bool Mesh::getIntersection(const Ray & ray, float & t, Vec3<float> & normal) const{
Plane plane;
Vec3<float> normalOutput, vertices4;
bool colision=false;
float pointIntersection;
t=inf;
for(size_t i = 0; i < poligons.size(); i++) {
plane.setPlane(poligons[i].vertices1,poligons[i].vertices2,poligons[i].vertices3);
if(plane.getIntersection(ray,pointIntersection,normal)) {
vertices4 = ray.eval(pointIntersection);
if(getIntersectionTriangle(poligons[i].vertices1, poligons[i].vertices2, poligons[i].vertices3, vertices4) && pointIntersection < t) {
t=pointIntersection;
normalOutput=normal;
colision=true;
}
}
}
if(colision) {
normal = normalOutput;
return true;
}
return false;
}
bool Box::intersect(const Ray & ray, Intersection & it)
{
Vector3f normal0, normal1, normalVec;
float t0 = 0, t1 = FLT_MAX;
float _t0, _t1;
for (int i = 0; i < 3; ++i) {
if (slabs[i].normal.dot(ray.D)) {
float NdotQ = slabs[i].normal.dot(ray.Q);
float NdotD = slabs[i].normal.dot(ray.D);
_t0 = -(slabs[i].d0 + NdotQ) / NdotD;
_t1 = -(slabs[i].d1 + NdotQ) / NdotD;
if (_t0 > _t1) {
float temp = _t0;
_t0 = _t1;
_t1 = temp;
}
normalVec = slabs[i].normal;
} else {
float NdotQ = slabs[i].normal.dot(ray.Q);
float s0 = NdotQ + slabs[i].d0;
float s1 = NdotQ + slabs[i].d1;
if (s0 * s1 < 0.0f) {
_t0 = 0.0f;
_t1 = FLT_MAX;
} else return false;
}
if (t0 < _t0) {
t0 = _t0;
normal0 = normalVec;
}
if (t1 > _t1) {
t1 = _t1;
normal1 = normalVec;
}
}
if (t0 > t1) return false;
else if (t0 > epsilon) {
it.t = t0;
it.normal = normal0;
}
else if (t1 > epsilon) {
it.t = t1;
it.normal = normal1;
}
else return false;
it.pos = ray.eval(it.t);
it.normal.normalize();
Vector3f cornerToIt = it.pos - corner;
if (cornerToIt[0] < epsilon || cornerToIt[1] < epsilon || cornerToIt[2] < epsilon) {
if (it.normal.dot(diag) > 0.0f) it.normal *= -1;
} else if (it.normal.dot(diag) < 0.0f) it.normal *= -1;
it.pS = this;
return true;
}
bool Sphere::intersect(const Ray & ray, Intersection & it)
{
Vector3f Qbar = ray.Q - center;
float QdotD = Qbar.dot(ray.D);
float fvar = sqrt(QdotD*QdotD - Qbar.dot(Qbar) + radius*radius);
if (-QdotD - fvar > epsilon) it.t = -QdotD - fvar;
else if (-QdotD + fvar > epsilon) it.t = -QdotD + fvar;
else return false;
it.pos = ray.eval(it.t);
it.normal = (it.pos - center).normalized();
it.pS = this;
return true;
}
/**
* Calculates whether a ray intersects with a sphere. Returns true or false,
* storing the collision point in result if true.
*/
bool Sphere::intersection(Ray prim_ray, Vec3 &result) {
double t0, t1;
Vec3 obj_center(pos);
Vec3 L = (*prim_ray.p1) - obj_center;
double a = prim_ray.p2->dot(*prim_ray.p2);
double b = 2 * prim_ray.p2->dot(L);
double c = L.dot(L) - (radius * radius);
if(!solve_quadratic(a, b, c, t0, t1)) {
return false;
} else {
prim_ray.eval(t0, result);
return true;
}
}
bool Triangle::intersect(const Ray & ray, Intersection & it)
{
Vector3f e1 = v1 - v0;
Vector3f e2 = v2 - v0;
Vector3f p = ray.D.cross(e2);
float d = p.dot(e1);
if (abs(d) < epsilon) return false;
Vector3f s = ray.Q - v0;
float u = (p.dot(s)) / d;
if (u < 0.0f || u >1) return false;
Vector3f q = s.cross(e1);
float v = ray.D.dot(q) / d;
if (v < 0.0f || u + v > 1.0f) return false;
float t = e2.dot(q) / d;
if (t < 0.0f)return false;
it.t = t;
it.pos = ray.eval(t);
it.normal = e1.cross(e2);
it.normal.normalize();
it.pS = this;
return true;
}
bool Cylinder::intersect(const Ray & ray, Intersection & it)
{
Vector3f Q = q._transformVector(ray.Q - base);
Vector3f D = q._transformVector(ray.D);
float t0 = 0, t1 = FLT_MAX;
double b0, b1;
Vector3f normalVec;
if (slab.normal.dot(D)) {
double NdotQ = slab.normal.dot(Q);
double NdotD = slab.normal.dot(D);
b0 = -(slab.d0 + NdotQ) / NdotD;
b1 = -(slab.d1 + NdotQ) / NdotD;
if (b0 > b1) {
double temp = b0;
b0 = b1;
b1 = temp;
}
} else {
float NdotQ = slab.normal.dot(Q);
float s0 = NdotQ + slab.d0;
float s1 = NdotQ + slab.d1;
if (s0 * s1 < 0.0f) {
b0 = 0.0f;
b1 = FLT_MAX;
} else return false;
}
double a = D[0] * D[0] + D[1] * D[1];
double b = 2 * (D[0] * Q[0] + D[1] * Q[1]);
double c = Q[0] * Q[0] + Q[1] * Q[1] - radius * radius;
double deter = b * b - 4.0f * a * c;
if (deter < 0) return false;
double c0 = (-b - sqrt(deter)) / 2.0f / a;
double c1 = (-b + sqrt(deter)) / 2.0f / a;
Vector3f normal0, normal1, M;
if (b0 > c0) {
t0 = b0;
if (D[2] > epsilon) normal0 = Vector3f(0.0f, 0.0f, -1.0f);
else normal0 = Vector3f(0.0f, 0.0f, 1.0f);
} else {
t0 = c0;
M = Q + t0*D;
normal0 = Vector3f(M[0], M[1], 0.0f);
}
if (b1 < c1) {
t1 = b1;
if (D[2] > epsilon) normal1 = Vector3f(0.0f, 0.0f, 1.0f);
else normal1 = Vector3f(0.0f, 0.0f, -1.0f);
} else {
t1 = c1;
M = Q + t1*D;
normal1 = Vector3f(M[0], M[1], 0.0f);
}
if (t0 > t1) return false;
else if (t0 > epsilon) {
it.t = t0;
it.normal = q.conjugate()._transformVector(normal0);
} else if (t1 > epsilon) {
it.t = t1;
it.normal = q.conjugate()._transformVector(normal1);
} else return false;
it.pos = ray.eval(it.t);
it.pS = this;
it.normal.normalize();
return true;
}
bool Cube::getIntersection(const Ray & ray, float & t, Vec3<float> & normal) const {
Plane add1(Vec3<float>(min.x, min.y, min.z), Vec3<float>(max.x, min.y, min.z), Vec3<float>(max.x, min.y, max.z));
Plane dd1c1(Vec3<float>(max.x, min.y, min.z), Vec3<float>(max.x, min.y, max.z), Vec3<float>(max.x, max.y, max.z));
Plane adc(Vec3<float>(min.x, min.y, min.z), Vec3<float>(max.x, min.y, min.z), Vec3<float>(max.x, max.y, min.z));
Plane abb1(Vec3<float>(min.x, min.y, min.z), Vec3<float>(min.x, max.y, min.z), Vec3<float>(min.x, max.y, max.z));
Plane bcc1(Vec3<float>(min.x, max.y, min.z), Vec3<float>(max.x, max.y, min.z), Vec3<float>(max.x, max.y, max.z));
Plane a1b1c1(Vec3<float>(min.x, min.y, max.z), Vec3<float>(min.x, max.y, max.z), Vec3<float>(max.x, max.y, max.z));
Vec3<float> pointIntersection, minValue, maxValue, normal1, normalP;
float t1, tP;
t1 = inf;
if(add1.getIntersection(ray, tP, normalP)) {
pointIntersection = ray.eval(tP);
minValue.x = min.x;
minValue.y = min.y;
minValue.z = min.z;
maxValue.x = max.x;
maxValue.y = min.y;
maxValue.z = max.z;
if ((pointIntersection >= minValue) && (pointIntersection <= maxValue)) {
if(tP < t1) {
t1 = tP;
normal1 = normalP;
}
}
}
if(dd1c1.getIntersection(ray, tP, normalP)) {
pointIntersection = ray.eval(tP);
minValue.x = max.x;
minValue.y = min.y;
minValue.z = min.z;
maxValue.x = max.x;
maxValue.y = max.y;
maxValue.z = max.z;
if (pointIntersection >= minValue && pointIntersection <= maxValue) {
if(tP < t1) {
t1 = tP;
normal1 = normalP;
}
}
}
if(adc.getIntersection(ray, tP, normalP)) {
pointIntersection = ray.eval(tP);
minValue.x = min.x;
minValue.y = min.y;
minValue.z = min.z;
maxValue.x = max.x;
maxValue.y = max.y;
maxValue.z = min.z;
if (pointIntersection >= minValue && pointIntersection <= maxValue) {
if(tP < t1) {
t1 = tP;
normal1 = normalP;
}
}
}
if(abb1.getIntersection(ray, tP, normalP)) {
pointIntersection = ray.eval(tP);
minValue.x = min.x;
minValue.y = min.y;
minValue.z = min.z;
maxValue.x = min.x;
maxValue.y = max.y;
maxValue.z = max.z;
if (pointIntersection >= minValue && pointIntersection <= maxValue) {
if(tP < t1) {
t1 = t;
normal1 = normalP;
}
}
}
if(bcc1.getIntersection(ray, tP, normalP)) {
pointIntersection = ray.eval(tP);
minValue.x = min.x;
minValue.y = max.y;
minValue.z = min.z;
maxValue.x = max.x;
maxValue.y = max.y;
maxValue.z = max.z;
if (pointIntersection >= minValue && pointIntersection <= maxValue) {
if(tP < t1) {
t1 = tP;
normal1 = normalP;
}
}
}
if(a1b1c1.getIntersection(ray, tP, normalP)) {
pointIntersection = ray.eval(tP);
minValue.x = min.x;
minValue.y = min.y;
minValue.z = max.z;
maxValue.x = max.x;
maxValue.y = max.y;
maxValue.z = max.z;
if (pointIntersection >= minValue && pointIntersection <= maxValue) {
if(tP < t1) {
t1 = tP;
normal1 = normalP;
}
}
}
if(t1 == Math::inf) {
return false;
}
t = t1;
normal = normal1;
return true;
}
