3D JavaScript Animation Javascript

Javascripts > Misc Javascripts > 3D JavaScript Animation

Script Title: 3D JavaScript Animation

Description: 3D rotating cuboid. Not sure what this could be good for, but here it is.

Example: Available

Text to be replaced with graphics.

Copy the following code into your <HEAD></HEAD> tags.

<style type="text/css"> div.z2 { position:absolute; z-index:2; } div.z1 { position:absolute; z-index:1; } </style> <script type="text/javascript"> /************************************************************************** JavaScript Graphics Library 0.0.1, Updated Source Code at Scriptersoft.com Copyright (C) 2005 Kurt L. Whicher November,13,2005 This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA **************************************************************************/ //________________________________________ global variables var S_piDoubled=Math.PI*2; var S_deg2Rad=Math.PI/180; //_______________________________________________ functions function S_matrix() { return [1,0,0,0, 0,1,0,0, 0,0,1,0, 0,0,0,1]; } function S_vec2D(x,y) { this.x=x; this.y=y; } function S_vec3D(x,y,z) { this.x=x; this.y=y; this.z=z; } function S_subVec2D(a,b) { return new S_vec2D(a.x-b.x, a.y-b.y); } function S_subVec3D(a,b) { return new S_vec3D(a.x-b.x, a.y-b.y, a.z-b.z); } function S_dotVec3D(a, b) { return a.x*b.x+a.y*b.y+a.z*b.z; } function S_cross(a,b) { return new S_vec3D( a.y*b.z-a.z*b.y, a.z*b.x-a.x*b.z, a.x*b.y-a.y*b.x); } function S_lengthSquaredVec3D(v) { return S_dotVec3D(v,v); } function S_lengthVec3D(v) { return Math.sqrt(S_lengthSquaredVec3D(v)); } function S_normalizeVec3D(v) { var l=S_lengthVec3D(v), nv=new S_vec3D(0,0,0); if(l!=0) { nv.x=v.x/l; nv.y=v.y/l; nv.z=v.z/l; } return nv; } function S_rotate(m,ax,a) { // transformation matrix, axis, angle var i,j,ij=new Array(),v=new Array(),c=Math.cos(a),s=Math.sin(a); if (ax=="x") ij=[1,2,5,6,9,10,13,14]; else if (ax=="y") ij=[2,0,6,4,10,8,14,12]; else if (ax=="z") ij=[0,1,4,5,8,9,12,13]; for (i=0;i<8;i++) v[i]=m[ij[i]]; for (i=0,j=1;i<8;i+=2,j+=2) { m[ij[i]]=v[i]*c-v[j]*s; m[ij[j]]=v[i]*s+v[j]*c } } function S_checkBrowser() { if (document.getElementById) return true; else return false; } function S_zIndex(e,z) { document.getElementById(e).style.zIndex=z; } function S_rgbColor(r,g,b) { var i, c=[r,g,b]; for(i=0; i<3; i++) { c[i]=Math.floor(c[i]); if(c[i]<0) c[i]=0; else if(c[i]>255) c[i]=255; } return c; } function S_rgbColorString(c) { return "rgb("+c[0]+","+c[1]+","+c[2]+")"; } function S_vertice(x,y,z) { this.x=x; this.y=y; this.z=z; this.w=1; this.t=new S_vec3D(x,y,z); // transformed 3d this.p=new S_vec2D(0,0); // projected 2d } function S_face(v0,v1,v2,c) { // 3 vertice faces this.v=[v0,v1,v2]; this.c=c; this.b=0; // b:brightness this.d=true; // display: true or false } // x coordinate, number of vertices, distance function S_verticeRing(x,nv,d) { var i,a,v=new Array(); for(i=0;i<nv;i++) { a=S_piDoubled*i/nv; v[i]=new S_vertice(x,d*Math.sin(a),d*Math.cos(a)); } return v; } function S_triangleRing(r1,r2,c,clr) { // rows 1 & 2, cols, color var i,j,tr=new Array(); for(i=0,j=1;i<c;i++,j=++j%c) { tr.push(new S_face(r1+i,r2+i,r2+j,clr)); tr.push(new S_face(r1+i,r2+j,r1+j,clr)); } return tr; } function S_model(v,f) { // vertice & face arrays, transformation matrix, display boolean this.v=v; this.f=f, this.tm=S_matrix(), this.d=true; } S_model.prototype.S_rotateX=function(a) { S_rotate(this.tm,"x",a*=S_deg2Rad); } S_model.prototype.S_rotateY=function(a) { S_rotate(this.tm,"y",a*=S_deg2Rad); } S_model.prototype.S_rotateZ=function(a) { S_rotate(this.tm,"z",a*=S_deg2Rad); } S_model.prototype.S_show=function() { this.d=true; } S_model.prototype.S_hide=function() { this.d=false; } function S_cube(d,c) { //distance & color return new S_cone(d,d,Math.cos(Math.PI/4)*d*2,1,4,c); } function S_cylinder(w,h,r,c,clr,e) { return new S_cone(w,w,h,r,c,clr,e); } // width, height, "rows", "columns", color, ends function S_cone(w1,w2,h,r,c,clr,e) { var i,r1=0,r2=c,v=new Array(),t=new Array(),rxc=r*c; for(i=0;i<=r;i++) v=v.concat(S_verticeRing(h*(0.5-i/r),c,w1*i/r+w2*(r-i)/r)); for(i=0;i<r;i++,r1+=c,r2+=c) t=t.concat(S_triangleRing(r1,r2,c,clr)); if (e!="hideEnds") for(i=1;i<(c-1);i++) { t.push(new S_face(0,i,i+1,clr)); t.push(new S_face(rxc,rxc+i+1,rxc+i,clr)); } return new S_model(v,t); } function S_sphere(d,r,c,clr) { // distance, "rows">=2, "columns">=3, color paramaters var v=new Array(),t=new Array(),r_1xc=(r-1)*c,r_2xc=(r-2)*c; var i,j,tmp,r1=0,r2=c; for(i=1;i<r;i++) { tmp=Math.PI*i/r; v=v.concat(S_verticeRing(d*Math.cos(tmp),c,Math.sin(tmp)*d)); } v.push(new S_vertice( d,0,0)); v.push(new S_vertice(-d,0,0)); for(i=0;i<(r-2);i++,r1+=c,r2+=c) t=t.concat(S_triangleRing(r1,r2,c,clr)); for(i=0,j=1;i<c;i++,j=++j%c) { t.push(new S_face(r_1xc,i,j,clr)); t.push(new S_face(r_1xc+1,r_2xc+j,r_2xc+i,clr)); } return new S_model(v,t); } S_model.prototype.S_scale=function(x) { this.tm[0]*=x; this.tm[5]*=x; this.tm[10]*=x; } S_model.prototype.S_faceColor=function(i,c) { this.f[i].c=c; } S_model.prototype.S_scaleX=function(s) { this.tm[0]*=s; } S_model.prototype.S_scaleY=function(s) { this.tm[5]*=s; } S_model.prototype.S_scaleZ=function(s) { this.tm[10]*=s; } function S_scene(dv,l,t,w,h,cmra) { // left, top, width, height this.dv=dv; this.ps=1; // pixel size this.l=l; this.t=t; this.w=w; this.h=h; this.cx=l+w/2; this.cy=t+h/2; // center x, center y this.dt="paint"; // output type this.m=new Array(); // model array this.lght=new S_light(); this.lc=S_rgbColor(255,255,255); // light color this.cmra=-cmra; // camera on z axis this.bfr=S_buffer(h,w); } function S_buffer(h,w) { var i, j, b=new Array(); for(i=0;i<h;i++) { b[i]=new Array(); for(j=0;j<w;j++) b[i][j]=new S_pixel(); } return b; } function S_pixel() { // display boolean, color this.d=true; this.c=0; } S_pixel.prototype.S_setColor=function(c) { this.d=true; this.c=c; } S_pixel.prototype.S_hide=function() { this.d=false; } S_scene.prototype.S_pixelSize=function(ps){ this.ps=ps; } S_scene.prototype.S_widthAndHeight=function(w,h){ this.w=w; this.h=h; } S_scene.prototype.S_center=function(cx,cy){ this.cx=cx; this.cy=cy; } S_scene.prototype.S_paint=function(){ this.dt="paint"; } S_scene.prototype.S_models=function() { var i; this.m=new Array(); for(i=0;i<arguments.length;i++) this.m.push(arguments[i]); } S_scene.prototype.S_lightColor=function(c){ this.lc=c; } S_scene.prototype.S_project=function() { var i, j, v, tm, d, m; for(i=0;i<this.m.length;i++) { m=this.m[i]; tm=this.m[i].tm; for(j=0;j<m.v.length;j++) { v=m.v[j]; v.t.x=v.x*tm[0]+v.y*tm[4]+v.z*tm[8]+v.w*tm[12]; v.t.y=v.x*tm[1]+v.y*tm[5]+v.z*tm[9]+v.w*tm[13]; v.t.z=v.x*tm[2]+v.y*tm[6]+v.z*tm[10]+v.w*tm[14]; d=(this.cmra-v.t.z/2); if (d<0) { v.p.x=(this.cmra*v.t.x/d)+this.cx; v.p.y=-(this.cmra*v.t.y/d)+this.cy; } } } } S_scene.prototype.S_display=function(disp){ var i, j, k, s="", ds, c, cnt=0; // ds:div start this.tr=new Array(); // triangles ready to draw this.S_project(); this.S_adjustLight(); this.S_clearBuffer(); for(i=0;i<this.m.length;i++) { this.m[i].S_setupFaces(this.tr,this.lght.t); for(j=0;j<this.tr.length;j++) { // loop through triangles c=S_divColor(this.tr[j].c,this.lc,this.tr[j].b); S_setupBuffer(this,this.tr[j].p,c); } } for(i=0;i<this.h;i++) { ds=-1; for(j=0,k=1;j<this.w;j++,k++) { if((this.bfr[i][j].d==true)&&(ds==-1)) ds=j; if( (this.bfr[i][j].d==true)&& ( (k==this.w)|| (this.bfr[i][k].d==false)|| (!S_sameColor(this.bfr[i][j].c, this.bfr[i][k].c)) ) ) { s+=S_divString(S_rgbColorString(this.bfr[i][j].c),this.t+i*this.ps,this.l+ds*this.ps,this.ps,(k-ds)*this.ps); ds=-1; cnt++; } } } S_writeInnerHTML(this.dv,s); if(disp=="ShowCount") alert(cnt); } S_scene.prototype.S_displayAndShowCount=function(){ this.S_display("ShowCount"); } S_model.prototype.S_setupFaces=function(tr,lght) { var i, j, fn, v, p=new Array(); // vertice & projection arrays var z=new Array(); for(i=0;i<this.f.length;i++) { // loop through faces v=this.f[i].v; for(j=0;j<3;j++) { p[j]=this.v[v[j]].p; } for(j=0;j<3;j++) { z[j]=this.v[v[j]].t.z; } if (((p[1].x-p[0].x)*(p[2].y-p[0].y))<((p[2].x-p[0].x)*(p[1].y-p[0].y))) { this.f[i].d=true; fn=S_faceNormal(this.v[v[0]].t, this.v[v[1]].t, this.v[v[2]].t); this.f[i].b=S_faceIntensity(fn,lght); tr.push(new S_triangle(fn,this.f[i].b,p.slice(),this.f[i].c,z)); } else { this.f[i].d=false; } } } // normal, brightness, array of 2D projection coordinates, and z depth function S_triangle(fn,b,p,c,z) { this.fn=fn; this.b=b; this.p=p; this.z=z; this.c=c; } function S_faceNormal(a,b,c){ var cr=S_cross(S_subVec3D(b,a), S_subVec3D(b,c)); return S_normalizeVec3D(cr); } function S_faceIntensity(fn,lght) { var i=S_dotVec3D(fn,lght); return (i>0)?i:0; } function S_divColor(c,lc,b) { // c:array of colors var i, clr=new Array(); for(i=0;i<3;i++) clr[i]=Math.floor(c[i]+(lc[i]-c[i]+1)*b); for(i=0;i<3;i++) if (clr[i]>lc[i]) { clr[i]=lc[i]; } return S_rgbColor(clr[0],clr[1],clr[2]); } function S_sameColor(a,b) { for(var i=0;i<3;i++) { if(a[i]!=b[i]) return false; } return true; } function S_setupBuffer(scn,p,c) { // temp, counters, min, max, scanline, vertice & slope arrays var t,i,j,xmin=new Array(),xmax=new Array(),sl; var v=new Array(), m=new Array(); p.sort(function(a,b) { return a.y-b.y; } ); for(i=0;i<3;i++) p[i].y=Math.floor(p[i].y); v[0]=S_subVec2D(p[1],p[0]); v[1]=S_subVec2D(p[2],p[0]); v[2]=S_subVec2D(p[2],p[1]); for(i=0;i<3;i++) { m[i]=(v[i].y!=0)?v[i].x/v[i].y:0; } for(i=0,sl=scn.t;i<scn.h;i++,sl++) { xmin[i]=1000;xmax[i]=0; if((sl>=p[0].y)&&(sl<=p[2].y)) { xmin[i]=xmax[i]=Math.floor(p[0].x+m[1]*(sl-p[0].y)); } if((sl>=p[0].y)&&(sl<=p[1].y)) { t=Math.floor(p[0].x+m[0]*(sl-p[0].y)); if(t<xmin[i]) xmin[i]=Math.floor(t); else if(t>xmax[i]) xmax[i]=Math.floor(t); } if((sl>=p[1].y)&&(sl<=p[2].y)) { t=Math.floor(p[1].x+m[2]*(sl-p[1].y)); if(t<xmin[i]) xmin[i]=Math.floor(t); else if(t>xmax[i]) xmax[i]=Math.floor(t); } for(j=0;j<scn.w;j++) if((j>=(xmin[i]-scn.l))&&(j<=(xmax[i]-scn.l))) { scn.bfr[i][j].d=true; scn.bfr[i][j].c=c; } } } function S_light() { this.x=0; this.y=1; this.z=0; this.w=1; // original coordinates this.t=new S_vec3D(0,1,0); // transformed coordinates this.tm=new S_matrix(); } S_scene.prototype.S_adjustLight=function() { var m=this.lght.tm, l=this.lght; l.t.x=l.x*m[0]+l.y*m[4]+ l.z*m[8]+l.w*m[12]; l.t.y=l.x*m[1]+l.y*m[5]+ l.z*m[9]+l.w*m[13]; l.t.z=l.x*m[2]+l.y*m[6]+ l.z*m[10]+l.w*m[14]; l.t=S_normalizeVec3D(l.t); } S_scene.prototype.S_lightRotateX=function(a) { S_rotate(this.lght.tm,"x",a*=S_deg2Rad); } S_scene.prototype.S_lightRotateY=function(a) { S_rotate(this.lght.tm,"y",a*=S_deg2Rad); } S_scene.prototype.S_lightRotateZ=function(a) { S_rotate(this.lght.tm,"z",a*=S_deg2Rad); } S_scene.prototype.S_clearBuffer=function() { for(var i=0;i<this.h;i++) for(var j=0;j<this.w;j++) this.bfr[i][j].d=false; } function S_divString(b,t,l,h,w) { var s='<div style="background-color:'+b+';position:absolute;'; s+='top:'+t+'px;left:'+l+'px;height:'+h+'px;width:'+w; return s+'px;font-size:0;visibility:visible"></div>'; } function S_writeInnerHTML(id,text) { document.getElementById(id).innerHTML = text; } </script>

Copy the following code between the <BODY></BODY> tags of your html page.

<div class="z1" id="graphicsDiv">Text to be replaced with graphics.</div> <script type="text/javascript"> if(S_checkBrowser()) { var intrvl; // Create a new scene with parameters for // div id, left, top, width, height, and camera distance var scn=new S_scene("graphicsDiv",75,25,100,100,300); scn.S_pixelSize(3); // set scene pixel size var c=S_rgbColor(0,0,127); // color var c2=S_rgbColor(0,127,127); // color var m=new S_cube(18,c); // model m.S_faceColor(4,c2); m.S_faceColor(5,c2); m.S_scaleX(2.5); // scale model along x axis scn.S_models(m); // add model(s) to scene scn.S_lightRotateX(-25); // adjust light function r(){ // rotation function m.S_rotateX(11); // rotate model around y axis m.S_rotateY(5); // rotate model around y axis m.S_rotateZ(7); // rotate model around z axis scn.S_display(); // display scene } // end rotation function intrvl=setInterval('r();',75); } </script>

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