void UpdateAI()
{
float bestUtilityValue = int.MaxValue;
VoxelSnakeDirection bestDirection = VoxelSnakeDirection.Up;
int utilityValue = 0;
Int3 delta;
Vector4 vBackgroundColor = backgroundColor;
Vector4 vFoodColor = foodColor;
foreach (VoxelSnakeDirection dir in Enum.GetValues(typeof(VoxelSnakeDirection)))
{
delta = GetDeltaByDirection(dir);
Int3 nextPos = (mCurrent + delta) % mWorldSize;
utilityValue = mLastFoodPosition.ManhattanDistance(nextPos);
Vector4 vNextPosVoxelColor = GetVoxelColor(nextPos);
if ((vBackgroundColor - vNextPosVoxelColor).sqrMagnitude > 0.001f &&
(vFoodColor - vNextPosVoxelColor).sqrMagnitude > 0.001f)
{
utilityValue = int.MaxValue;
}
if (utilityValue < bestUtilityValue)
{
bestUtilityValue = utilityValue;
bestDirection = dir;
}
}
currentSnakeDirection = bestDirection;
}
Int3 GetDeltaByDirection(VoxelSnakeDirection dir)
{
if (dir == VoxelSnakeDirection.Forward)
{
return(new Int3(0, 0, 1));
}
else if (dir == VoxelSnakeDirection.Backward)
{
return(new Int3(0, 0, -1));
}
else if (dir == VoxelSnakeDirection.Left)
{
return(new Int3(-1, 0, 0));
}
else if (dir == VoxelSnakeDirection.Right)
{
return(new Int3(1, 0, 0));
}
else if (dir == VoxelSnakeDirection.Down)
{
return(new Int3(0, -1, 0));
}
else if (dir == VoxelSnakeDirection.Up)
{
return(new Int3(0, 1, 0));
}
// Up
return(new Int3(0, 1, 0));
}
