Simulating depth of field with particles on a shader
Inside libs/createScene.js
you can code the scene you want to render, only lines and quads are supported atm, here's an example on how to populate the lines
array:
function createScene(frame) { // frame is used to make animations, I'll update soon the readme to explain how that's done
// lines is a global array
lines.push({
// first vertex of the line
x1: x1,
y1: y1,
z1: z1,
// second vertex of the line
x2: x2,
y2: y2,
z2: z2,
// color of the first vertex, can take values bigger than 1.0
c1r: 1,
c1g: 0,
c1b: 0,
// color of the second vertex, can take values bigger than 1.0
c2r: 0,
c2g: 0,
c2b: 1,
// optional, if $useLengthSampling is set to true this variable will change the weight this lines has in the distribution of points for each line
weight: 1,
});
// quads is a global array
let quad = new Quad(0,0,0, /* <- starting position */ 0,0,1,1 /* texture uvs */)
.scale(0.5)
.color(100, 50, 10)
.translate(0, 1, 0)
.rotate(0, 0, 1, /* <- rotation axis */, 0.5 /* <- rotation angle */)
// quads is a global array
quads.push(quad);
}
Quads can make use of a single texture, specified in libs/globals.js
You can change various parameters of the renderer by modifying the values in libs/globals.js
// camera parameters
var cameraFocalDistance = 49.19;
var bokehStrength = 0.095;
var exposure = 0.0019;
// set to 1 to have non-linear increase in focal strength
var focalPowerFunction = 0;
// how big lines should be on screen when they're in the focal plane
var minimumLineSize = 0.015;
// how many render calls are made each frame
var drawCallsPerFrame = 5;
// texture used by quads when specifying uvs
var quadsTexturePath = "assets/textures/ExportedFont1.bmp";
// wether each line has assigned a quantity of points proportional to its length or a fixed number instead
var useLengthSampling = false;
// if $useLengthSampling is false, every line will by rendered by default with $pointsPerLine points, same for $pointsPerQuad
var pointsPerLine = 25;
var pointsPerQuad = 500;
// if $useLengthSampling is true, every line will be drawn with an amount of points that
// is proportional to the line's length, (or quad's area length for $quadPointsPerFrame)
// use $pointsPerFrame/$quadPointsPerFrame to determine how many points will be drawn in
// a single drawcall. Keep in mind that each line/quad is drawn with
// at least one point
var pointsPerFrame = 1000000;
var quadPointsPerFrame = 500000;
// wether to use a bokeh texture or not, keep an eye on render times
// since they will be a bit slower when using bokeh textures
var useBokehTexture = false;
var bokehTexturePath = "assets/bokeh/c1.png";
Alternatively, you can create a setGlobals
function inside libs/createScene.js
to modify any variable of libs/globals.js
In case setGlobals
is specified, it will be called before any other function
The threejs source attached in the repo was modified to always disable frustum culling (check libs/main.js
to see the exact changes)
The DOF displacement algorithm was taken from This blog post