Purescript simple scene model and geometric operations. Simple ThreeJS bindings included.

This is a personal exploratoty project to learn more Purescript and WebGL.

See it live at Purescript ThreeJS

Getting started

1. Install all dependencies:

   npm install -g purescript pulp psc-package-bin-simple
   npm install
   psc-package install

2. Start the project (will start build and server background processes):

   npm start

3. Enter http://127.0.0.1:8080/ and watch it go!

Project hierarchy

• Editor
  • Placeholder for a project editor in browser
• Projects
  • Graph-like scene creator & animations
• Three
  • ThreeJS bindings and utilities
• Lib
  • An algebra for 3D objects
• Main
  • Entry point

Creating a new scene

• Create a new Projects folder with the project name
• Duplicate Main.purs of another project, set scene, camera, etc.
• Create a new Project file, import it in main
• Project should export create (Effect Project) and update functions (Effect Unit)
• create a new link in index.html
  <a href="#/04" onclick="go()" class="page">04</a>
• create a new route in index.js

TODO

• Use import Control.Monad.Eff.Uncurried instead of custom js-ffi
• Make udpdate functions in projects NOT perform side effects but get a collection of objects and properties and
  return a new collection of objects and properties. A consumer will use that to apply the changes
  under Eff making the scene as pure as possible. Under that idea, the project would use a DSL and a “runner” module
  would transform those into actual threejs calls.
• Make Project a graph and provide a way to traverse it (Functor Project?)
• Generalize the project file utils into a project object in Pure3
• Connect datGUI to those params to get some interactivity
• Create a set of JS utils to make IFF less painful
  • Get webpack to serve all files using purs-loader or similar
    • Will this do dead code elimination?
• Orbitcontrol rotate, autoupdate fns, enable zoom, etc.
• Write a bit of documentation about the type decisions on Timeline and Main mostly
• Pass any input value as well as frame to behaviours…
• Move camera into project?
• Add proper fog to scene instead of directly from js
• Transparent canvas color?
• Check for a way to easy the pain on wrapping unwrapping object3D
• get 2d coordinates from any element in canvas to match css elements on top
• Move projects config to a record
• move onResize event to purescript
• throttle onResize
• Replace Maintype with Effect, currently Timeline is coupled
• [NEWTYPE] Wrap / Unwrap using newtype instance for Line and other Pure3 types
• Flip shape matrix to the ground
• Center FrameBound scene
• custom height for buildings
• get shadows to work
• create a base material object (typeclass? to deal with common properties)
• only get lines with all points inside query from osm-cutemaps
• makes some sense of the lineString geom type
• explore solutions like https://www.nextzen.org/ or https://wiki.openstreetmap.org/wiki/Overpass_API to get the data
• Finish ThreeJS bindings module structure, set placeholders for every module in the original repo
• Check lineGeometry, lineMaterial, etc.

From stackoverflow:

function hexToRgb(hex) {
    var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
    return result ? {
        r: parseInt(result[1], 16) / 255,
        g: parseInt(result[2], 16) / 255,
        b: parseInt(result[3], 16) / 255
    } : null;
}