markjlorenz

CMRotationMatrix rotationMatrixFromGravity(float x, float y, float z)
{	
	// The Z axis of our rotated frame is opposite gravity
	vec3f_t zAxis = vec3f_normalize(vec3f_init(-x, -y, -z));
	
	// The Y axis of our rotated frame is an arbitrary vector perpendicular to gravity
	// Note that this convention will have problems as zAxis.x approaches +/-1 since the magnitude of
	// [0, zAxis.z, -zAxis.y] will approach 0
	vec3f_t yAxis = vec3f_normalize(vec3f_init(0, zAxis.z, -zAxis.y));
	

markjlorenz

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

markjlorenz

#!/usr/bin/env ruby
#/ Usage: <progname> [options]...
#/ How does this script make my life easier?
# ** Tip: use #/ lines to define the --help usage message.
$stderr.sync = true
require 'optparse'

# default options
flag    = false
option  = "default value"

markjlorenz

# Is there a coffeescript way of doing this?

(function($, exports){
  # doing random stuff here
})(jQuery, window);

# Other than this:

( ($, exports) ->
  # doing random stuff here