I need help with a simple AI

Forkaster · 2009-05-25T00:34:54

Hi, I am not entirely sure this is the correct forum for what i am about to ask, but here goes. I need to code an "AI" for a "bot" that moves around the world map randomly, but when the distance from him to the player is less or equal than a defined value the will turn to the player and run towards it. I have succeeded in writing something that works, but it has a bug that i do not understand/know how to fix. So i'll leave the code i have here with hope that some one can help me out, or give me a better suggestion typedef struct guardian { double pos_x, pos_y, pos_z; double look_at_x, look_at_y, look_at_z; double horizontal_angle; int HAS_DESTINATION; double destination_x,destination_z; }Guardian; void guardiansMoviment() { for(int i=0; i<NUMBER_OF_GUARDIANS;i++) { double dist=distanceGuardian(guardians); if(dist <= DIST_MIN) { guardians.destination_x = agent.pos_x; guardians.destination_z = agent.pos_z; guardians.HAS_DESTINATION = 1; } guardianRandomMoviment(i); destinationDirection(i); guadianStep(1,i); } } void guardianRandomMoviment(int i) { if(!guardians.HAS_DESTINATION) { guardians.destination_x = 3 + rand()/(double)RAND_MAX*(WORLD_WIDTH-6); guardians.destination_z = 3 + rand()/(double)RAND_MAX*(WORLD_LENGTH-6); guardians.HAS_DESTINATION = 1; } if(distanceGuardianDestination(guardians) <= 0.0) { guardians.HAS_DESTINATION = 0; } } void destinationDirection(int i) { double difx = guardians.pos_x - guardians.destination_x; double difz = guardians.pos_z - guardians.destination_z; double destination_angle = atan2(difx,difz) * RAD; guardians.horizontal_angle = destination_angle; guardians.look_at_x = sin(guardians.horizontal_angle); guardians.look_at_z = cos(guardians.horizontal_angle); } void guadianStep(double step,int i) { double new_pos_x = guardians.pos_x + step * (guardians.look_at_x); double new_pos_z = guardians.pos_z + step * (guardians.look_at_z); guardians.pos_x = CLAMP(new_pos_x,2,WORLD_WIDTH-3); guardians.pos_z = CLAMP(new_pos_z,2,WORLD_LENGTH-3); guardians.pos_y = terrainGetInerpolatedHeight(guardians.pos_x,guardians.pos_z) + 1.f; } The bug that occurs with the code above is that when the guardians are near (not sure of the distance) the player and if the gives a step backward/forward the guardians stop closing in on the player, they seem to be rotating in place. [Edited by - Forkaster on May 22, 2009 5:27:48 AM]

Artificial Intelligence Programming

Started by Forkaster May 22, 2009 05:09 AM

9 comments, last by wodinoneeye 15 years, 6 months ago

wodinoneeye

1,691

May 25, 2009 12:34 AM

In guardianRandomMoviment(int i)

if(distanceGuardianDestination(guardians) <= 0.0)

should have some kind of DIST_MIN value also (close enough...)

less than or equal to zero may cause a dodging action
if your movement doesnt do partial step when closer than one step from target.

Roundoffs can also make it never be 'equal zero....

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I need help with a simple AI

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I need help with a simple AI

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