/// <summary>
/// Constructor.
/// use quad tree.
/// </summary>
/// <param name="vertices">model's vertices</param>
/// <param name="buildQuadTreeDepth">quad tree depth count</param>
public CollideModel(Vector3[] vertices, int buildQuadTreeDepth) : base()
{
this.vertices = vertices;
// Creates vector array by triangle's vertices count
this.normal = new Vector3[this.vertices.Length / 3];
// Creates normal vector by each triangle
for (int i = 0; i < this.normal.Length; i++)
{
Vector3 v1 = this.vertices[i * 3];
Vector3 v2 = this.vertices[i * 3 + 1];
Vector3 v3 = this.vertices[i * 3 + 2];
this.normal[i] = Vector3.Normalize(Vector3.Cross(v3 - v1, v2 - v1));
}
// builds quad tree.
if (buildQuadTreeDepth > 0)
{
this.quadTree = new QuadTree();
this.quadTree.Build(this.Vertices, buildQuadTreeDepth);
}
}
/// <summary>
/// Set to new transform matrix.
/// </summary>
public override void Transform(Matrix matrix)
{
if (this.QuadTree != null)
{
int nodeDepth = this.QuadTree.DepthLevel;
Matrix newTransform = matrix;
// if changed matrix, re-build quad tree and collison vertices
if (this.TransformMatrix != newTransform)
{
for (int i=0; i < this.vertices.Length; i++)
{
this.vertices[i] =
Vector3.Transform(this.vertices[i], newTransform);
}
for (int i = 0; i < this.normal.Length; i++)
{
this.normal[i] =
Vector3.Transform(this.normal[i], newTransform);
}
// re-build quad tree.
this.quadTree = null;
this.quadTree = new QuadTree();
this.quadTree.Build(this.Vertices, nodeDepth);
}
}
base.Transform(matrix);
}
