public TV_2DVECTOR Wander()
{
int Sign = m_Random.Next(0, 1);
float Number = (float)m_Random.NextDouble();
if (Sign == 0)
Number = -Number;
m_Settings.WanderTarget += new TV_2DVECTOR(Number * m_Settings.WanderJitter, Number * m_Settings.WanderJitter);
m_Math.TVVec2Normalize(ref m_Settings.WanderTarget, m_Settings.WanderTarget);
m_Settings.WanderTarget *= m_Settings.WanderRadius;
TV_2DVECTOR TargetLocal = m_Settings.WanderTarget + new TV_2DVECTOR(m_Settings.WanderDistance, 0);
return TargetLocal - m_Position;
}
Steering Behaviors: Wandering problem
May 24, 2008 06:11 AM
I'm having a problem with my wandering function here. Does anyone see what's wrong with it?
May 24, 2008 08:18 AM
It would be easier if you were to tell us what sort of problem you are having.
Dave Mark - President and Lead Designer of Intrinsic Algorithm LLC
Professional consultant on game AI, mathematical modeling, simulation modeling
Co-founder and 10 year advisor of the GDC AI Summit
Author of the book, Behavioral Mathematics for Game AI
Blogs I write:
IA News - What's happening at IA | IA on AI - AI news and notes | Post-Play'em - Observations on AI of games I play
"Reducing the world to mathematical equations!"
May 24, 2008 08:44 AM
The wandering should appear like it is random, but it seems my bot is always going in the same direction: the origin (0, 0). This is not how it is supposed to work.
220
May 26, 2008 12:05 AM
m_Settings.WanderTarget += new TV_2DVECTOR(Number * m_Settings.WanderJitter, Number * m_Settings.WanderJitter);According to this line and the ones following it, it seems to be that you will always jiiter between either (WanderRadius, WanderRadius) or (-WanderRadius, -WanderRadius).
TV_2DVECTOR TargetLocal = m_Settings.WanderTarget + new TV_2DVECTOR(m_Settings.WanderDistance, 0);I can't make sense of this line. Why are you adding an offset to what I assume is the x coordinate?
return TargetLocal - m_Position;so what is this method actually supposed to return? That isnt clear, and is probably your main problem.
May 26, 2008 06:38 AM
I'll take a look at it. By the way the function should return the total steering force.
573
May 26, 2008 03:43 PM
I don't mean to sound rude, but have you actually tried to debug your code? Step through the instructions and see what happens to your variables?
You normalize WanderTarget, which means that it will be at exactly 1 unit from origin, you then scale it using a radius and add an offset to its X value (as Steadtler pointed out).
If you read your return value line, you're substracting a LOCAL offset with a WORLD position. Seems like you should only be returning TargetLocal.
Edit: Also you're normalizing a vector that could be of length 0 if Number or WanderJitter is 0...
You normalize WanderTarget, which means that it will be at exactly 1 unit from origin, you then scale it using a radius and add an offset to its X value (as Steadtler pointed out).
If you read your return value line, you're substracting a LOCAL offset with a WORLD position. Seems like you should only be returning TargetLocal.
Edit: Also you're normalizing a vector that could be of length 0 if Number or WanderJitter is 0...
May 26, 2008 11:09 PM
Good call. When in doubt, step through with a ton of watches open. Debugging 101.
Dave Mark - President and Lead Designer of Intrinsic Algorithm LLC
Professional consultant on game AI, mathematical modeling, simulation modeling
Co-founder and 10 year advisor of the GDC AI Summit
Author of the book, Behavioral Mathematics for Game AI
Blogs I write:
IA News - What's happening at IA | IA on AI - AI news and notes | Post-Play'em - Observations on AI of games I play
"Reducing the world to mathematical equations!"
May 27, 2008 12:00 AM
I did try to debug it, but I couldn't find what I was doing wrong. I'll take a look at the things you said.
Thnx for all the good replies.
Thnx for all the good replies.
This topic is closed to new replies.
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