public bool Hit(Ray ray, out HitRecord hitRecord)
{
hitRecord.m_t = -1;
hitRecord.m_point = Vector3.zero;
hitRecord.m_normal = Vector3.zero;
bool hit = false;
float closest = float.MaxValue;
foreach (var iter in m_sphereList)
{
//float enter = 0;
HitRecord hitRecordTmp = new HitRecord();
if (iter.Raycast(ray, 0, closest, out hitRecordTmp))
{
//if (hitRecordTmp.m_t < closest)
{
hit = true;
closest = hitRecordTmp.m_t;
hitRecord = hitRecordTmp;
}
}
}
return(hit);
}
public bool Raycast(Ray ray, float t_min, float t_max, out HitRecord hitRecord)
{
/*Vector3 oc = ray.origin - _center;
* float a = Vector3.Dot(ray.direction, ray.direction);
* float b = 2.0f * Vector3.Dot(oc, ray.direction);
* float c = Vector3.Dot(oc, oc) - _radius * _radius;
* float discriminant = b * b - 4 * a * c;
* if(discriminant > 0)
* {
* float root1 = (-b + Mathf.Sqrt(discriminant)) / (2 * a);
* float root2 = (-b - Mathf.Sqrt(discriminant)) / (2 * a);
* if(root1 > 0 && root2 > 0)
* {
* enter = Mathf.Min(root1, root2);
* return true;
* }
* else if(root1 > 0)
* {
* enter = root1;
* return true;
* }
* else if(root2 > 0)
* {
* enter = root2;
* return true;
* }
* else
* {
* enter = -1;
* return false;
* }
* }
* else
* {
* enter = -1;
* return false;
* }*/
hitRecord.m_t = -1;
hitRecord.m_point = Vector3.zero;
hitRecord.m_normal = Vector3.zero;
Vector3 oc = ray.origin - _center;
float a = Vector3.Dot(ray.direction, ray.direction);
float b = Vector3.Dot(oc, ray.direction);
float c = Vector3.Dot(oc, oc) - _radius * _radius;
float discriminant = b * b - a * c;
if (discriminant > 0)
{
float temp = (-b - Mathf.Sqrt(b * b - a * c)) / a;
if (temp < t_max && temp > t_min)
{
hitRecord.m_t = temp;
hitRecord.m_point = ray.GetPoint(temp);
hitRecord.m_normal = (hitRecord.m_point - _center) / _radius;
return(true);
}
temp = (-b + Mathf.Sqrt(b * b - a * c)) / a;
if (temp < t_max && temp > t_min)
{
hitRecord.m_t = temp;
hitRecord.m_point = ray.GetPoint(temp);
hitRecord.m_normal = (hitRecord.m_point - _center) / _radius;
return(true);
}
}
return(false);
}