// map num from [0, 1emax] to [0, 1]
public static float exp(int num, int max) {
int i = 0;
float ratio = 0;
for (; i <= max; i++) {
ratio = (float) (num / Math.pow(10, i));
if (ratio >= 0 && ratio < 10) break;
}
return (float) i / max + 1.0f / max * ratio / 10;
}
boolean intersect(Ray r, Hit h, Range range) {
// ToDo:
boolean retVal = false;
double Aq = r.getDirection().dot(r.getDirection());
double Bq =
2
* r.getDirection()
.dot(
new Vector3d(
r.getOrigin().x - center.x,
r.getOrigin().y - center.y,
r.getOrigin().z - center.z));
double Cq =
(Math.pow(r.getOrigin().x - center.x, 2)
+ Math.pow(r.getOrigin().y - center.y, 2)
+ Math.pow(r.getOrigin().z - center.z, 2))
- Math.pow(radius, 2);
double discriminant = Math.pow(Bq, 2) - (4 * Aq * Cq);
// Hay intersección, si se cumple esta condición... solo se ne
// necesita el primer valor que es el de la primera intersección
if (discriminant >= 0) {
discriminant = Math.sqrt(discriminant);
double firstT = (-Bq - discriminant) / (2 * Aq);
if (firstT > range.minT && firstT < range.maxT) {
h.setColor(this.color);
range.maxT = firstT;
h.setT(firstT);
// se debe retornar T
}
retVal = true;
}
return retVal;
// Compute the intersection of the ray with the
// Sphere and update what needs to be updated
// Valid values for t must be within the "range"
// ...
}
public void interactionForce(Particle other) {
// ok, now for the fun stuff...
Vector3d posDif = new Vector3d();
posDif.sub(x, other.x);
Vector3d velDif = new Vector3d();
velDif.sub(v, other.v);
double d = posDif.length();
double dSquared = d * d;
int m = 6;
int n = 5;
double r0 = 2 * PARTICLE_RADIUS;
double cr = r0;
double cd = r0;
double b1 = 1;
double b2 = b1; // *Math.pow(r0, n-m);
double sumR = 2 * PARTICLE_RADIUS;
double sr = 250;
double sd = 70;
/*sr = dSquared/(cr*cr*(sumR)*(sumR));
sd = dSquared/(cd*cd*(sumR)*(sumR));
sr = Math.max(0, 1 - sr);
sd = Math.max(0, 1 - sd);*/
Vector3d f = new Vector3d();
f.set(posDif);
f.normalize();
double sf =
-sr * (b1 / Math.pow(d / r0, m) - b2 / Math.pow(d / r0, n))
+ sd * (velDif.dot(f) / (d / r0));
f.scale(sf);
other.f.add(f);
}
public void power(double exp)
/* Transforms all the scalar values in 'this' by the rule:
* f' = f^exp */
{
for (int k = 0; k < size; ++k) f[k] = (float) Math.pow(f[k], exp);
}