//Gets a division IB, generated by an array of vertices
//if exclusive is on then only the geometry generated exclusively with the vertices is returned (only primitves that are made up entirely by vertices from vertices parameter)
//vertices must hold short objects that hold vertices indices
public IndexBuffer GetGeneratedDivisionIB(System.Collections.ArrayList vertices, bool exclusive)
{
//Alert - GettingGeneratedDivisionIB
if (this.GettingGeneratedDivisionIB != null)
{
this.GettingGeneratedDivisionIB(new GettingGeneratedDivisionIBInfo(GettingGeneratedDivisionIBStage.Starting, -1));
}
//open the geometry information for use
short[] indices;
indices = (short[])this._IB.Lock(0, 0);
//can only use TriangleList or LineList for now, if other is used then announce the user
if (step == 0)
{
throw new ExceptionGeometry("Cannot handle other primitive type than TriangleList or LineList for now. CANNOT GENERATE DIVISION! (change the primitve type to one of these)");
}
//holds all the primitves found
System.Collections.ArrayList primitives;
primitives = new System.Collections.ArrayList();
int i, k;
//Alert - GettingGeneratedDivisionIB
if (this.GettingGeneratedDivisionIB != null)
{
this.GettingGeneratedDivisionIB(new GettingGeneratedDivisionIBInfo(GettingGeneratedDivisionIBStage.CheckingPrimitive, -1));
}
//for each primitve
for (i = 0; i <= this.NumIndices - 1; i += step)
{
//Alert - GettingGeneratedDivisionIB
if ((this.GettingGeneratedDivisionIB != null) && (this.FrequentAlerts))
{
this.GettingGeneratedDivisionIB(new GettingGeneratedDivisionIBInfo(GettingGeneratedDivisionIBStage.CheckingPrimitive, i / step));
}
short[] prim; //primitve to hold this current triangle/array in case of needing to be added later
prim = new short[step];
bool foundOne = false, foundAll = true;
//for each vertex of this current primitve
for (k = 0; k <= step - 1; k++)
{
prim[k] = indices[i + k];
if (Misc.ArrayListContainsInt(vertices, indices[i + k]))
{
foundOne = true;
}
else
{
foundAll = false;
}
}
//see if this primitive should be added or not
bool add = false;
if (exclusive == true)
{
if (foundAll == true)
{
add = true;
}
}
else
{
if (foundOne == true)
{
add = true;
}
}
//add this primitve (which was hold in prim) if case
if (add == true)
{
primitives.Add(prim);
}
}
this._IB.Unlock();
//Alert - GettingGeneratedDivisionIB
if (this.GettingGeneratedDivisionIB != null)
{
this.GettingGeneratedDivisionIB(new GettingGeneratedDivisionIBInfo(GettingGeneratedDivisionIBStage.WriteNewIB, -1));
}
//an IB that will hold our division - must transfer the primitves found to it
IndexBuffer genIB;
genIB = new IndexBuffer(typeof(short), primitives.Count * step, this.Device, Usage.SoftwareProcessing, Pool.Default);
indices = (short[])genIB.Lock(0, 0);
i = 0;
foreach (short[] prim in primitives)
{
for (k = 0; k <= step - 1; k++)
{
indices[i + k] = prim[k];
}
i += step;
}
genIB.Unlock();
return(genIB);
}
