public static void GetImageSourcePositions(Vector3 sourcePosition, RoomDefinition room, int numReflection,
Vector3[] positionBuffer)
{
// validate position buffer length
if (positionBuffer.Length < GetImageSourceCount(numReflection))
{
return;
}
var imageSourcePosition = new Vector3();
for (var x = -numReflection; x <= numReflection; x++)
{
imageSourcePosition.x = x * room.size.x + ((x + 1) & 1) * sourcePosition.x +
(x & 1) * (room.size.x - sourcePosition.x);
for (var y = -numReflection; y <= numReflection; y++)
{
imageSourcePosition.y = y * room.size.y + ((y + 1) & 1) * sourcePosition.y +
(y & 1) * (room.size.y - sourcePosition.y);
for (var z = -numReflection; z <= numReflection; z++)
{
imageSourcePosition.z = z * room.size.z + ((z + 1) & 1) * sourcePosition.z +
(z & 1) * (room.size.z - sourcePosition.z);
var imageSourceIndex = (z + numReflection) +
(y + numReflection) * (numReflection * 2 + 1) +
(x + numReflection) * (int)Math.Pow((numReflection * 2 + 1), 2);
positionBuffer[imageSourceIndex] = imageSourcePosition;
}
}
}
}
private void OnDrawGizmos()
{
if (room == null)
{
room = GetComponent <RoomDefinition>();
}
Gizmos.color = Color.yellow;
Gizmos.DrawWireCube(room.size / 2.0f, room.size);
}
private void Start()
{
room = GetComponent <RoomDefinition>();
}