COZY COZY WORLD

I am an ordinary Japanese salaryman in his 50's.
The posts are mostly about my attempts at programming which I have taken up recently to maintain logical thinking.
And a bit about my travels around the country.

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cedarcantab

Feb 261 min read

Studying Box2D-Lite in Javascript, Part 7.3: Raycast against Circle

/** * Ray-cast input data. The ray extends from p1 to p1 + maxFraction (p2 - p1). * @export * @constructor */ box2d.b2RayCastInput =...

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cedarcantab

Feb 261 min read

Studying Box2D-Lite in Javascript, Part 9.1: Raycast against Segment

// p = p1 + t d // v = v1 + s e // p1 + t d = v1 + s e // s e - t d = p1 - v1 rayCast(output, input, transform, childIndex) { //...

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cedarcantab

Feb 261 min read

Studying Box2D-Lite in Javascript, Part XX: Edge shape

class b2EdgeShape extends b2Shape { constructor() { this.m_type = b2Shape.e_edge; this.m_radius = b2_polygonRadius; /// These are the...

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cedarcantab

Feb 261 min read

Studying Box2D-Lite in Javascript, Part XX: Capsule Shape

/// A solid capsule typedef struct s2Capsule { s2Vec2 point1, point2; float radius; s2MakeCapsule(s2Vec2 p1, s2Vec2 p2, float radius) {...

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cedarcantab

Feb 261 min read

Studying Box2D-Lite in Javascript, Part 10.3: Testing Polygon Convexity

/// This determines if a hull is valid. Checks for: /// - convexity /// - collinear points /// This is expensive and should not be called...

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cedarcantab

Feb 264 min read

Studying Box2D-Lite in Javascript, Part 10.2: Creating Convex Hull - Quick Hull

The Quickhull algorithm for computing the convex hull in two dimensions may be summarized as follows: Initialization: Start with the...

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cedarcantab

Feb 262 min read

Studying Box2D-Lite in Javascript, Part 8: Collision Detection - Polygon vs Circle

Polygon vs Circle function b2CollidePolygonAndCircle(manifold, polygonA, xfA, circleB, xfB) { manifold.pointCount = 0; // Compute...

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cedarcantab

Feb 265 min read

Studying Box2D-Lite in Javascript, Part 9: Contact Solver

Remember, the contact manager takes care of coming up with the contact information as a b2Contact object (or null if there is no...

2 views0 comments

cedarcantab

Feb 251 min read

Studying Box2D-Lite in Javascript, Part 7.1: Collision Detection - Circle vs Circle

Detecting Collision and identifying the contact point function b2CollideCircles( manifold, circleA, xfA, circleB, xfB) { ...

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cedarcantab

Feb 252 min read

Studying Box2D-Lite in Javascript, Part 6: Contact Manager

We looked at the code to: detect collision, generate contact information. As mentioned earlier, unlike Lite, Box2D handles not just boxes...

7 views0 comments

cedarcantab

Feb 121 min read

Studying Box2D-Lite in Javascript, Part 5.4: Submerged Area of Circle

box2d.b2CircleShape.prototype.ComputeSubmergedArea = function(normal, offset, xf, c) { /** @type {box2d.b2Vec2} */ var p =...

7 views0 comments

cedarcantab

Feb 122 min read

Studying Box2D-Lite in Javascript, Part 10.4: Submerged area of polygon

/** * @export * @return {number} * @param {box2d.b2Vec2} normal * @param {number} offset * @param {box2d.b2Transform} xf * @param...

2 views0 comments

cedarcantab

Feb 123 min read

Douglas Peuker Algorithm

## Bing Certainly! The Ramer–Douglas–Peucker algorithm, also known as the Douglas–Peucker algorithm, is a method for simplifying a curve...

3 views0 comments

cedarcantab

Feb 121 min read

Particles and Rigid Body / Marching Squares & DPS

buildLand:function(){ this.xs=1; this.ys=0; this.mypoly.removeAll(true); points.x=[]; points.y=[]; superData=this.land.context.getImageDa...

5 views0 comments

cedarcantab

Feb 122 min read

Marching Cube

Grid Class class GRIDCELL { constructor(f, origin, scale) { this.pos = new Vector3(); // "position" of the cube this.f = f; this.origin =...

1 view0 comments

cedarcantab

Feb 128 min read

Delaunay Triangulation

https://github.com/darkskyapp/delaunay-fast?tab=readme-ov-file var Delaunay; (function() { "use strict"; var EPSILON = 1.0 / 1048576.0;...

2 views0 comments

cedarcantab

Feb 111 min read

Rigid Body with Particles like Noita [WIP]

https://youtu.be/prXuyMCgbTc PieKing1215/FallingSandSurvival: 2D survival game inspired by Noita and slightly Terraria (github.com)...

1 view0 comments

cedarcantab

Feb 73 min read

Studying Box2D-Lite in Javascript, Part 10.1: Creating Convex Hull - Gift Wrapping

There are many different convex hull algorithms. I looked at several, including Jarvis March, Graham Scan and QuickHull. Simplest is...

10 views0 comments

cedarcantab

Feb 73 min read

Collision Filtering

b2Filter https://box2d.org/documentation/structb2_filter.html b2FilterData.b2FilterData = function () { this.categoryBits = 0x0001;...

6 views0 comments

cedarcantab

Feb 66 min read

QuadTree [WIP]

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