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public RayCast ( BEPUutilities.Ray ray, bool>.Func |
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| ray | BEPUutilities.Ray | Ray to test. |
| filter | bool>.Func | Delegate to prune out hit candidates before performing a ray cast against them. Return true from the filter to process an entry or false to ignore the entry. |
| result | Hit data of the ray, if any. | |
| return | bool | |
/// <summary>
/// Determines whether there is a cliff nearby.
/// </summary>
/// <param name="position">Position to look from.</param>
/// <param name="facingDirection">Direction to check in.</param>
/// <param name="filter">Anonymous function to filter out unwanted objects.</param>
/// <param name="space">The space to check for a cliff in.</param>
/// <param name="distance">The distance to check at.</param>
/// <returns>True if a cliff was detected, false otherwise.</returns>
public static bool FindCliff(Vector3 position, Vector3 facingDirection, Func<BroadPhaseEntry, bool> filter, Space space, float distance)
{
// If there is a wall before the requested distance assume there is no cliff.
Ray forwardRay = new Ray(position, new Vector3(facingDirection.X, 0, facingDirection.Z));
RayCastResult forwardResult = new RayCastResult();
space.RayCast(forwardRay, filter, out forwardResult);
if ((forwardResult.HitData.Location - position).Length() < distance)
{
return false;
}
facingDirection.Normalize();
Ray futureDownRay = new Ray(position + new Vector3(facingDirection.X * distance, 0, facingDirection.Z * distance), Vector3.Down);
RayCastResult result = new RayCastResult();
space.RayCast(futureDownRay, filter, out result);
Vector3 drop = result.HitData.Location - futureDownRay.Position;
if (drop.Y < -6.0f)
{
return true;
}
else
{
return false;
}
}
/// <summary>
/// Determines whether there is a wall nearby.
/// </summary>
/// <param name="position">Position to look from.</param>
/// <param name="facingDirection">Direction to check in.</param>
/// <param name="filter">Anonymous function to filter out unwanted objects.</param>
/// <param name="space">The space to check for a wall in.</param>
/// <param name="distance">The distance to check within.</param>
/// <returns>True if a wall was detected, false otherwise.</returns>
public static bool FindWall(Vector3 position, Vector3 facingDirection, Func<BroadPhaseEntry, bool> filter, Space space, float distance, out RayCastResult result)
{
Ray forwardRay = new Ray(position, new Vector3(facingDirection.X, 0, facingDirection.Z));
result = new RayCastResult();
space.RayCast(forwardRay, filter, out result);
Vector3 flatNormal = new Vector3(result.HitData.Normal.X, 0, result.HitData.Normal.Z);
float normalDot = Vector3.Dot(result.HitData.Normal, flatNormal);
float minDot = (float)Math.Cos(MathHelper.PiOver4) * flatNormal.Length() * result.HitData.Normal.Length();
if ((result.HitData.Location - forwardRay.Position).Length() < distance && normalDot > minDot)
{
return true;
}
else
{
return false;
}
}
