The closest supporting entity.</param>
/// <param name="supportLocation">The support location where the ray hit the entity.</param>
/// <param name="supportNormal">The normal at the surface where the ray hit the entity.</param>
/// <param name="supportDistance">Distance from the character to the support location.</param>
/// <returns>Whether or not a support was located.</returns>
private bool FindSupport(out BEPUphysics.Entities.Entity supportEntity, out Vector3 supportLocation, out Vector3 supportNormal, out float supportDistance)
{
supportEntity = null;
supportLocation = Toolbox.NoVector;
supportNormal = Toolbox.NoVector;
supportDistance = float.MaxValue;
Vector3 rayOrigin = Body.Position + rayOriginOffset;
for (int i = 0; i < collisionPairCollector.CollisionInformation.Pairs.Count; i++)
{
var pair = collisionPairCollector.CollisionInformation.Pairs[i];
//Determine which member of the collision pair is the possible support.
Collidable candidate = (pair.BroadPhaseOverlap.EntryA == collisionPairCollector.CollisionInformation ? pair.BroadPhaseOverlap.EntryB : pair.BroadPhaseOverlap.EntryA) as Collidable;
//Ensure that the candidate is a valid supporting entity.
if (candidate.CollisionRules.Personal >= CollisionRule.NoSolver)
{
continue; //It is invalid!
}
//The maximum length is supportHeight * 2 instead of supportHeight alone because the character should be able to step downwards.
//This acts like a sort of 'glue' to help the character stick on the ground in general.
float maximumDistance;
//The 'glue' effect should only occur if the character has a solid hold on the ground though.
//Otherwise, the character is falling or sliding around uncontrollably.
if (HasTraction)
{
maximumDistance = supportHeight * 2;
}
else
{
maximumDistance = supportHeight;
}
RayHit rayHit;
//Fire a ray at the candidate and determine some details!
if (candidate.RayCast(new Ray(rayOrigin, Vector3.Down), maximumDistance, out rayHit))
{
//We want to find the closest support, so compare it against the last closest support.
if (rayHit.T < supportDistance)
{
supportDistance = rayHit.T;
supportLocation = rayHit.Location;
supportNormal = rayHit.T > 0 ? rayHit.Normal : Vector3.Up;
var entityInfo = candidate as EntityCollidable;
if (entityInfo != null)
{
supportEntity = entityInfo.Entity;
}
else
{
supportEntity = null;
}
}
}
}
supportNormal.Normalize();
return(supportDistance < float.MaxValue);
}
/// <summary>
/// Locates the closest support entity by performing a raycast at collected candidates.
/// </summary>
/// <param name="supportEntity">The closest supporting entity.</param>
/// <param name="supportLocation">The support location where the ray hit the entity.</param>
/// <param name="supportNormal">The normal at the surface where the ray hit the entity.</param>
/// <param name="supportDistance">Distance from the character to the support location.</param>
/// <returns>Whether or not a support was located.</returns>
private bool findSupport(out object supportEntityTag, out BEPUphysics.Entities.Entity supportEntity, out Vector3 supportLocation, out Vector3 supportNormal, out float supportDistance)
{
supportEntity = null;
supportEntityTag = null;
supportLocation = BEPUutilities.Toolbox.NoVector;
supportNormal = BEPUutilities.Toolbox.NoVector;
supportDistance = float.MaxValue;
const float fudgeFactor = 0.1f;
Vector3 rayOrigin = this.Body.Position;
rayOrigin.Y += fudgeFactor + this.Height * -0.5f;
for (int i = 0; i < this.collisionPairCollector.CollisionInformation.Pairs.Count; i++)
{
var pair = this.collisionPairCollector.CollisionInformation.Pairs[i];
//Determine which member of the collision pair is the possible support.
Collidable candidate = (pair.BroadPhaseOverlap.EntryA == collisionPairCollector.CollisionInformation ? pair.BroadPhaseOverlap.EntryB : pair.BroadPhaseOverlap.EntryA) as Collidable;
//Ensure that the candidate is a valid supporting entity.
if (candidate.CollisionRules.Personal >= CollisionRule.NoSolver)
{
continue; //It is invalid!
}
if (candidate.CollisionRules.Group == Character.NoCollideGroup)
{
continue;
}
//The maximum length is supportHeight * 2 instead of supportHeight alone because the character should be able to step downwards.
//This acts like a sort of 'glue' to help the character stick on the ground in general.
float maximumDistance;
//The 'glue' effect should only occur if the character has a solid hold on the ground though.
//Otherwise, the character is falling or sliding around uncontrollably.
if (this.HasTraction && !this.IsSwimming)
{
maximumDistance = fudgeFactor + (this.SupportHeight * 2.0f);
}
else
{
maximumDistance = fudgeFactor + this.SupportHeight;
}
foreach (Vector3 rayStart in this.rayOffsets.Select(x => x + rayOrigin))
{
BEPUutilities.RayHit rayHit;
// Fire a ray at the candidate and determine some details!
if (candidate.RayCast(new Ray(rayStart, Vector3.Down), maximumDistance, out rayHit))
{
Vector3 n = Vector3.Normalize(rayHit.Normal);
if (n.Y > supportNormal.Y)
{
supportNormal = n;
}
// We want to find the closest support, so compare it against the last closest support.
if (rayHit.T < supportDistance && n.Y > 0.25f)
{
supportDistance = rayHit.T - fudgeFactor;
supportLocation = rayHit.Location;
if (rayHit.T < 0.0f)
{
supportNormal = Vector3.Up;
}
var entityInfo = candidate as EntityCollidable;
if (entityInfo != null)
{
supportEntity = entityInfo.Entity;
supportEntityTag = supportEntity != null ? supportEntity.Tag : candidate.Tag;
}
else
{
supportEntityTag = candidate.Tag;
}
}
}
}
}
bool isSupported = supportDistance < float.MaxValue;
return(isSupported);
}
