/// <summary>
/// Calculate the cross (vector) product of two vectors
/// </summary>
/// <param name="left">First operand</param>
/// <param name="right">Second operand</param>
/// <returns>The cross product of the two inputs</returns>
public static Vector3Float Cross(this Vector3Float left, Vector3Float right)
{
Vector3Float result;
left.Cross(ref right, out result);
return(result);
}
public override (double u, double v) GetUv(IntersectInfo info)
{
Vector3Float normal = Plane.Normal;
Vector3Float vecU = new Vector3Float(normal.Y, normal.Z, -normal.X);
Vector3Float vecV = vecU.Cross(Plane.Normal);
var u = new Vector3Float(info.HitPosition).Dot(vecU);
var v = new Vector3Float(info.HitPosition).Dot(vecV);
return(u, v);
}
public override (double u, double v) GetUv(IntersectInfo info)
{
Vector3Float normal = Plane.Normal;
Vector3Float vecU = new Vector3Float(normal.y, normal.z, -normal.x);
Vector3Float vecV = Vector3Float.Cross(vecU, Plane.Normal);
var u = Vector3Float.Dot(new Vector3Float(info.HitPosition), vecU);
var v = Vector3Float.Dot(new Vector3Float(info.HitPosition), vecV);
return(u, v);
}
public override double GetSurfaceArea()
{
Vector3 accumulation = Vector3.Zero;
for (int firstIndex = 0; firstIndex < 3; ++firstIndex)
{
int secondIndex = (firstIndex + 1) % 3;
accumulation += new Vector3(Vector3Float.Cross(vertices[firstIndex], vertices[secondIndex]));
}
accumulation /= 2;
return(accumulation.Length);
}
/// <summary>
/// Transforms a vector by a quaternion rotation.
/// </summary>
/// <param name="vec">The vector to transform.</param>
/// <param name="quat">The quaternion to rotate the vector by.</param>
/// <param name="result">The result of the operation.</param>
public static void Transform(this Vector3Float vec, ref Quaternion quat, out Vector3Float result)
{
#if true
throw new NotImplementedException();
#else
// Since vec.W == 0, we can optimize quat * vec * quat^-1 as follows:
// vec + 2.0 * cross(quat.xyz, cross(quat.xyz, vec) + quat.w * vec)
Vector3Float xyz = quat.Xyz, temp, temp2;
Vector3Float.Cross(ref xyz, ref vec, out temp);
Vector3Float.Multiply(ref vec, quat.W, out temp2);
Vector3Float.Add(ref temp, ref temp2, out temp);
Vector3Float.Cross(ref xyz, ref temp, out temp);
Vector3Float.Multiply(ref temp, 2, out temp);
Vector3Float.Add(ref vec, ref temp, out result);
#endif
}
public override RGBA_Floats GetColor(IntersectInfo info)
{
if (Material.HasTexture)
{
Vector3Float Position = plane.planeNormal;
Vector3Float vecU = new Vector3Float(Position.y, Position.z, -Position.x);
Vector3Float vecV = Vector3Float.Cross(vecU, plane.planeNormal);
double u = Vector3Float.Dot(new Vector3Float(info.hitPosition), vecU);
double v = Vector3Float.Dot(new Vector3Float(info.hitPosition), vecV);
return(Material.GetColor(u, v));
}
else
{
return(Material.GetColor(0, 0));
}
}
public ColorF GetColor(IntersectInfo info)
{
if (Material.HasTexture)
{
Vector3Float normalF = new Vector3Float(Vector3.TransformNormal(face.Normal, worldMatrix));
Vector3Float vecU = new Vector3Float(normalF.y, normalF.z, -normalF.x);
Vector3Float vecV = Vector3Float.Cross(vecU, normalF);
double u = Vector3Float.Dot(new Vector3Float(info.HitPosition), vecU);
double v = Vector3Float.Dot(new Vector3Float(info.HitPosition), vecV);
return(Material.GetColor(u, v));
}
else
{
return(Material.GetColor(0, 0));
}
}
public PlaneFloat(Vector3Float point0, Vector3Float point1, Vector3Float point2)
{
this.Normal = Vector3Float.Cross((point1 - point0), (point2 - point0)).GetNormal();
this.DistanceFromOrigin = Vector3Float.Dot(Normal, point0);
}