Here’s a modified version of the particlesGpu example found in the pallet. I’ve added in some flocking functions to the shader that controls particle motion. Check out the new “Flocking” tab in the components parameter window.
Rule 1 is the force away from other boids
Rule 2 keeps the boids moving at the same velocity i think
Rule 3 is the attraction to the ball each boid is trying to follow
Rule 4 is the force toward the center of each flock
flockingGpu.tox (525 KB)
Here’s the bit of code:
[code]// rule1 avoid other boids
vec3 rule1(vec3 my_position, vec3 my_velocity, vec3 their_position, vec3 their_velocity)
{
vec3 d = my_position - their_position;
if (dot(d, d) < closest_allowed_dist)
return d;
return vec3(0.0);
}
// rule2 match the speed of other boids
vec3 rule2(vec3 my_position, vec3 my_velocity, vec3 their_position, vec3 their_velocity)
{
vec3 d = their_position - my_position;
vec3 dv = their_velocity - my_velocity;
return dv / (dot(d, d) +10.);
}
// apply flocking
vec3 flocking(in vec3 my_position, in vec3 my_velocity)
{
int i, j;
float rule1_weight = rules.x; //0.18;
float rule2_weight = rules.y; //0.05;
float rule3_weight = rules.z; //0.17;
float rule4_weight = rules.w; //0.02;
//vec3 new_pos;
vec3 new_vel;
vec3 accelleration = vec3(0.0);
vec3 flock_center = vec3(0.0);
vec3 nearest_flock = vec3(0.0);
float nearest_flock_members = 0;
vec2 my_coords = vUV.st * uMapSize.zw;
float my_attr = my_coords.x * my_coords.y;
my_attr = mod(my_attr, NUM_ATTR);
for (i = 0; i < uMapSize.z; i++)
{
for (j = 0; j < uMapSize.w; j++)
{
vec2 them = vec2( (float(i) * uMapSize.x) + (uMapSize.x/2), float(j) * uMapSize.y + (uMapSize.y/2));
vec3 their_position = texture(sTD2DInputs[POS_LIFE], them).rgb;
vec3 their_velocity = texture(sTD2DInputs[VELOCITY], them).rgb;
flock_center += their_position;
vec2 their_coords = them * uMapSize.zw;
float their_attr = their_coords.x * their_coords.y;
their_attr = mod(their_attr, NUM_ATTR);
if(their_attr == my_attr)
{
nearest_flock_members += 1.0;
nearest_flock += their_position;
}
if (them != vUV.st)
{
accelleration += rule1(my_position,
my_velocity,
their_position,
their_velocity) * rule1_weight;
accelleration += rule2(my_position,
my_velocity,
their_position,
their_velocity) * rule2_weight;
}
}
}
// travel toward goal
vec3 goal_center = vec3(0.0);
goal_center = attractors[int(my_attr)].xyz;
if(goal_center != vec3(0.0)){
accelleration += normalize(goal_center - my_position) * rule3_weight;
}
// travel toward center of flock
nearest_flock /= vec3(nearest_flock_members);
accelleration += normalize(nearest_flock - my_position) * rule4_weight;
return accelleration;
}[/code]
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