jcayzac

V = sphere.center - cone.apex_location
a = V * cone.direction_normal
b = a * cone.tan
c = sqrt( V*V - a*a )
d = c - b
e = d * cone.cos

now  if ( e >= sphere.radius ) , cull the sphere
else if ( e <=-sphere.radius ) , totally include the sphere
else the sphere is partially included.

jcayzac

V = sphere.center - cone.apex_location
a = dotProduct(V, cone.direction_normal)
p = a * cone_sin
q = cone_cos * cone_cos * dotProduct(V, V) - a*a
r = q - sphere_radius * sphere_radius

if ((p < sphere_radius) || (q > 0)) {
	if (r < 2 * sphere_radius * p)
		return -1; // Sphere and cone enveloppes intersect
	else if (q < 0)

jcayzac

V = sphere.center - cone.apex_location
a = dotProduct(V, cone.direction_normal)
x = cone.cos * sqrt(dotProduct(V,V) - a*a) - a*cone.sin

if (abs(x) > sphere.radius) {
	if (x < 0)
		return 1; // Sphere is totally included in cone
	else
		return 0; // Sphere and cone don't intersect at all
}

jcayzac

jcayzac

#include <math.h>

/// Computes the sine and cosine of two angles
/// in: angles = Two angles, expressed in radians, in the [-PI,PI] range.
/// out: results = vector containing [sin(angles[0]),cos(angles[0]),sin(angles[1]),cos(angles[1])]
static inline void vsincos(const float angles[2], float results[4]) {
    static const float constants[]  = { 
    /* q1 */  0,                M_PI_2,           0,                M_PI_2,
    /* q2 */  M_PI,             M_PI,             M_PI,             M_PI,
    /* q3 */  4.f/M_PI,         4.f/M_PI,         4.f/M_PI,         4.f/M_PI,

jcayzac

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import sys

WIDE_MAP = dict((i, i + 0xFEE0) for i in xrange(0x21, 0x7F))
WIDE_MAP[0x20] = 0x3000

def widen(s):
    """
    Convert all ASCII characters to the full-width counterpart.

jcayzac

#include <cstdio>
#include <unistd.h>
#include <cstdlib>
#include <X11/Xlib.h>
#include <X11/extensions/xf86vmode.h>
#include <iostream>
using ::std::cerr;
using ::std::endl;

int main(void) {

jcayzac

jcayzac

Title

This is a test of an extended markdown syntax for use in my blog. @more .

@tags Code, Algorithms, Blog, CSS Tutorials @date 2012-02-02T18:20:00 GMT+9 @from 139.5, 9.88 "Yokohama, Japan"

jcayzac

// http://paulirish.com/2011/requestanimationframe-for-smart-animating/
// http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating

// requestAnimationFrame polyfill by Erik Möller
// fixes from Paul Irish and Tino Zijdel and Julien Cayzac

(function() {
	var lastTime = 0,
		vendors = ['ms', 'moz', 'webkit', 'o'],
		x,