Navier Stoke Fluid Simulation
How do I make an navier stoke fluid simulation?
What is a navier stoke fluid simulation? How do you make a navier stoke fluid simulation? This script and codes were developed by Endre Simo on 28 November 2022, Monday.
Navier Stoke Fluid Simulation - Script Codes HTML Codes
<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>Navier Stoke Fluid Simulation</title> <link rel="stylesheet" href="css/style.css">
</head>
<body> <div class="wrapper"> <div class="context"></div>
</div>
<div id="gui"></div>
<script> function getIEVersion() { var rv = -1; // Return value assumes failure. if (navigator.appName == 'Microsoft Internet Explorer') { var ua = navigator.userAgent; var re = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})"); if (re.test(ua) != null) rv = parseFloat( RegExp.$1 ); } return rv; } function checkVersion() { var ver = getIEVersion(); if ( ver != -1 ) { if (ver <= 9.0) { document.body.innerHTML = ""; document.body.innerHTML = "<p class='no-canvas'>" + "You need a <a href='https://www.google.com/chrome'>modern browser</a> to view this experiment." + "</p>"; } } } checkVersion();
</script> <script src='https://cdnjs.cloudflare.com/ajax/libs/dat-gui/0.5/dat.gui.min.js'></script> <script src="js/index.js"></script>
</body>
</html>
Navier Stoke Fluid Simulation - Script Codes CSS Codes
@import url(https://fonts.googleapis.com/css?family=Roboto+Condensed:300);
@import url(https://fonts.googleapis.com/css?family=Lemon);
html, body { width: 100%; height: 100%; overflow: hidden; background: #111; margin: 0; padding: 0; -webkit-user-select: none; -moz-user-select: none; -khtml-user-select: none; user-select: none;
}
/*******************************
* Main display
********************************/
div#main { position:relative!important; display: block!important; width: 900px!important; height: 600px!important; width: 100%; margin: 0 auto; border: 1px solid #222; -webkit-border-radius: 2px; -moz-border-radius: 2px; -ms-border-radius: 2px; -o-border-radius: 2px; border-radius: 2px; -webkit-box-shadow: 0px 2px 17px rgba(0,0,0,.80), inset 0 0 15px 15px rgba(5,5,5,.2); -moz-box-shadow: 0px 2px 17px rgba(0,0,0,.80), inset 0 0 15px 15px rgba(5,5,5,.2); box-shadow: 0px 2px 17px rgba(0,0,0,.80), inset 0 0 15px 15px rgba(5,5,5,.2);
}
div.context { position:realtive; width: 820px; height: 520px; margin: 0 auto; border: 1px solid #222; -webkit-border-radius: 2px; -moz-border-radius: 2px; -ms-border-radius: 2px; -o-border-radius: 2px; border-radius: 2px; -webkit-box-shadow: 0px 2px 17px rgba(0,0,0,.80), inset 0 0 15px 15px rgba(5,5,5,.2); -moz-box-shadow: 0px 2px 17px rgba(0,0,0,.80), inset 0 0 15px 15px rgba(5,5,5,.2); box-shadow: 0px 2px 17px rgba(0,0,0,.80), inset 0 0 15px 15px rgba(5,5,5,.2);
}
div.wrapper { position: absolute; width: 100%; margin: 0; padding: 0; top: 60px;
}
.context #canvas { position: relative; width: 800px; height: 500px; left: 10px; top: 10px;
}
#gui { position: absolute; right: 100px; top :0;
}
.no-canvas { color: #999999; font-size: 24px; text-align: center; margin-top: 150px;
}
Navier Stoke Fluid Simulation - Script Codes JS Codes
/** * created by Simo Endre * @simo_endre */
var FS = FS || { REVISION : '01'};
FS.Solver = (function() { // Private variables var _NX, _NY, _NX2, _NY2, _invNumCells, _dt, _isRGB, _solverIterations, _colorDiffusion, _doVorticityConfinement; var wrap_x = false; var wrap_y = false; var _visc, _fadeSpeed, _avgDensity, _uniformity, _avgSpeed; var temp = 0; // Constants var FLUID_DEFAULT_NX = 50, FLUID_DEFAULT_NY = 50, FLUID_DEFAULT_DT = 0.1, FLUID_DEFAULT_VISC = 0.00012, FLUID_DEFAULT_COLOR_DIFUSION = 0.1, FLUID_DEFAULT_FADESPEED = 0.0014, FLUID_DEFAULT_SOLVER_ITERATION = 4, FLUID_DEFAULT_VORTICITY_CONFINEMENT = false; var self; function FSolver() { // Public variales this.width = 0; this.height = 0; this.numCells = 0; self = this; this.__defineGetter__('wrapX', function() { return wrap_x; }); this.__defineGetter__('wrapY', function() { return wrap_y; }); this.__defineGetter__('fadeSpeed', function() { return _fadeSpeed; }); this.__defineGetter__('solverIterations', function() { return _solverIterations; }); this.__defineSetter__('rgb', function(value) { _isRGB = value; }); this.__defineSetter__('fadeSpeed', function(value) { _fadeSpeed = value; }); this.__defineSetter__('solverIterations', function(value) { _solverIterations = value; }); this.__defineSetter__('viscosity', function(value) { _visc = value; }); this.__defineSetter__('deltaT', function(value) { _dt = value; }); this.__defineSetter__('vorticityConfinement', function(value) { _doVorticityConfinement = value; }); } FSolver.prototype.mainSolver = function(NX, NY) { setup(NX, NY); this.reset(); }; FSolver.prototype.reset = function() { if (typeof Float32Array == null || typeof Float32Array == "undefined") Float32Array = Array; this.r = new Float32Array(this.numCells); this.g = new Float32Array(this.numCells); this.b = new Float32Array(this.numCells); this.u = new Float32Array(this.numCells); this.v = new Float32Array(this.numCells); this.rOld = new Float32Array(this.numCells); this.gOld = new Float32Array(this.numCells); this.bOld = new Float32Array(this.numCells); this.uOld = new Float32Array(this.numCells); this.vOld = new Float32Array(this.numCells); this.curl_abs = new Float32Array(this.numCells); this.curl_orig = new Float32Array(this.numCells); this.density = new Float32Array(this.numCells); this.densityOld = new Float32Array(this.numCells); this.source = new Float32Array(this.numCells); temp = new Float32Array(this.numCells); var i = this.numCells; while(i-- > -1) { this.r[i] = this.rOld[i] = this.g[i] = this.gOld[i] = this.b[i] = this.bOld[i] = 0; this.u[i] = this.uOld[i] = this.v[i] = this.vOld[i] = 0; this.curl_abs[i] = this.curl_orig[i] = 0; this.density[i] = this.densityOld[i] = 0; this.source[i] = 0; } }; FSolver.prototype.updateDensity = function() { addDensitySource(this.density, this.densityOld); if (_doVorticityConfinement) { calcVorticityConfinement(this.uOld, this.vOld); } diffuse(0, this.densityOld, this.density, 0); advect(0, this.density, this.densityOld, this.u, this.v); } FSolver.prototype.updateVelocity = function() { this.addCellVelocity(); this.SWAP('uOld', 'u'); diffuse(1, this.u, this.uOld, _visc); this.SWAP('vOld', 'v'); diffuse(2, this.v, this.vOld, _visc); project(this.u, this.v, this.uOld, this.vOld); this.SWAP('uOld', 'u'); this.SWAP('vOld', 'v'); advect(1, this.u, this.uOld, this.uOld, this.vOld); advect(2, this.v, this.vOld, this.uOld, this.vOld); project(this.u, this.v, this.uOld, this.vOld); } FSolver.prototype.getIndexForCellPosition = function(i, j) { i = (i < 1) ? 1 : ((i > _NX) ? _NX : i); j = (j < 1) ? 1 : ((j > _NY) ? _NY : i); return FLUID_IX(i, j); }; FSolver.prototype.getIndexForNormalizedPosition = function(x, y) { return this.getIndexForCellPosition(parseInt(x * _NX2), parseInt(y * _NY2)); }; FSolver.prototype.setWrap = function(x, y) { x = x || false; y = y || false; wrap_x = x; wrap_y = y; }; FSolver.prototype.SWAP = function(x0, x) { var tmp = this[x0]; this[x0] = this[x]; this[x] = tmp; } FSolver.prototype.addCellVelocity = function() { var size = self.numCells; while(size-- > -1) { if (isNaN(self.u[size])) continue; self.u[size] += _dt * self.uOld[size]; if (isNaN(self.v[size])) continue; self.v[size] += _dt * self.vOld[size]; } } FSolver.prototype.getDensity = function(x, y) { return this.density[(x + 1) + (y + 1) * _NY]; }; // Private functions function setup(NX, NY) { _dt = FLUID_DEFAULT_DT; _visc = FLUID_DEFAULT_VISC; _fadeSpeed = FLUID_DEFAULT_FADESPEED; _solverIterations = this.solverIterations; _colorDiffusion = FLUID_DEFAULT_COLOR_DIFUSION; _doVorticityConfinement = FLUID_DEFAULT_VORTICITY_CONFINEMENT; _NX = NX; _NY = NY; _NX2 = _NX + 2; // cells + extra boundary cells _NY2 = _NY + 2; self.numCells = _NX2 * _NY2; _invNumCells = 1.0 / self.numCells; self.width = _NX2; self.height = _NY2; _isRGB = false; } function addDensitySource(x, x0) { var size = self.numCells; while(size-- > -1) { x[size] += _dt * x0[size]; } } function addSourceRGB() { var size = self.numCells; while(size-- > -1) { if (isNaN(self.r[size])) continue; self.r[size] += _dt * self.rOld[size]; if (isNaN(self.g[size])) continue; self.g[size] += _dt * self.gOld[size]; if (isNaN(self.b[size])) continue; self.b[size] += _dt * self.bOld[size]; } } function diffuse(bound, c, c0, _diff) { var a = _dt * _diff * _NX * _NY; linearSolver(bound, c, c0, a, 1.0 + 4 * a); } function diffuseUV(bound, _diff) { var a = _dt * _diff * _NX * _NY; linearSolverUV(bound, a, 1.0 + 4 * a); } function diffuseRGB(_diff) { var a = _dt * _diff * _NX * _NY; linearSolverRGB( a, 1.0 + 4 * a); } function calcVorticityConfinement(x, y) { var i, j, index, dx, dy, av, length; for (j = _NY; j > 0; --j) { index = FLUID_IX(_NX, j); for (i = _NX; i > 0; --i) { dx = self.u[parseInt(index + _NX2)] - self.u[parseInt(index - _NX2)]; dy = self.v[parseInt(index + 1)] - self.v[parseInt(index - 1)]; av = (dy - dx) * 0.5; self.curl_orig[parseInt(index)] = av; self.curl_abs[parseInt(index)] = (av < 0) ? -av : av; --index; } } for (j = _NY-1; j > 1; --j) { index = FLUID_IX(_NX-1, j); for (i = _NX-1; i > 1; --i) { dx = self.curl_abs[parseInt(index + 1)] - self.curl_abs[parseInt(index - 1)]; dy = self.curl_abs[parseInt(index + _NX2)] - self.curl_abs[parseInt(index - _NX2)]; length = Math.sqrt(dy * dy + dx * dx) + 0.0001; length = 2 / length; dx *= length; dy *= length; av = self.curl_orig[parseInt(index)]; y[parseInt(index)] = dx * av; x[parseInt(index)] = dy * -av; --index; } } } function fadeR() { var holdAmount = 1 - _fadeSpeed; var totalDeviations = 0; var currentDeviation = 0; var i; _avgDensity = 0; _avgSpeed = 0; for (i = 0; i < self.numCells; i++) { self.uOld[i] = 0; self.vOld[i] = 0; self.rOld[i] = 0; _avgSpeed = self.u[i] * self.u[i] + self.v[i] * self.v[i]; var density = Math.min(1.0, self.r[i]); _avgDensity += density; // calc deviation for uniformity currentDeviation = density - _avgDensity; totalDeviations += currentDeviation * currentDeviation; // fade out old self.r[i] = density * holdAmount; } _avgDensity *= _invNumCells; _uniformity = 1.0 / (1 + totalDeviations * _invNumCells); // 0: very wide distribution, 1: very uniform } function fadeRGB() { var holdAmount = 1 - _fadeSpeed; var totalDeviations = 0; var currentDeviation = 0; _avgDensity = 0; _avgSpeed = 0; for (var i = 0; i < self.numCells; i++) { self.uOld[i] = 0; self.vOld[i] = 0; self.rOld[i] = 0; self.gOld[i] = 0; self.bOld[i] = 0; _avgSpeed = self.u[i] * self.u[i] + self.v[i] * self.v[i]; var dR = Math.min(1.0, self.r[i]); var dG = Math.min(1.0, self.g[i]); var dB = Math.min(1.0, self.b[i]); var density = Math.max(dR, Math.max(dG, dB)); _avgDensity += density; currentDeviation = density - _avgDensity; // calc deviation for uniformity totalDeviations += currentDeviation * currentDeviation; // fade out old self.r[i] = dR * holdAmount; self.g[i] = dG * holdAmount; self.b[i] = dB * holdAmount; } _avgDensity *= _invNumCells; _avgSpeed *= _invNumCells; _uniformity = 1.0 / (1+ totalDeviations * _invNumCells); // 0: very wide distribution, 1: very uniform } function advect(bound, _d, d0, du, dv) { var i, j, i0, j0, i1, j1; var x, y, s0, t0, s1, t1, dt0, dt1; dt0 = _dt * _NX; dt1 = _dt * _NY; for (j = _NY; j > 0; --j) { for (i = _NX; i > 0; --i) { x = i - dt0 * du[FLUID_IX(i, j)]; y = j - dt1 * dv[FLUID_IX(i, j)]; if (x > _NX + 0.5) x = _NX + 0.5; if (x < 0.5) x = 0.5; i0 = parseInt(~~x); i1 = i0 + 1; if (y > _NY + 0.5) y = _NY + 0.5; if (y < 0.5) y = 0.5; j0 = parseInt(~~y); j1 = j0 + 1; s1 = x - i0; s0 = 1 - s1; t1 = y - j0; t0 = 1 - t1; _d[FLUID_IX(i, j)] = s0 * (t0 * d0[FLUID_IX(i0, j0)] + t1 * d0[FLUID_IX(i0, j1)]) + s1 * (t0 * d0[FLUID_IX(i1, j0)] + t1 * d0[FLUID_IX(i1, j1)]); } } setBoundary(bound, _d); } function advectRGB(du, dv) { var i, j, i0, j0, i1, j1; var x, y, s0, t0, s1, t1, dt0x, dt0y; var index; dt0x = _dt * _NX; dt0y = _dt * _NY; for (j = _NY; j > 0; --j) { for (i = _NX; i > 0; --i) { index = FLUID_IX[i, j]; x = i - dt0x * du[FLUID_IX(i, j)]; y = j - dt0y * dv[FLUID_IX(i, j)]; if (x > _NX + 0.5) x = _NX + 0.5; if (x < 0.5) x = 0.5; i0 = parseInt(x); i1 = i0 + 1; if (y > _NY + 0.5) y = _NY + 0.5; if (y < 0.5) y = 0.5; j0 = parseInt(y); j1 = j0 + 1; s1 = x - i0; s0 = 1 - s1; t1 = y - j0; t0 = 1 - t1; j0 = i0 + _NX2; io = FLUID_IX(i0, j0); self.r[index] = s0 * (t0 * self.rOld[i0] + t1 * self.rOld[j0]) + s1 * (t0 * self.rOld[i1] + t1 * self.rOld[j0+1]); self.g[index] = s0 * (t0 * self.gOld[i0] + t1 * self.gOld[j0]) + s1 * (t0 * self.gOld[i1] + t1 * self.gOld[j0+1]); self.b[index] = s0 * (t0 * self.bOld[i0] + t1 * self.bOld[j0]) + s1 * (t0 * self.bOld[i1] + t1 * self.bOld[j0+1]); } } setBoundaryRGB(); } function project(u, v, p, div) { var i, j, index; var h = - 0.5 / _NX; for (j = _NY; j > 0; --j) { index = FLUID_IX(_NX, j); for (i = _NX; i > 0; --i) { div[index] = h * (u[parseInt(index+1)] - u[parseInt(index-1)] + v[parseInt(index + _NX2)] - v[parseInt(index - _NX2)] ); p[index] = 0; --index; } } setBoundary(0, div); setBoundary(0, p); linearSolver(0, p, div, 1, 4); for (j = _NY; j > 0; --j) { index = FLUID_IX(_NX, j); for (i = _NX; i > 0; --i) { u[index] -= 0.5 * _NX * (p[parseInt(index+1)] - p[parseInt(index-1)]); v[index] -= 0.5 * _NY * (p[parseInt(index + _NX2)] - p[parseInt(index - _NX2)]); --index; } } setBoundary(1, u); setBoundary(2, v); } function linearSolver(bound, x, x0, a, c) { var i, j, k, index; if (a == 1 && c == 4) { for (k = 0; k < _solverIterations; k++) { for (j = _NY; j > 0; --j) { index = FLUID_IX(_NX, j); for (i = _NX; i > 0; --i) { x[index] = ( (x[parseInt(index-1)] + x[parseInt(index+1)] + x[parseInt(index - _NX2)] + x[parseInt(index + _NX2)]) + x0[parseInt(index)]) * .25; --index; } } setBoundary(bound, x); } } else { c = 1 / c; for (k = 0; k < _solverIterations; k++) { for (j = _NY; j > 0; --j) { index = FLUID_IX(_NX, j); for (i = _NX; i > 0; --i) { x[index] = (a * (x[parseInt(index-1)] + x[parseInt(index+1)] + x[parseInt(index - _NX2)] + x[parseInt(index + _NX2)]) + x0[parseInt(index)]) * c; --index; } } setBoundary(bound, x); } } } function linearSolverRGB(a, c) { var i, j, k, index, index2, index3; c = 1 / c; for (k = 0; k < _solverIterations; ++k) { for (j = _NY; j > 0; --j) { index = FLUID_IX(_NX, j); index2 = index - _NX2; index3 = index + _NX2; for (i = _NX; i > 0; --i) { self.r[index] = ( (self.r[parseInt(index-1)] + self.r[parseInt(index+1)] + self.r[parseInt(index2)] + self.r[parseInt(index3)]) * a + self.rOld[index] ) * c; self.g[index] = ( (self.g[parseInt(index-1)] + self.g[parseInt(index+1)] + self.g[parseInt(index2)] + self.g[parseInt(index3)]) * a + self.gOld[index] ) * c; self.b[index] = ( (self.b[parseInt(index-1)] + self.b[parseInt(index+1)] + self.b[parseInt(index2)] + self.b[parseInt(index3)]) * a + self.bOld[index] ) * c; --index; --index2; --index3; } } setBoundaryRGB(); } } function linearSolverUV(a, c) { var i, j, k, index; c = 1 / c; for (k = 0; k < _solverIterations; ++k) { for (j = _NY; j > 0; --j) { index = FLUID_IX(_NX, j); for (i = _NX; i > 0; --i) { self.u[index] = ( (self.u[parseInt(index-1)] + self.u[parseInt(index+1)] + self.u[parseInt(index - _NX2)] + self.u[parseInt(index + _NX2)]) * a + self.uOld[index] ) * c; self.v[index] = ( (self.v[parseInt(index-1)] + self.v[parseInt(index+1)] + self.v[parseInt(index - _NX2)] + self.v[parseInt(index + _NX2)]) * a + self.vOld[index] ) * c; --index; } } setBoundary(1, self.u); setBoundary(2, self.v); } } function setBoundary(bound, x) { var dst1, dst2, src1, src2, i; var step = FLUID_IX(0, 1) - FLUID_IX(0, 0); dst1 = FLUID_IX(0, 1); src1 = FLUID_IX(1, 1); dst2 = FLUID_IX(_NX+1, 1); src2 = FLUID_IX(_NX, 1); if (wrap_x) { src1 ^= src2; src2 ^= src1; src1 ^= src2; } if (bound == 1 && !wrap_x) { for (i = _NY; i > 0; --i) { x[dst1] = -x[src1]; dst1 += step; src1 += step; x[dst2] = -x[src2]; dst2 += step; src2 += step; } } else { for (i = _NY; i > 0; --i) { x[dst1] = x[src1]; dst1 += step; src1 += step; x[dst2] = x[src2]; dst2 += step; src2 += step; } } dst1 = FLUID_IX(1, 0); src1 = FLUID_IX(1, 1); dst2 = FLUID_IX(1, _NY+1); src2 = FLUID_IX(1, _NY); if (wrap_y) { src1 ^= src2; src2 ^= src1; src1 ^= src2; } if (bound == 2 && !wrap_y) { for (i = _NX; i > 0 ; --i) { x[dst1++] = -x[src1++]; x[dst2++] = -x[src2++]; } } else { for (i = _NX; i > 0; --i) { x[dst1++] = x[src1++]; x[dst2++] = x[src2++]; } } x[FLUID_IX(0, 0)] = .5 * (x[FLUID_IX(1, 0)] + x[FLUID_IX(0, 1)]); x[FLUID_IX(0, _NY+1)] = .5 * (x[FLUID_IX(1, _NY+1)] + x[FLUID_IX(0, _NY)]); x[FLUID_IX(_NX+1, 0)] = .5 * (x[FLUID_IX(_NX, 0)] + x[FLUID_IX(_NX+1, _NX)]); x[FLUID_IX(_NX+1, _NY+1)] = .5 * (x[FLUID_IX(_NX, _NY+1)] + x[FLUID_IX(_NX+1, _NY)]); } function setBoundaryRGB() { if (!wrap_x && !wrap_y) return; var i, src1, src2, dst1, dst2; var step = FLUID_IX(0, 1) - FLUID_IX(0, 0); if (wrap_x) { dst1 = FLUID_IX(0, 1); src1 = FLUID_IX(1, 1); dst2 = FLUID_IX(_NX+1, 1); src2 = FLUID_IX(_NX, 1); src1 ^= src2; src2 ^= src1; src1 ^= src2; for (i = _NY; i > 0 ; --i) { self.r[dst1] = self.r[src1]; self.g[dst1] = self.g[src1]; self.b[dst1] = self.b[src1]; dst1 += step; src1 += step; self.r[dst2] = self.r[src2]; self.g[dst2] = self.g[src2]; self.b[dst2] = self.b[src2]; dst2 += step; src2 += step; } } if (wrap_y) { dst1 = FLUID_IX(1, 0); src1 = FLUID_IX(1, 1); dst2 = FLUID_IX(1, _NY+1); src2 = FLUID_IX(1, _NY); src1 ^= src2; src2 ^= src1; src1 ^= src2; for (i = _NX; i > 0 ; --i) { self.r[dst1] = self.r[src1]; self.g[dst1] = self.g[src1]; self.b[dst1] = self.b[src1]; ++dst1; ++src1; self.r[dst2] = self.r[src2]; self.g[dst2] = self.g[src2]; self.b[dst2] = self.b[src2]; ++dst2; ++src2; } } } function swapRGB() { temp = self.r; self.r = self.rOld; self.rOld = temp; temp = self.g; self.g = self.gOld; self.gOld = temp; temp = self.b; self.b = self.bOld; self.bOld = temp; } function FLUID_IX(i, j) { return (parseInt(i + _NX2 * j)); //get the index of a two dimensional array } return FSolver;
})();
(function() { var lastTime = 0; var vendors = ['ms', 'moz', 'webkit', 'o']; for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) { window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame']; window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame'] || window[vendors[x]+'CancelRequestAnimationFrame']; } if (!window.requestAnimationFrame) window.requestAnimationFrame = function(callback, element) { var currTime = new Date().getTime(); var timeToCall = Math.max(0, 16 - (currTime - lastTime)); var id = window.setTimeout(function() { callback(currTime + timeToCall); }, timeToCall); lastTime = currTime + timeToCall; return id; }; if (!window.cancelAnimationFrame) window.cancelAnimationFrame = function(id) { clearTimeout(id); };
}());
// Private Constants
var FLUID_WIDTH = 128;
var NUM_PARTICLES = 4;
var VMAX = 0.013;
var VMAX2 = VMAX * VMAX;
var ADD_DENSITY = 60000;
var VEL_MUL = 40;
// Private variables
var mainCanvas = document.createElement('canvas');
mainCanvas.setAttribute('width', '900');
mainCanvas.setAttribute('height', '500');
mainCanvas.setAttribute('id', 'canvas');
var mainContext = document.getElementsByClassName('context')[0];
mainContext.appendChild(mainCanvas);
var canvasWidth = mainCanvas.width;
var canvasHeight = mainCanvas.height;
var sx = mainCanvas.width / mainCanvas.offsetWidth;
var sy = mainCanvas.height / mainCanvas.offsetHeight;
var cx = 0, cy = 0;
mainCanvas.width = FLUID_WIDTH;
mainCanvas.height = FLUID_WIDTH;
var ctx = mainCanvas.getContext('2d');
var sw = mainCanvas.width;
var sh = mainCanvas.height;
var isw = 1 / sw;
var ish = 1 / sh;
var mx = 4.0;
var my = 0;
var aspectRatio = sw * ish;
var dx, dy;
var lastX, lastY;
// Initialize GUI values
var GUI = new function() { this.viscosity = 0.00006; this.fadeSpeed = 0.0012; this.densityMul = 0.98; this.density = ADD_DENSITY; this.velMul = VEL_MUL; this.fluidWidth = FLUID_WIDTH; this.numParticles = NUM_PARTICLES; this.solverIterations = 4; this.doVorticity = false; return this;
}
var partList = new Array();
var fSolver = new FS.Solver(); fSolver.mainSolver(GUI.fluidWidth, parseInt(GUI.fluidWidth * sh / sw));
fSolver.viscosity = GUI.viscosity; fSolver.fadeSpeed = GUI.fadeSpeed; fSolver.solverIterations = GUI.solverIterations;
fSolver.vorticityConfinement = GUI.doVorticity;
var fsWidth = fSolver.width;
var fsHeight = fSolver.height;
var image = ctx.createImageData(fsWidth, fsHeight);
var data32 = new Uint32Array(image.data.buffer);
var frameCount = 0;
var drawMode = 0, drawParticles = true, drawFluid = false, drawLines = false, mouseDown = false, addVel = true, add = true;
var counter = 0;
var gui = new dat.GUI({autoPlace:false, width: 270, align: "left"});
gui.domElement.style.position = 'relative';
gui.domElement.style.top = '60px';
gui.domElement.style.left = '80px';
var datGUI = document.getElementById('gui');
datGUI.appendChild(gui.domElement);
var gs = gui.addFolder('General settings');
gs.open();
gs.add(GUI,'viscosity').min(0.00001).max(0.001).step(0.00001).name('Viscosity').onChange(function(value) { fSolver.viscosity = value });
gs.add(GUI,'fadeSpeed').min(0.0006).max(0.009).step(0.0001).name('Fade speed').onChange(function(value) { fSolver.fadeSpeed = value });
gs.add(GUI,'density').min(10000).max(90000).step(100).name('Density').onChange(function() { fSolver.updateDensity() });
gs.add(GUI,'velMul').min(10).max(100).step(1).name('Velocity').onChange(function() { fSolver.addCellVelocity() });
gs.add(GUI,'densityMul').min(0.7).max(1.1).step(0.1).name('Density Mult.').onChange(function(value) { GUI.densityMul = value });
gs.add(GUI,'solverIterations').min(3).max(10).step(1).name('Solver Iteration').onChange(function(value) { GUI.solverIterations = fSolver.solverIterations = value;} );
gs.add(GUI,'doVorticity').onFinishChange(function(e) { if (GUI.doVorticity) { fSolver.vorticityConfinement = true; } else { fSolver.vorticityConfinement = false; }
});
gui.add(fSolver, 'reset').name('Clear');
render();
function draw() { var i=0, j; ctx.fillStyle = '#000'; ctx.fillRect(0, 0, mainCanvas.width, mainCanvas.height); ctx.fill(); for (; i < fSolver.numCells; i++) { j = fSolver.density[i]; if (j > 255) j = 255; data32[i] = (255 << 24) | // alpha, 255 = 100% opacity (j << 16) | // blue (j << 8) | // green j; // red image.data[i * 4 + 0] = j; image.data[i * 4 + 1] = j; image.data[i * 4 + 2] = j; image.data[i * 4 + 3] = 255; } ctx.putImageData(image, 0, 0);
}
function getScrollX() { return window.pageXOffset || window.document.documentElement.scrollLeft;
}
function getScrollY() { return window.pageYOffset || window.document.documentElement.scrollTop;
}
function getMousePos(event) { event.preventDefault(); dx = event.pageX - (getScrollX() + mainCanvas.getBoundingClientRect().left)- lastX; dy = event.pageY - (getScrollY() + mainCanvas.getBoundingClientRect().top) - lastY; lastX = event.pageX - (getScrollX() + mainCanvas.getBoundingClientRect().left) - cx; lastY = event.pageY - (getScrollY() + mainCanvas.getBoundingClientRect().top) - cy; return { x: lastX, y: lastY }
}
function getTouchPos(event) { event.preventDefault(); dx = event.changedTouches[0].pageX - (getScrollX() + mainCanvas.getBoundingClientRect().left) - lastX; dy = event.changedTouches[0].pageY - (getScrollY() + mainCanvas.getBoundingClientRect().top) - lastY; lastX = event.changedTouches[0].pageX - (getScrollX() + mainCanvas.getBoundingClientRect().left); lastY = event.changedTouches[0].pageY - (getScrollY() + mainCanvas.getBoundingClientRect().top); lastX = lastX > 0 ? (lastX < canvasWidth ? lastX : canvasWidth) : 0; lastY = lastY > 0 ? (lastY < canvasHeight ? lastY : canvasHeight) : 0; return { x: lastX, y: lastY }
}
function render() { var id = requestAnimationFrame(render); loop();
}
function uiFeedback() { var x = ~~(lastX / GUI.numParticles); var y = ~~(lastY / GUI.numParticles); if (x > fSolver.width || y > fSolver.height) return; var c = getIndexForCellPosition(x, y); if (!mouseDown) { if (dx==undefined) return; return; } if (addVel) { fSolver.uOld[c] += dx / GUI.numParticles * GUI.velMul; fSolver.vOld[c] += dy / GUI.numParticles * GUI.velMul; } // TODO for more velocity and density, we could pick a radius around the mouse for more fluid injection. if (add) { fSolver.source[c] += GUI.density; }
}
function getIndexForCellPosition(i,j) { return i + (fsWidth) * j;
}
mainCanvas.addEventListener('mousemove', onMouseMove);
mainCanvas.addEventListener('mousedown', function(event) { event.preventDefault(); cx = event.pageX - (getScrollX() + mainCanvas.getBoundingClientRect().left) - lastX; cy = event.pageY - (getScrollY() + mainCanvas.getBoundingClientRect().top) - lastY; mouseDown = true;
});
mainCanvas.addEventListener('mouseup', function(event) { event.preventDefault(); mouseDown = false;
});
// Mobile devices touch events
mainCanvas.addEventListener('touchstart', function(event) { event.preventDefault(); lastX = event.changedTouches[0].pageX - (getScrollX() + mainCanvas.getBoundingClientRect().left); lastY = event.changedTouches[0].pageY - (getScrollY() + mainCanvas.getBoundingClientRect().top); mouseDown = true;
});
mainCanvas.addEventListener('touchmove', onTouchMove);
mainCanvas.addEventListener('touchend', function(event) { event.preventDefault(); mouseDown = false;
});
function loop() { for (var i=0; i < fSolver.numCells; i++) { fSolver.vOld[i] = 0; fSolver.uOld[i] = 0; fSolver.densityOld[i] = 0; } uiFeedback(); for (var i=0; i < fSolver.numCells; i++) { fSolver.densityOld[i] += fSolver.source[i]; fSolver.source[i] *= GUI.fadeSpeed; // additional code to create dissipatation fSolver.density[i] *= GUI.densityMul; } fSolver.updateVelocity(); fSolver.updateDensity(); draw();
}
function onMouseMove(e) { if (getMousePos(e).y <= 40) return;
}
function onTouchMove(e) { if (getTouchPos(e).y <= 40) return;
}
Developer | Endre Simo |
Username | esimov |
Uploaded | November 28, 2022 |
Rating | 3.5 |
Size | 8,584 Kb |
Views | 8,096 |
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