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lighting.js
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lighting.js
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if(!dojo._hasResource["dojox.gfx3d.lighting"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
dojo._hasResource["dojox.gfx3d.lighting"] = true;
dojo.provide("dojox.gfx3d.lighting");
dojo.require("dojox.gfx._base");
(function(){
var lite = dojox.gfx3d.lighting;
dojo.mixin(dojox.gfx3d.lighting, {
// color utilities
black: function(){
return {r: 0, g: 0, b: 0, a: 1};
},
white: function(){
return {r: 1, g: 1, b: 1, a: 1};
},
toStdColor: function(c){
c = dojox.gfx.normalizeColor(c);
return {r: c.r / 255, g: c.g / 255, b: c.b / 255, a: c.a};
},
fromStdColor: function(c){
return new dojo.Color([Math.round(255 * c.r), Math.round(255 * c.g), Math.round(255 * c.b), c.a]);
},
scaleColor: function(s, c){
return {r: s * c.r, g: s * c.g, b: s * c.b, a: s * c.a};
},
addColor: function(a, b){
return {r: a.r + b.r, g: a.g + b.g, b: a.b + b.b, a: a.a + b.a};
},
multiplyColor: function(a, b){
return {r: a.r * b.r, g: a.g * b.g, b: a.b * b.b, a: a.a * b.a};
},
saturateColor: function(c){
return {
r: c.r < 0 ? 0 : c.r > 1 ? 1 : c.r,
g: c.g < 0 ? 0 : c.g > 1 ? 1 : c.g,
b: c.b < 0 ? 0 : c.b > 1 ? 1 : c.b,
a: c.a < 0 ? 0 : c.a > 1 ? 1 : c.a
};
},
mixColor: function(c1, c2, s){
return lite.addColor(lite.scaleColor(s, c1), lite.scaleColor(1 - s, c2));
},
diff2Color: function(c1, c2){
var r = c1.r - c2.r;
var g = c1.g - c2.g;
var b = c1.b - c2.b;
var a = c1.a - c2.a;
return r * r + g * g + b * b + a * a;
},
length2Color: function(c){
return c.r * c.r + c.g * c.g + c.b * c.b + c.a * c.a;
},
// vector utilities
//TODO: move vector utilities from this file to vector.js
dot: function(a, b){
return a.x * b.x + a.y * b.y + a.z * b.z;
},
scale: function(s, v){
return {x: s * v.x, y: s * v.y, z: s * v.z};
},
add: function(a, b){
return {x: a.x + b.x, y: a.y + b.y, z: a.z + b.z};
},
saturate: function(v){
return Math.min(Math.max(v, 0), 1);
},
length: function(v){
return Math.sqrt(dojox.gfx3d.lighting.dot(v, v));
},
normalize: function(v){
return lite.scale(1 / lite.length(v), v);
},
faceforward: function(n, i){
var p = dojox.gfx3d.lighting;
var s = p.dot(i, n) < 0 ? 1 : -1;
return p.scale(s, n);
},
reflect: function(i, n){
var p = dojox.gfx3d.lighting;
return p.add(i, p.scale(-2 * p.dot(i, n), n));
},
// lighting utilities
diffuse: function(normal, lights){
var c = lite.black();
for(var i = 0; i < lights.length; ++i){
var l = lights[i],
d = lite.dot(lite.normalize(l.direction), normal);
c = lite.addColor(c, lite.scaleColor(d, l.color));
}
return lite.saturateColor(c);
},
specular: function(normal, v, roughness, lights){
var c = lite.black();
for(var i = 0; i < lights.length; ++i){
var l = lights[i],
h = lite.normalize(lite.add(lite.normalize(l.direction), v)),
s = Math.pow(Math.max(0, lite.dot(normal, h)), 1 / roughness);
c = lite.addColor(c, lite.scaleColor(s, l.color));
}
return lite.saturateColor(c);
},
phong: function(normal, v, size, lights){
normal = lite.normalize(normal);
var c = lite.black();
for(var i = 0; i < lights.length; ++i){
var l = lights[i],
r = lite.reflect(lite.scale(-1, lite.normalize(v)), normal),
s = Math.pow(Math.max(0, lite.dot(r, lite.normalize(l.direction))), size);
c = lite.addColor(c, lite.scaleColor(s, l.color));
}
return lite.saturateColor(c);
}
});
// this lighting model is derived from RenderMan Interface Specification Version 3.2
dojo.declare("dojox.gfx3d.lighting.Model", null, {
constructor: function(incident, lights, ambient, specular){
this.incident = lite.normalize(incident);
this.lights = [];
for(var i = 0; i < lights.length; ++i){
var l = lights[i];
this.lights.push({direction: lite.normalize(l.direction), color: lite.toStdColor(l.color)});
}
this.ambient = lite.toStdColor(ambient.color ? ambient.color : "white");
this.ambient = lite.scaleColor(ambient.intensity, this.ambient);
this.ambient = lite.scaleColor(this.ambient.a, this.ambient);
this.ambient.a = 1;
this.specular = lite.toStdColor(specular ? specular : "white");
this.specular = lite.scaleColor(this.specular.a, this.specular);
this.specular.a = 1;
this.npr_cool = {r: 0, g: 0, b: 0.4, a: 1};
this.npr_warm = {r: 0.4, g: 0.4, b: 0.2, a: 1};
this.npr_alpha = 0.2;
this.npr_beta = 0.6;
this.npr_scale = 0.6;
},
constant: function(normal, finish, pigment){
pigment = lite.toStdColor(pigment);
var alpha = pigment.a, color = lite.scaleColor(alpha, pigment);
color.a = alpha;
return lite.fromStdColor(lite.saturateColor(color));
},
matte: function(normal, finish, pigment){
if(typeof finish == "string"){ finish = lite.finish[finish]; }
pigment = lite.toStdColor(pigment);
normal = lite.faceforward(lite.normalize(normal), this.incident);
var ambient = lite.scaleColor(finish.Ka, this.ambient),
shadow = lite.saturate(-4 * lite.dot(normal, this.incident)),
diffuse = lite.scaleColor(shadow * finish.Kd, lite.diffuse(normal, this.lights)),
color = lite.scaleColor(pigment.a, lite.multiplyColor(pigment, lite.addColor(ambient, diffuse)));
color.a = pigment.a;
return lite.fromStdColor(lite.saturateColor(color));
},
metal: function(normal, finish, pigment){
if(typeof finish == "string"){ finish = lite.finish[finish]; }
pigment = lite.toStdColor(pigment);
normal = lite.faceforward(lite.normalize(normal), this.incident);
var v = lite.scale(-1, this.incident), specular, color,
ambient = lite.scaleColor(finish.Ka, this.ambient),
shadow = lite.saturate(-4 * lite.dot(normal, this.incident));
if("phong" in finish){
specular = lite.scaleColor(shadow * finish.Ks * finish.phong, lite.phong(normal, v, finish.phong_size, this.lights));
}else{
specular = lite.scaleColor(shadow * finish.Ks, lite.specular(normal, v, finish.roughness, this.lights));
}
color = lite.scaleColor(pigment.a, lite.addColor(lite.multiplyColor(pigment, ambient), lite.multiplyColor(this.specular, specular)));
color.a = pigment.a;
return lite.fromStdColor(lite.saturateColor(color));
},
plastic: function(normal, finish, pigment){
if(typeof finish == "string"){ finish = lite.finish[finish]; }
pigment = lite.toStdColor(pigment);
normal = lite.faceforward(lite.normalize(normal), this.incident);
var v = lite.scale(-1, this.incident), specular, color,
ambient = lite.scaleColor(finish.Ka, this.ambient),
shadow = lite.saturate(-4 * lite.dot(normal, this.incident)),
diffuse = lite.scaleColor(shadow * finish.Kd, lite.diffuse(normal, this.lights));
if("phong" in finish){
specular = lite.scaleColor(shadow * finish.Ks * finish.phong, lite.phong(normal, v, finish.phong_size, this.lights));
}else{
specular = lite.scaleColor(shadow * finish.Ks, lite.specular(normal, v, finish.roughness, this.lights));
}
color = lite.scaleColor(pigment.a, lite.addColor(lite.multiplyColor(pigment, lite.addColor(ambient, diffuse)), lite.multiplyColor(this.specular, specular)));
color.a = pigment.a;
return lite.fromStdColor(lite.saturateColor(color));
},
npr: function(normal, finish, pigment){
if(typeof finish == "string"){ finish = lite.finish[finish]; }
pigment = lite.toStdColor(pigment);
normal = lite.faceforward(lite.normalize(normal), this.incident);
var ambient = lite.scaleColor(finish.Ka, this.ambient),
shadow = lite.saturate(-4 * lite.dot(normal, this.incident)),
diffuse = lite.scaleColor(shadow * finish.Kd, lite.diffuse(normal, this.lights)),
color = lite.scaleColor(pigment.a, lite.multiplyColor(pigment, lite.addColor(ambient, diffuse))),
cool = lite.addColor(this.npr_cool, lite.scaleColor(this.npr_alpha, color)),
warm = lite.addColor(this.npr_warm, lite.scaleColor(this.npr_beta, color)),
d = (1 + lite.dot(this.incident, normal)) / 2,
color = lite.scaleColor(this.npr_scale, lite.addColor(color, lite.mixColor(cool, warm, d)));
color.a = pigment.a;
return lite.fromStdColor(lite.saturateColor(color));
}
});
})();
// POV-Ray basic finishes
dojox.gfx3d.lighting.finish = {
// Default
defaults: {Ka: 0.1, Kd: 0.6, Ks: 0.0, roughness: 0.05},
dull: {Ka: 0.1, Kd: 0.6, Ks: 0.5, roughness: 0.15},
shiny: {Ka: 0.1, Kd: 0.6, Ks: 1.0, roughness: 0.001},
glossy: {Ka: 0.1, Kd: 0.6, Ks: 1.0, roughness: 0.0001},
phong_dull: {Ka: 0.1, Kd: 0.6, Ks: 0.5, phong: 0.5, phong_size: 1},
phong_shiny: {Ka: 0.1, Kd: 0.6, Ks: 1.0, phong: 1.0, phong_size: 200},
phong_glossy: {Ka: 0.1, Kd: 0.6, Ks: 1.0, phong: 1.0, phong_size: 300},
luminous: {Ka: 1.0, Kd: 0.0, Ks: 0.0, roughness: 0.05},
// Metals
// very soft and dull
metalA: {Ka: 0.35, Kd: 0.3, Ks: 0.8, roughness: 1/20},
// fairly soft and dull
metalB: {Ka: 0.30, Kd: 0.4, Ks: 0.7, roughness: 1/60},
// medium reflectivity, holds color well
metalC: {Ka: 0.25, Kd: 0.5, Ks: 0.8, roughness: 1/80},
// highly hard and polished, high reflectivity
metalD: {Ka: 0.15, Kd: 0.6, Ks: 0.8, roughness: 1/100},
// very highly polished and reflective
metalE: {Ka: 0.10, Kd: 0.7, Ks: 0.8, roughness: 1/120}
};
}

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