public void BuildAxisAlignedRectangle(Vector3 a, Vector3 b, Vector3 normal)
{
Vector3 c = new Vector3();
Vector3 d = new Vector3();
if (a.X == b.X)
{
if (normal.X > 0)
{
c = new Vector3(a.X, a.Y, b.Z);
d = new Vector3(a.X, b.Y, a.Z);
}
else
{
c = new Vector3(a.X, b.Y, a.Z);
d = new Vector3(a.X, a.Y, b.Z);
}
}
else if (a.Y == b.Y)
{
if (normal.Y > 0)
{
c = new Vector3(b.X, a.Y, a.Z);
d = new Vector3(a.X, a.Y, b.Z);
}
else
{
c = new Vector3(a.X, a.Y, b.Z);
d = new Vector3(b.X, a.Y, a.Z);
}
}
else if (a.Z == b.Z)
{
if (normal.Z > 0)
{
c = new Vector3(a.X, b.Y, a.Z);
d = new Vector3(b.X, a.Y, a.Z);
}
else
{
c = new Vector3(b.X, a.Y, a.Z);
d = new Vector3(a.X, b.Y, a.Z);
}
}
else
return;
Indices[index++] = (int)vertex;
Indices[index++] = (int)(vertex + 1);
Indices[index++] = (int)(vertex + 2);
Indices[index++] = (int)(vertex + 2);
Indices[index++] = (int)(vertex + 3);
Indices[index++] = (int)vertex;
Vertices[vertex++] = new PositionNormal(a, normal);
Vertices[vertex++] = new PositionNormal(c, normal);
Vertices[vertex++] = new PositionNormal(b, normal);
Vertices[vertex++] = new PositionNormal(d, normal);
}
public void BuildTriangle(Vector3 a, Vector3 b, Vector3 c, Vector3 normal, bool recalculateNormal = true)
{
if (recalculateNormal)
{
Vector3 n2 = Vector3.Cross(b - a, c - a);
n2.Normalize();
if (Vector3.Dot(normal, n2) < 0)
n2 = -n2;
normal = n2;
}
Indices[index++] = (int)vertex;
Indices[index++] = (int)(vertex + 1);
Indices[index++] = (int)(vertex + 2);
Vertices[vertex++] = new PositionNormal(a, normal);
Vertices[vertex++] = new PositionNormal(b, normal);
Vertices[vertex++] = new PositionNormal(c, normal);
}