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 Tutorials » 3D
The light sourceThe light source is symbolized by xm and ym. These coordintates either represent the coordinates of the mouse, or are put on the path of a function.
For this path I chose a deltoid. I found this function on this page written by Paul Bourke in 1990. // 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"){
// you can replace this function for any other you like better
xm = xb + (2 * a * Math.cos(theta) + a * Math.cos(2 * theta));
ym = yb + (2 * a * Math.sin(theta) - a * Math.sin(2 * theta));
}
// -------------------------------
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Lighting on 3D Objects
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