npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

regl-insta-lines

v2.0.1

Published

## Highly extendable instanced line rendering in a single draw call. Based on [Regl](https://github.com/regl-project/regl).

Downloads

472

Readme

Instanced Lines for REGL

Highly extendable instanced line rendering in a single draw call.

Based on Regl.

Loosely based on Rye Terrell's Instanced Line Rendering, highly recommended as introduction.

Live demo

Installation

npm install --save regl-insta-lines
# or
yarn add regl-insta-lines

Features:

  • batch rendering of lines
  • vertex shader expanded
  • start / end caps (butt, square, round, arrow(size, angle))
  • joins (bevel, miter(limit), miterSquare, round)
  • closed loop support
  • GLSL injectable to tailor to your needs (e.g. do you have a non-linear camera?)
  • full type support

| filled | wireframe | |-|-| | | |

| UVs | Decoration using UV.y | |-|-| | | |

API

Example usage:

import createRegl from 'regl';
import { createLines, CapType, JoinType } from 'regl-insta-lines';

const regl = createRegl();

// create lines
const lines = createLines(regl, {
  // points can be specified using 2 or 3 floats, typescript will help you enforce this
  dimension: 2,
  width: 60,  // in pixels
  cap: CapType.square,
  join: JoinType.miter(2),  // specify limit here
  joinCount: 3,
  cameraTransform: glsl`
    // optional
    vec4 cameraTransform(vec4 pos) {
      return ... your cool non-linear camera
    }
  `,
  ... other props
});

// describe a batch of lines
lines.setLines([{
  // if dimension=2
  points: [[0, 0], [1, 0], [1, 1]],
  // if dimension=3
  points: [[0, 0, 0], [1, 0, 0], [1, 1, 0]],
  // each line in the batch can be closed or open
  closed: true
}, {
  ...
}]);


// render them
regl.frame(()=>{
  // set width each frame
  lines.setWidth(30 * Math.sin(ctx.time))  // in pixels
  // single draw call rendering
  lines.render();
})

Constructor:

| Property | Type | Default | Description | |----------|------|---------|-------------| | width | number | 1.0 | Width of lines in pixels. Can also be set using .setWidth(width) function after creation. | | cap | string (GLSL) or { start: GLSL; end: GLSL; } | CapType.butt | Any of CapTypes or your own custom GLSL function. Supported: butt, square, round | | join | string (GLSL) | JoinType.bevel | Any of JoinTypes or your own custom GLSL function. Supported: bevel, miter, round, miterSquare | | joinCount | int | 4 | Number of triangles approximating the joins. NOTE: joins (like miter or round) effectively become bevel joins when set to 1. | | distanceFn | (a: vec3, b: vec3) => number | vec3.distance | Function that calculates distance between two points. Used to determine distanceAlongPath varying for fragment shader (useful for dashes for example) | | frag | string (GLSL) | fill white | Optional fragment shader, gets the following varyings: vec3 vPos; vec2 vUv; vec3 distanceAlongPath;. NOTE: Even though it's optional here, if you don't specify it, you must wrap the render call inside a regl command that does provide it, otherwise regl will scream at you. | | reverseMiterLimit | number | 0.5 | How far up the segment can a reverse miter go. Anything more than 0.5 runs a risk of failure, but allows sharper angles to still be reverse mitered. | | cameraTransformGLSL | string (GLSL) | identity | Optional GLSL code for a function of the following definition: vec4 cameraTransform(vec4 pos); | | declarationsGLSL | string (GLSL) | identity | Optional GLSL declarations code. At least vec4 cameraTransform(vec4 pos);. Useful for custom attributes. | | defineVerticesGLSL | string (GLSL) | undefined | Optional GLSL code that defines vertices vec3 p0, p1, p2, p3;, or skips a segment by setting float skip; to something other than 0.0 | | postprocessVerticesGLSL | string (GLSL) | undefined | Optional GLSL code that modifies clip or screen-space coordinates. | | mainEndGLSL | string (GLSL) | undefined | Optional GLSL code that runs at the end of main body. | | primitive | regl's primitive type | triangles | Used for debug when rendering with lines for example |

Extending the base

The main function createLines is actually a wrapper around the base implementation createLineBase that provides convenience around batch rendering and distance calculation. If you would like to manage your own attribute buffers, you can use createLineBase function directly. In this case, you can use createLines as a reference implementation since describing how to use it here is a bit verbose, but the interface is very close to what is described in the API section.

Future Improvements

  • provide a few useful fragment shaders (e.g. dashes). Until then, check out the ones in Live demo.

Combination Test

Combination Test Filled

Combination Test

NOTE: "extra" lines are simply an artifact of rendering with 'line strip'. In reality each segment is represented as 4 triangles + 2 join accordions, one on each side. Even though each segment renders an accordion on both sides, only one is visible per join because the other one gets back-face culled.

Anatomy of a single segment

You can view this at Geogebra

Segment