private CollisionData ProjectNormals(SatBodyData body1, SatBodyData body2)
{
Float3 dir = (body1.Center - body2.Center).Normalize();
CollisionData result = new CollisionData
{
Intersecting = true,
Depth = float.MaxValue
};
foreach (var normal in body1.Normals)
{
Projection1.ProjectVertices(body1, normal);
Projection2.ProjectVertices(body2, normal);
if (!Projection1.Overlaps(Projection2))
{
result.Intersecting = false;
return(result);
}
float depth = normal.Dot(dir) < 0.0f ? Projection1.GetMaxOverlap(Projection2) : Projection1.GetOverlap(Projection2);
if (depth < result.Depth)
{
result.Depth = depth;
result.Normal = normal;
}
}
return(result);
}
// Special SAT case for spheres
public CollisionData Test(SatBodyData body, Sphere s)
{
bool bodiesSet = body.Vertices.Length > 0 && body.Normals.Length > 0;
if (!bodiesSet)
{
Logger.Error("Bodies for SAT test not set correctly");
return(new CollisionData());
}
Logger.Error("SAT Test with sphere not implemented");
return(new CollisionData());
}
// Projects the satBody on a normal
public void ProjectVertices(SatBodyData satBody, Float3 normal)
{
Min = normal.Dot(satBody.Vertices[0]);
Max = Min;
for (int i = 1; i < satBody.Vertices.Length; i++)
{
float p = normal.Dot(satBody.Vertices[i]);
if (p < Min)
{
Min = p;
}
else if (p > Max)
{
Max = p;
}
}
}
public CollisionData Test(SatBodyData body1, SatBodyData body2)
{
bool bodiesSet = body1.Vertices.Length > 0 && body1.Normals.Length > 0 && body2.Vertices.Length > 0 && body2.Normals.Length > 0;
if (!bodiesSet)
{
Logger.Error("Bodies for SAT test not set correctly");
return(new CollisionData());
}
Projection1 = new SatProjectionData();
Projection2 = new SatProjectionData();
CollisionData c1 = ProjectNormals(body1, body2);
if (!c1.Intersecting)
{
return(c1);
}
CollisionData c2 = ProjectNormals(body2, body1);
if (!c2.Intersecting)
{
return(c2);
}
CollisionData result = c1;
if (c1.Depth < c2.Depth)
{
result = c2;
result.Normal = -1.0f * result.Normal;
}
return(result);
}
