# intersection

问题 I found out how to draw Rectangles and some code to find when two rectangles overlap but I can't connect these procedures. I have the two rectangles that I wanted but then a cannot determine whether these intersect, to then add this information to a ListBox. Here is my code: public partial class Form1 : Form { Graphics g; Pen p; Point cursor; int k = 0; Point[] tocke = new Point[2]; public Form1() { InitializeComponent(); g = this.CreateGraphics(); p = new Pen(Color.Black, 3); } private void

## Why is my Monte Carlo Raytracing so noisy?

问题 I have implemented global illumination using the Monte Carlo method, using the scratch a pixel tutorial as a guide. My final image renders very noisy! The example below is at 64 samples, I have previously used as high as 512 and its still very noisy. Any ideas what the problem could be? Edit: Here is the output with 128 samples and 16x Super sampling,resulting in 2048 samples. Still lots of noise! 回答1: Path tracing is pretty noisy; it's the nature of the algorithm. Consider this example from

## Why is my Monte Carlo Raytracing so noisy?

## SwiftUI: How can I detect if two views are intersecting each other?

问题 One view is intersecting the other one. How could we detect this intersection in SwiftUI? In Swift I would reach this with a few lines of code: import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() let a = UIView(frame: CGRect(x: 100, y: 100, width: 150, height: 150)) a.backgroundColor = .purple view.addSubview(a) let b = UIView(frame: CGRect(x: 150, y: 150, width: 150, height: 150)) b.backgroundColor = .orange view.addSubview(b) if a.frame

## Intersection of files

问题 I two large files (27k lines and 450k lines). They look sort of like: File1: 1 2 A 5 3 2 B 7 6 3 C 8 ... File2: 4 2 C 5 7 2 B 7 6 8 B 8 7 7 F 9 ... I want the lines from both files in which the 3rd column is in both files (note lines with A and F were excluded): OUTPUT: 3 2 B 7 6 3 C 8 4 2 C 5 7 2 B 7 6 8 B 8 whats the best way? 回答1: awk '{print $3}' file1 | sort | uniq > file1col3 awk '{print $3}' file2 | sort | uniq > file2col3 grep -Fx -f file1col3 file2col3 | awk '{print "\\w+ \\w+ " $1 "

## Intersection of files

## Boost geometry intersection does not output correctly

问题 From the following code I calculate the intersection of two polygons. I hope the output can be NULL if it is not polygon. However the output is (((240, 52.9999), (240, 53), (240, 53), (240, 52.9999))). This is not a polygon. Is there any way to check whether the output is really a polygon?? #include <iostream> #include <deque> #include <vector> #include <boost/geometry.hpp> #include <boost/geometry/geometries/point_xy.hpp> #include <boost/geometry/geometries/polygon.hpp> #include <boost

## Finding the point of intersection of 3 Numpy Arrays Python

问题 I am trying to code a function where it gives me the indexes of where either list_2 or list_3 crosses list_ . So it would give me the points of intersection if there are any in numpy code. I want to get the crosses in order, so the list of indexes have to be formatted so that it would give me a cross in order of list_2 cross, list_3 cross , list_2 cross or list_3 cross, list_2 cross , list_3 cross etc. So if a cross has happened it has to wait for the other array values to cross the list