public Bounds3(Vector3f p1, Vector3f p2, Vector3f p3)
{
pMin = Vector3f.Min(Vector3f.Min(p1, p2), p3);
pMax = Vector3f.Max(Vector3f.Max(p1, p2), p3);
ExpandMargin();
}
public static uint CompressColor(Vector3 color, float alpha = 1.0f, bool average = true)
{
float multiplier = average ? 128.0f : 255.0f;
color = Vector3.Max(new Vector3(), Vector3.Min(new Vector3(255.0f), color * multiplier + new Vector3(0.5f)));
return(((uint)color.X) | (((uint)color.Y) << 8) | (((uint)color.Z) << 16) | ((uint)(MathC.Clamp(alpha, 0, 1) * 255.0f) << 24));
}
/// <summary>
/// 并运算
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
/// <returns></returns>
public static Bounds3 Union(Bounds3 a, Vector3f b)
{
Bounds3 ret = new Bounds3();
ret.pMin = Vector3f.Min(a.pMin, b);
ret.pMax = Vector3f.Max(a.pMax, b);
return(ret);
}
/// <summary>
/// 判断光线与包围盒是否相交
/// </summary>
/// <param name="ray"></param>
/// <returns>是否相交，相交点到ray.d距离</returns>
public (bool, float) Intersection(Ray ray)
{
Vector3f tmins = (pMin - ray.Origin) * ray.Direction_Inv;
Vector3f tmaxs = (pMax - ray.Origin) * ray.Direction_Inv;
float tmin = Tools.MaxElement(Vector3f.Min(tmins, tmaxs));
float tmax = Tools.MinElement(Vector3f.Max(tmins, tmaxs));
return(tmin < tmax, tmin);
}
public static Vec3 Clamp(this Vec3 value, Vec3 min, Vec3 max)
{
return(Vec3.Max(min, Vec3.Min(max, value)));
}
