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Tutorials » 3D

Lighting on 3D Objects
Author: Mr10 | Website: http://www.mr10.net |

The Code

Most of the code hangs on the light source:

onClipEvent(load) {
 this._x=414.0;
 this._y=198.0;
 // a * 3 is radius of circle -----
 a = 59;
 i = 0;
 _root.ratio=50;
 _root.convrad=Math.PI/180
 // x base & y base (in stead of 0,0)
 xb = 198.0;
 yb = 198.0;
 function SinMouseX(AngleX) {
 return Math.cos(Math.PI/180 * (_root.DgrMouseX - AngleX));
 }
 function AlphaMouseX(Z,X) {
 return ((_root.DgrMouseZ/Z) * _root.ratio + X * (100 - _root.ratio));
 }
 }
onClipEvent(enterFrame) {
 // making the light move -----
 i++;
 if (i>= 360) { i=i - 360 }
 // must be in radians (not degrees)
 theta=(_root.convrad) * i;
 // -------------------------------
 // path of lightsource -----------
 if (_root.lightsource == "manual") {
 xm = _root._xmouse;
 ym = _root._ymouse;
 } else if (_root.lightsource == "automatic"){
 xm = xb + (2 * a * Math.cos(theta) + a * Math.cos(2 * theta));
 ym = yb + (2 * a * Math.sin(theta) - a * Math.sin(2 * theta));
 }
 // -------------------------------
 // pythagoras for angle mouse & x,ybase
 xt= xm - xb;
 yt= ym - yb;
 _root.DeltaX=Math.sqrt(xt * xt + yt * yt);
 // -------------------------------
 // z is angle upwards: x,ybase -> light = radius = 180
 _root.DgrMouseZ=int(Math.acos(_root.DeltaX/180) / _root.convrad);
 _root.DgrMouseX=int(Math.atan(yt/xt) / _root.convrad);
 // -------------------------------
 // recompute flash-angles to normal-angles
 if(xt <0 && yt> 0){
 _root.DgrMouseX += 270;
 } else if(xt <0 && yt <= 0){
 _root.DgrMouseX += 270;
 } else if(xt>= 0 && yt <= 0){
 _root.DgrMouseX += 90;
 } else if(xt>= 0 && yt>= 0){
 _root.DgrMouseX += 90;
 }
 // -------------------------------
}

This is the code on the facets:

onClipEvent(load) {
 // angle of this facet -----------
 FacetZ=45;
 FacetX=63.75;
 }
onClipEvent(enterFrame) {
 XTemp=_root.light.SinMouseX(FacetX);
 // set alpha
 this._alpha = _root.light.AlphaMouseX(FacetZ,XTemp);
}

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