Any Intel Mac capable of running Mac OS X Tiger 10.4.5 is capable of booting from USB (so long as the version of Mac OS X on that USB is at least Mac OS X Tiger 10.4.5. Since all MacBook models are Intel Macs, the model year is irrelevant aince all Intel Macs are capable of booting from USB so long as they're running Mac OS X 10.4.5 or later. Trouble installing PETSc on Mac OS X. Ask Question Asked 9 years, 1 month ago. Does 'artificial gravity' created in a spinning spaceship last forever? Hey, thanks for watching! Everything that you'll needis and will be down below! (Music, Links, Discords, etc)Also, Calamari is for windows aswell!If you want. RDP issues on mac. Impossible to connect to shared folders from Windows XP to Mac OS X 10.10. Does 'artificial gravity' created in a spinning.

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At a glance

Our Verdict

The “endless running” genre that was first made so popular by Semi-Secret Software’s Canabalt has been explored in many recent App Store releases, and Miniclip‘s Gravity Guy looks to expand further on the idea by introducing an interesting gravity-based mechanic into the mix.

Gravity Guy throws you into the shoes of a mysterious gnome figure with the ability to flip gravity at will. You’ve just escaped from prison, and now you’re on the run from what appear to be law-enforcement robots. It’s a minimalist story at best, but it does a decent enough job of setting up the action that follows.

As the gnome, you’ll run from left to right automatically. A robot will always be hot on your tail, so the trick is to not get caught up on parts of the environment, or you’ll be caught and promptly zapped with a laser gun. The only real tool at your disposal is your ability to flip gravity, which can be accomplished by tapping anywhere on the screen. You’ll have to use timing and your character’s momentum to successfully make it across large gaps, while other level segments will require you to rapidly switch gravity to avoid small gaps in levels.

An interesting (and I think problematic) part of the game’s design is that flipping gravity while in midair simply doesn’t work. This often makes the game unnecessarily frustrating, especially because of the speed at which later levels move. There are plenty of checkpoints, but I found myself dying over and over again so many times in some segments that the game was no longer fun. It’s a very trial-by-error sort of game, and while that actually works for games like Super Meat Boy or Mega Man, the fact that you have no real control over your character’s movement makes Gravity Guy downright frustrating.

There’s a multiplayer mode that allows up to four players to gather around one iPhone screen and compete to see who can survive for the longest amount of time, but (as you might imagine) even two fingers jabbing at an iPhone at once is enough to completely obscure the on-screen action from all of the players, so that too is a throwaway addition.

Gravity Guy isn’t a bad game, especially at its price point, but players who put any amount of time over 20 minutes into the game will find that eventually it becomes something of a joyless chore to play. If you’re in need of a pick-up-and-play title to tide you over on your commute the game might be worth considering, but most gamers will want to pass on this one.

[Ryan Rigney is a frequent contributor to Macworld.]

an artificial-gravity simulation program

Copyright ©Theodore W. Hall

Permission is granted to make and distribute verbatim copies of thissoftware and documentation provided the copyright notice and this permissionnotice are preserved on all copies.

The software is distributed as is, without warranty of any kind, eitherexpressed or implied, including, but not limited to, the implied warranties ofmerchantability and fitness for a particular purpose.

Last update: 2010-11-13 19:33:00-05:00

Installation

Step 1: Download the appropriate version for yoursystem:

Step 2: Unpack the '.tgz' file. This willcreate a directory that contains the program and a copy of thisdocument. In the following, replace archive with thebasename of the archive you downloaded in Step 1:

gunzip archive.tgz;tar -xvf archive.tar;

Mac users: Stuffit Expander basically works, but it handles file extensionsdifferently. You may end up with several 'sdr-mac-*' folders. The one to keep is the one that contains 9 items. The 'gunzip' and'tar' commands in the UNIX command line shown above (typed in the Terminalapp) are consistent with the other UNIX platforms.

Operation

Program Layout

The program opens a new window with several graphic and text areas,referred to below as 'boxes'. Numbered left-to-right and top-to-bottom,they are:

Command Keys

Particle Control

Specify the initial Height, Velocity, and Angle of the free-fallingparticles, in meters, meters per second, and degrees of elevation from 'east'(prograde). You may control these parameters eithergraphically (box 4), ortextually (box 9).

The three values are independent.

Rotation Control

Specify the Radius (meters), the RPM (rotations per minute), and theG-factor (multiples of Earth gravity). You may control theseparameters either graphically(boxes 5, 6, 7) or textually(box 10).

These parameters are inter-dependent: specifying values for any two ofthem determines the value of the third one as well. Whenever you assigna value to any of the parameters, that parameter receives the highestpriority. The program then recomputes the parameter with the lowestpriority (least recently specified by you), according to the values of theother two.

The equations are:

Vector Control

Use the mouse in box 4 to drag either the head or thetail of the vector.

Press on the small green particle to select the tail of the vector. Drag the particle vertically up or down to set its initial height (inmeters). Horizontal displacement is ignored. The particle'sinitial velocity and angle are unaffected - the head of the vector moves withthe tail.

Press anywhere else in box 4 - away from the particle -to select the head of the vector. It's not necessary to be near thehead. This allows you to distinguish between the head and the tail whenthe vector has zero length. Drag the head anywhere within the box toset the particle's initial velocity and angle. The initial height isunaffected.

To accommodate a convenient human scale for both height and velocity, thegraphic velocity unit is 10 meters per second. (This affects only thelength of the vector in box 4, not the numeric value inbox 9.) The viewport allows an initial height of 10meters, and an initial horizontal velocity of 50 meters per second, eitherprograde or retrograde. A 90-mile-per-hour fastball corresponds toabout 40 meters per second.

Values that are out-of-range graphically may be input astext in box 9. The graphicvector is clipped to box 4.

Slider Control

Use the mouse in boxes 5, 6, 7 to drag the verticalsliders for Radius, RPM, and G-factor. The sliders are scaled toaccommodate an 'interesting' range of values, both inside and outside of thesupposed 'comfort zone' for rotation.

Values that are out-of-range graphically may be input astext in box 10. The slidersare clamped to boxes 5, 6, 7.

Text Input

The prompt field in box 8 is arbitrarily long,depending on the program's window size. The numeric fields inboxes 9 and 10 allow six characters.

The user interface is a bit quirky. (See the section onHistory.) Briefly:

• Text input in box 8 (Messages and prompts) is triggered by some other command, such as <Shift><F1> or <F4>. Answer the prompt, or type ! or stop to abort the command. See the section on Command Keys.

• To enter text input in box 9 (Particle Control) or box 10 (Rotation Control), click the mouse or press <Return> or <Enter> anywhere in the box. Each box contains three numeric fields. The fields are not individually selectable.

• The insertion point is initially at the end of the first field. The text is not selected. To edit the field, you must first press <Backspace>, <Ctrl>H, or <Delete>.

• <Return>, <Enter>, or <Ctrl>M accept the field value and move the cursor to the end of the next field. <Tab> does nothing.

• <Backspace> or <Ctrl>H delete the character before the insertion point.

• <Delete> deletes the entire field.

• The left and right arrows move the insertion point within the field.

• You may enter expressions. Six characters don't provide much space for that, but you can, for example, type 1/6 for the G-factor to simulate Lunar gravity.

Fun and Games

The most interesting effects occur when you throw the particles up andagainst the rotation, especially when the radius is small. Play withsmall radii and fast rotations and see why these are uncomfortable. (The artificial gravity is quite unnatural.) Make up your owngames. For example:

• Try to throw a particle across a diameter of the rotating environment, and catch it on the other side, as seen in the inertial view.

• Try to throw a particle 180 degrees against the rotation, at just the right velocity, so that it's stationary in the inertial view.

• Launch a stream of particles from the floor to simulate a fountain. Experiment with the velocity and angle to get loops and cusps in the stream.

Caveat

The purpose of this program is to illustrate the 'shape' of the artificialgravity field. It is not a complete simulation of particlephysics. In particular, it does not consider atmospheric effects; itanimates the particles as if they were in a vacuum. For low relativevelocities, at the 'human scale', this is close enough. However, withlarge relative velocities or long distances, the rotating atmosphere may exerta significant force on a moving body, depending on the body's size, shape, anddensity. Atmospheric effects are beyond the scope of this program.

Plot Files

The plot file format is a relic of the Merit computer network at theUniversity of Michigan. It was designed to describe simple pen plotsin a text format. The filesrdplot.c andrdplot.f contain sampleprogram source code, in C and FORTRAN, for reading and decoding the plot fileformat. You're on your own to modify those programs to actually producegraphic output.

I've considered revising the plot function to produce a PostScriptfile. I have a function library for creating PostScript files, but itwould take moderate effort to revise this program to use it. If that'ssomething you'd like, e-mailme. The squeaky wheel gets the grease.

History and Miscellany

I originally wrote this program as part of mydoctoralresearch, in 1987, in the Architecture and Planning Research Laboratory(APRL) at the University of Michigan. I wroteit in FORTRAN 77 on Apollo workstations running the Aegis operating system,the Apollo Display Manager (DM), and the ApolloGraphics Primitives (GPR). The X Window System,xlib, xt, and Motif were not available. I wrote all of the interaction- the vector, the sliders, the text input - from low-level events and graphicprimitives. Thus the program's somewhat quirky non-Motif look andfeel.

This program links to an APRL utility library to handle textinput and convert characters to real numbers. Originally, thecharacter-to-real converter was a fairly small subroutine that handled onlysigns, digits, and decimal points. Later, Jim Turner and I replaced itsguts with a call to a home-grown subsystem that handles general algebraicexpressions. Voila! Virtually every APRL programthat prompts for real-number input can now accept those expressions. This program inherits that feature, though its small text fields don't allowfor much of an expression.

In other work, Eduardo Sobrino and I wrote a function library to emulateApollo GPR through xlib, allowing us to port APRLprograms from the Apollo to X workstations. This program also links tothat library. It looks and feels in X essentially the same as it didin Apollo GPR.

This program generally tries to open a new full-size child of the rootwindow. In my experience, with SGI 4Dwm and Sun CDE (both apparentlyMotif derivatives) the window is appropriately resized to accommodate thewindow manager's decorations. With Sun OpenLook, the window manager'sdecorations may be clipped. You can still move and resize the windowif necessary.

Mac Os Catalina

For Apollo aficionados: By default, the program initializes graphicsin GPR_$BORROW mode. In true GPR, that'sroughly equivalent in X to grabbing the server and drawing on the rootwindow. In X, that would be considered pretty rude. The xlibGPR emulator normally handles GPR_$BORROW by openinga new full-size child of the root window, managed by the window manager (Motifor whatever). You can override the window manager by setting theenvironment variable GPR_BORROW to 'STRICT' before running theprogram. For example, in csh:

setenv GPR_BORROW STRICT

Artificial Gravity Mac Os Download

The GPR emulator then sets the xlib window'soverride_redirect attribute to True, resulting in atrue full-screen window without manager decoration. It looks like trueGPR_$BORROW, though the window is still a child of the root (notthe root itself), and the program still doesn't grab the server.

Mac Os Versions

The command-line option -d causes the program to initialize inGPR_$DIRECT mode. It opens a new large window (nearly fullscreen) and initializes graphics in that window. In true ApolloGPR, this is necessary if the program is to share the displaywith others; it must 'acquire' the display before performing any graphic I/O,and 'release' the display (allowing others to acquire it) before a certainmaximum time expires. In the GPR emulator, the end resultis essentially the same as the default GPR_$BORROW without'STRICT', except that there is some additional overhead in emulating the'acquire' and 'release' functions (including raising the window, installingthe color map, and setting the event mask).