koobas.hobune.stream
How to convert Python in to C#? Maths or find Shortest distance between two skew lines in 3D space.
I think it'll be enough if I understand what
np.linalg.norm(A)
np.linalg.det([t, _A, cross])
np.cross(_A, _B)
does
Python code founded here 6. answer by @Fnord
I was looking at their doc, but I couldn't understand a thing it's even worst than in MSDN doc
EDIT:
I deleted my code as my assumptions were totally incorrect.
even if my original Question wasn't answered my original problem was solved.
Problem:
how to find 2 closest points between two skew lines in 3D
this gr8 tutorial could've helped me IF I'd understood how to learn programmatically what t and s is.
Also I found this Q/A before but it doesn't work correctly.
This is definitely not a Unity question, you should try on some C# forum...
@suribe - actually his question is how to translate the vector math functions in the Phyton code into Unity vector math functions. This seems like a reasonable Unity question since it is primarily about Unity's vector class (and maybe their matrix classes).
ok someone helped me and solved my original problem:
//Two non-parallel lines which may or may not touch each other have a point on each line which are closest
//to each other. This function finds those two points. If the lines are not parallel, the function
//outputs true, otherwise false.
public static bool ClosestPointsOnTwoLines(out Vector3 closestPointLine1, out Vector3 closestPointLine2, Vector3 linePoint1, Vector3 lineVec1, Vector3 linePoint2, Vector3 lineVec2){
closestPointLine1 = Vector3.zero;
closestPointLine2 = Vector3.zero;
float a = Vector3.Dot(lineVec1, lineVec1);
float b = Vector3.Dot(lineVec1, lineVec2);
float e = Vector3.Dot(lineVec2, lineVec2);
float d = a*e - b*b;
//lines are not parallel
if(d != 0.0f){
Vector3 r = linePoint1 - linePoint2;
float c = Vector3.Dot(lineVec1, r);
float f = Vector3.Dot(lineVec2, r);
float s = (b*f - c*e) / d;
float t = (a*f - c*b) / d;
closestPointLine1 = linePoint1 + lineVec1 * s;
closestPointLine2 = linePoint2 + lineVec2 * t;
return true;
}
else{
return false;
}
}
posting this as it probably will help others.
To give credit where credit is due, this code appears to be pulled from the $$anonymous$$ath3d class in the Unity Wiki.
http://wiki.unity3d.com/index.php/3d_$$anonymous$$ath_functions
Interesting, ... didn't know it was there, ... +1
could be someone that helped me was getting data from there, ...
