Algorithms for collision detection between concave polygons
Dec 11, 2013 · Using this method, concave polygons are the same speed or even faster to test collision against than if they were broken down into convex polygons (worst case scenario is the same time if both have same amount of vertices, best case scenario can cut tests down to all lines from step 1 and one line from step 2, cutting out testing for any of the ...
geometry - Decomposition to Convex Polygons - Stack Overflow
Aug 18, 2015 · This question is a little involved. I wrote an algorithm for breaking up a simple polygon into convex subpolygons, but now I'm having trouble proving that it's not optimal (i.e. minimal number of convex polygons using Steiner points (added vertices)). My prof is adamant that it can't be done with a greedy algorithm such as this one, but I can't ...
math - Concave and Convex Polygon - Stack Overflow
Mar 31, 2020 · Use a convex hull algorithm (such as the Graham scan), and remove all points that are not part of the resulting convex hull. In your example, the convex hull will consist of P1, P2, P3, P5, P7, P8, P9, P11, P12, P13, P14, P15, P16, …
Open CV Contours - Splitting concave polygon into multiple …
Jul 13, 2020 · I then want to transform any concave polygons into multiple convex polygons. Like this. So far I've managed to isolate each block into contours with opencv... but is there an easy way to split the L shape objects into two or more square blocks. The new contours of each shape can overlap if needed.
Removing Concave Points to Form Convex Polygons - Stack …
Nov 13, 2010 · I would like to deconstruct the following polygon shown in blue removing all of the points from the polygon that cause concavity. Currently, what I have been attempting to do is: Take each point ...
concave polygon into convex polygons using r - Stack Overflow
Feb 19, 2020 · I am trying to split a concave polygon into convex polygons using r. I am trying to figure out how to successfully accomplish this for one polygon with the hopes of implementing this on a large number of polygons in an automated way.
Best way to merge overlapping convex polygons into a single …
Sep 6, 2019 · 1) The polygons that I need to merge together are always convex. 2) The vertices of each polygon are defined in clockwise order. 3) The polygons are never in any specific order. 4) The final polygon can only be simple convex or concave polygon, i.e. no self-intersection, no duplicate vertices or holes in the shape.
How do I efficiently determine if a polygon is convex, non-convex …
Jan 23, 2009 · For a non complex (intersecting) polygon to be convex, vector frames obtained from any two connected linearly independent lines a,b must be point-convex otherwise the polygon is concave. For example the lines a,b are convex to the point p and concave to it below for each case i.e. above: p exists inside a,b and below: p exists outside a,b
Split concave polygon in convex ones - Stack Overflow
Aug 9, 2015 · Is there any easy algorithm to split a concave polygon in convex ones or represent a polygon by triangles. I know there is a Wikipedia entry on triangulation but this doesn't really help me. I know there already is a question on Stackoverflow, however this …
Best way to triangulating complex irregular concave and convex …
Nov 2, 2017 · I need to triangulate a polygon that will have lots vertices close together. The polygons are going to represent the shape of countries. I am using libgdx and want to utilise its PolygonRegion class: PolygonRegion(TextureRegion region, float[] vertices, short[] triangles)