/// <summary>
/// Visualizes the BoundingSpheres of a ModelGeo. This method should be properly be moved to the ModelGeo class
/// </summary>
/// <param name="m"></param>
/// <param name="c"></param>
public static void ShowBoundingSpheres(ModelGeo m, Color c)
{
BoundingSphere bs;
for (int i = 0; i < m.BoundingSpheres.Count; i++)
{
bs = m.GetBoundingSphere(i);
AddSphere(Matrix.CreateScale(bs.Radius) * Matrix.CreateTranslation(bs.Center), c, false);
}
}
/// <summary>
/// Returns true/false based on whether the segment defined by a and b intersects
/// the model m's bounding spheres.
/// meshInd report the specific mesh being intersected
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
/// <param name="m"></param>
/// <returns></returns>
public static bool IntersectSegmentBSphere(Vector3 a, Vector3 b, ModelGeo m, out int meshInd)
{
//BoundingSphere bs;
float t = 0;
Vector3 q = Vector3.Zero;
meshInd = -1;
Vector3 norm = Vector3.Normalize(b - a);
for (int i = 0; i < m.BoundingSpheres.Count; i++)
{
if (IntersectRaySphere(a, norm, m.GetBoundingSphere(i), ref t, ref q) && t <= (a - b).Length())
{
meshInd = i;
CollisionData.NewEvent(i, -1, norm, -norm);
//return true;
}
}
//*/
return CollisionData.Event; // false;
}
/// <summary>
/// Collision between bounding spheres for c1 and c2
/// Andre Berthiaume, 2008
/// </summary>
/// <param name="c1"></param>
/// <param name="c2"></param>
/// <returns>True if a collision is detected, false otherwise.</returns>
private static bool CollisionSphereSphere(ModelGeo c1, ModelGeo c2)
{
BoundingSphere c1BoundingSphere, c2BoundingSphere;
for (int i = 0; i < c1.BoundingSpheres.Count; i++)
{
// Check whether the bounding spheres intersect.
c1BoundingSphere = c1.GetBoundingSphere(i);
//Monitor.AddMessage("c1: " + c1BoundingSphere.Center);
for (int j = 0; j < c2.BoundingSpheres.Count; j++)
{
c2BoundingSphere = c2.GetBoundingSphere(j);
//Monitor.AddMessage("c2: " + c2BoundingSphere.Center);
if (c1BoundingSphere.Intersects(c2BoundingSphere))
{
//Console.WriteLine("Sphere Sphere col");
n1 = c2BoundingSphere.Center - c1BoundingSphere.Center;
n2 = -n1;
CollisionData.NewEvent(i, j, n1, n2);
//return true;
}
// Comparison Counter (pedagogical value only)
mComparisonCounter++;
}
}
return CollisionData.Event;
}
/// <summary>
/// Returns wether a models's bounding spheres (of meshes) collides with a terrain
/// </summary>
/// <param name="c1"></param>
/// <param name="t"></param>
/// <returns></returns>
private static bool CollisionSphereTerrain(ModelGeo c1, Terrain t)
{
BoundingSphere c1BoundingSphere;
//for (int i = 0; i < c1.mModel.Meshes.Count; i++)
for (int i = 0; i < c1.BoundingSpheres.Count; i++)
{
//c1BoundingSphere = c1.mModel.Meshes[i].BoundingSphere;
//c1BoundingSphere.Center = Vector3.Transform(c1BoundingSphere.Center, c1.mModel.Bones[i].Transform * c1.mMatWorld);
//c1BoundingSphere.Radius *= c1.mMaxScale;
c1BoundingSphere = c1.GetBoundingSphere(i);
if (c1BoundingSphere.Center.Y - t.GetHeight(c1BoundingSphere.Center) <= c1BoundingSphere.Radius)
{
n2 = t.GetNormal(c1BoundingSphere.Center);
n1 = -n2;
CollisionData.NewEvent(i, -1, n1, n2);
//return true;
}
}
//Console.WriteLine(c2.mModel.Meshes[0].MeshParts[0]. );
//return false;
return CollisionData.Event;
}
/// <summary>
/// Bounding sphere-Mesh collision test
/// Andre Berhtiaume, 2008
/// </summary>
/// <param name="m1"></param>
/// <param name="m2"></param>
/// <returns>True if a collision is detected, false otherwise.</returns>
private static bool CollisionMeshBoundingSphere(ModelGeo m1, ModelGeo m2)
{
for (int i = 0; i < m2.BoundingSpheres.Count; i++)
{
if (CollisionMeshBoundingSphere(m1, i, m2.GetBoundingSphere(i)))
{
return true;
}
}
return false;
}
