/*
 *	aegis - project change supervisor
 *	Copyright (C) 1993, 2006, 2008 Peter Miller.
 *
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation; either version 3 of the License, or
 *	(at your option) any later version.
 *
 *	This program 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 General Public License for more details.
 *
 *	You should have received a copy of the GNU General Public License
 *	along with this program. If not, see
 *	<http://www.gnu.org/licenses/>.
 */

const black = color(0, 0, 0);
const white = color(1, 1, 1);
const skin = looks(white * 0.8);

looks
pt(h)
	hit	h;
{
	if (h.osi.x ^ 2 + h.osi.y ^ 2 >= (31/32) ^ 2)
		return looks(black);
	return skin;
}

void
main()
{
	const pi = 4 * atan(1);
	scalar j;
	const studs = 7;
	const stud_rad = 0.1;
	const stud_placement = 0.7;
	const thick = 0.1;

	ellipsoid
	(
		point(0, 0, 0),
		point(1, 0, 0),
		point(0, 0, 1),
		point(0, thick, 0),
		pt
	);
	background(white);
	ellipsoid
	(
		point(0, -0.1, 0),
		vector(stud_rad, 0, 0),
		vector(0, stud_rad, 0),
		vector(0, 0, stud_rad),
		skin
	);
	for (j = 0; j < studs; j = j+ 1)
	{
		scalar ang;
		ang = j*(2*pi/studs)+pi/2;
		ellipsoid
		(
			point
			(
				cos(ang) * stud_placement,
				-thick * sqrt(1 - stud_placement ^ 2),
				sin(ang) * stud_placement
			),
			vector(stud_rad, 0, 0),
			vector(0, stud_rad, 0),
			vector(0, 0, stud_rad),
			skin
		);
	}
	light(vector(0.4, 1, -0.4), white);
	view
	(
		vector(0, 1, 0),
		point(-1, -4, -1),
		vector(2, 0, 0),
		vector(0, 0, 2)
	);
	image_size(64, 64);
	jittered_sampling(4);
}