Developed under Japan’s Kyushu Institute of Technology’s 4th Joint Global Multi-Nation Birds Satellite (BIRDS-4) Project, these cube satellites were launched on February 21, 2021 at the National Aeronautics and Space Administration (NASA) Station in Virginia, United States through the S.S. Katherine Johnson Cygnus spacecraft at 1:36 AM PST. Download Cheat Engine 7.2 For Mac This installer makes use of the installcore software recomendation pluginNote: Some anti-virus programs mistakenly pick up parts of Cheat Engine as a trojan/virus. If encountering trouble while installing, or cheat engine is not functional, disable your anti-virus before installing or running Cheat Engine(More. MacOS (formerly 'Mac OS X' and later 'OS X') is a line of open core graphical operating systems developed, marketed, and sold by Apple Inc., the latest of which is pre-loaded on all currently shipping Macintosh computers. MacOS is the successor to the original classic Mac OS, which had been Apple's primary operating system since 1984. Since version 3.0.0, QEMU uses a time based version numbering scheme: major incremented by 1 for the first release of the year minor reset to 0 with every major increment, otherwise incremented by 1 for each release from git master. Infinite Loop Apple News & Rumors iOS iPad iPhone iPod Touch iOS Development Mac Hardware iMac Mac Pro Mac mini MacBook Pro MacBook Air Mac OS X Support Mac Software Other Apple Hardware Laptops Laptop Compatibility Big Sur Laptop Support Big Sur Laptop Guides. Operating System Basics & Help. Threads 447 Messages 1.9K. Threads 447 Messages 1.
For this assignment you will program a physically-based simulation of a jello cube.The jello cube is made of elastic material, much like the jello sold in grocery stores.When the jello cube is stretched, it will try to contract. When squeezed together, it will tend to inflate back to the original shape.In order to simulate the jello, you will use a 3D mass-springnetwork, which is a very common tool in physically based modeling,especially with interactive systems.
Note: Please don't get discouragedby the length of this document. Starter code for this assignment alreadyprovides a lot of the code, including all of the OpenGL rendering code andnumerical integration code. Once you have read this webpage carefully andunderstood the starter code, you will see that this assignment isnot very difficult - but it does take its time, so please start early.
Undeformed jello cube | Deformed jello cube |
You will model a cube of jello, which, when undeformed, has the shape of a cube of dimensions 1 meter x 1 meter x 1 meter.The cube will be constrained to stayin the interior of a bounding box of dimensions 4 meters x 4 meters x 4 meters.The center of the bounding box is located at the originof the world-coordinate system.The axes of the boundingbox are aligned with the world-coordinate system axes.The cube will stretch, contract, oscillate, change velocity, bounce off the walls of the bounding box,based on the physicallaws for a mass-spring system.The cube will initially be positioned inside the box.When the cube reaches one of the walls of the bounding box, it shouldbounce off that wall back towards the interior of the bounding box.
A real-world jello cube is a continuous object, and if we were to simulate everysmall infinitesimal part of the elastic material,infinite memory would be required.For this reason, we will discretize the jello cube. This approach (discretization)is very common inphyisically-based modeling, and also appliedmathematics and engineering in general.The cube will be modeled by 8 * 8 * 8 = 512 discrete mass points, all of equal mass.In the undeformed configuration, the mass points will form a uniform grid covering the volume of the cube. They will be positioned at (i / 7, j / 7, k / 7),where i, j, k are in { 0, 1, 2, 3, 4, 5, 6, 7 }.The rest length of all the springs will be determinedbased on the positions of the mass points in the undeformed configuration.As the cube deforms, the points will change position, giving us theshape of the cube at any given moment of time.Note that as the cube deforms, the points will no longer be the same distance apart from their neighbors.At places where the jello cube is squeezed, the points will be closer together,and where it is stretched, they will be farther apart than in the undeformed position.
The points with i=0 or i=7 or j=0 or j=7 or k=0 or k=7 are the pointson the boundary of the cube. We will call these point surface points,since they define the surface of the jello cube.There are a total of 296 surface points.The surface of the cube can be rendered by drawing triangles connecting the surface points.The complete OpenGL code to do the cube rendering is providedin showCube.cpp.Interior points are not necessary for rendering, asthey are invisible. They are, however, necessary for simulating physics.You will model the movement of the cube by numerically solving a system of ordinary differential equations, which sounds perhapsa bit scary, but is actually not that difficult.The equations to be solved incorporate Newton's second law (F=ma), Hook's linear modelof elasticity (F=kx), and linear damping (F=-kv). To solve the differential equations, you will use two methods:Euler integration, and Runge-Kutta 4th order (RK4) integration.The starter code already provides code which implements both the Euler method and the RK4 method - look for it in physics.cpp.All you have to do is appropriately call either of these twomethods during the simulation. For a particular simulation,you will typically just use one of the two methods - butyou have to make sure that both methods work correctlywith your code.
You will have to implementthe acceleration function (computeAcceleration, see physics.cpp).This function takes as input the positions ofthe 512 nodes, the velocities of the 512 nodes, plus the physical parameters of the model. It returns theacceleration for each of the 512 points. It also adds any effectsof an external force field, if such a field is present of course.In general, the acceleration will of course bedifferent for each of the 512 simulation points.To compute the acceleration, the function must take into account the forces due to
Initially, the cube will be in some prescribed **deformed** position, with some prescribed initial velocities.Your program will read the information about the initial position of the cube, initial velocity, and variousother simulation parameters from a file on disk. The movement of the jello cubewill depend on the information given in this file.We shall call these files 'world' files,because they describe the initial world (state) of the jello cube.The default extension for these files is .w (example: jello1.w) . Several world files are provided with the assignment,so that you can test your code. Included in the starter code is the routine loadWorldwhich loads all the information from a world fileinto processor memory. There is also a routine writeWorld which works in the opposite direction:it saves the current point positions, velocities, and other parameters to a valid world file on disk.See the comments in the input.cpp filefor parameters to these two routines. Also, the starter code provides a separate application called createWorld.It can be found in the starting package (createWorld.cpp) . This application allows you to create your own world files withouthaving to manually edit world files.For more info about createWorld and fora description of the structure of a world file, click here.
The cube will deform as a result of different velocities at different locations inside the cube.The velocity differences will happen for three reasons:
You have to implement collision detection and response for the jello cubehitting any of the six walls of the bounding box.
The world file might also specify an external non-homogeneous time-independent(i.e. possibly varying with location, but not with time)force field. If the force field is present, you must model its effect on the cube.The force field is given as an array of vectors, each specifying the 3D force vector (in Newtons) at a nodeof a 3D discrete grid. Note that this is a different grid than the jello cube grid;this force field grid covers the entire scene bounding box.Use interpolation to obtain values of the force field at an arbitrary position inside the bounding box.The grid is uniform, covers precisely the volume of the bounding box, and consists of n x n x n equally spaced points,where the parameter n is the resolution of the grid. It is specified in the world file.For this assignment, you need to support values of 2 <= n <= 30.
The provided slides (PDF PDF, black and white, good for printing)contain information on:
To obtain a good view of the scene, the camera has to be positioned appropriately.The starter code already provides a complete code to do this (see jello.cpp). It allowsthe user to move the camera around in real-time, andobserve the jello-cube from different angles.The description of the method to position the camera is here.
Your program will allow two rendering modes: wireframe and triangle.In the wireframe mode, only the surface points (no filled triangles) are shown,together with the structural springs connecting them. Structural springs are one ofthe three kinds of springs that are used with the mass-spring system. You can learn moreabout this from the provided slides (see the Helper slides section).In the triangle mode, surface of the cubeis rendered as triangles (and the surface points are vertices of these triangles).Start-up code provides supports both for the wireframe and trianglerendering mode.It is possible for the user to switch among the two rendering methods at run-time, by pressing 'v' (see also showCube.cpp).Also, in wireframe mode, user can independently turnon/off the display of structural springs, shear springsand bend springs. Thus, any of the 8 on/off combinations can be selected.Pressing 's','h','b' toggles the display of structural, shear and bend springs, respectively.Note that to avoid screen clutter,only the springs connecting two surface points are shown,but the simulation of course has to simulate the structural, shear and bend springs appropriately connecting all the 512 simulation points.
In the triangle mode, the jello is illuminatedusing proper OpenGL lighting.Starter code provides a complete lighting environment in jello.cpp . You are free to change lighting parameters, or make otherrendering improvements/modifications.This way, you can personalize your assignment -otherwise all the cubes for the entire class will lookthe same (except for any differences in implementationof physics of course), which would makefor a quite boring final assignment movie.
Also, you might be awarded credit for any other creative orinteresting solution to an issue in your implementation, as long as it iswell-documented in your readme file.So, if you can think of any interesting feature, feel free to implement it.
Please note that the amount of extra credit awarded will not exceed 25% ofthis assignment's total value.
This assignment consists of two applications: jello and createWorld. Starter code provides a complete implementation forcreateWorld, which is a tool to design your own physical environments. createWorld is a single-file application,and independent from the rest of the assignment. Its implementation is createWorld.cpp .
You will be developing the application called 'jello'.The main files for this application are jello.h and jello.cpp,but several other files are used as well.
In the starter package, all of these files already contain code for pre-implementedfunctionality such as lighting, camera positions, integrators, etc.You can modify any of these files in any way you want and you can add your own files, if you need to.Also in the starter package, there are some examples of world files.You can download the complete starter package here.
Installing OpenGL and GLUT:Windows, Linux and Mac OS X come with OpenGL preinstalled. On Linux and Mac, GLUT will also already be installed.If you are using Mac OS X Mojave, make sure you have updatedthe OS to the latest version; otherwise, you may get erroneous behavior such as a black screen.For Windows, we provide GLUT with the starter code.You should be able to build the starter code in MSVisual Studio 2017by opening hw1.sln and clicking 'Build'. There are two projects: 'jello' and 'createWorld'; 'jello' is the main driver. Note: Because there are many versions of Windows 10 (different build versions), you may get an error: This can be solved, as the message says, by right-clicking the solution and selecting 'Retarget solution'.
Here is one suggested workflow for solving the assignment.You can of course take alternative routes.
In addition to your code and the README file,you are required to submit an animation, represented by aseries of JPEG images which are screenshots from your program.Do not exceed 300 frames. The frame rate for the animation should be 15 fps, which corresponds to 20 seconds of animation running time.Please name your JPEG frames 000.jpg, 001.jpg, and so on. Note that 15 fps here refers to the frame rate at whichthe animation is to be played. It is NOT the frame rate ofyour program when you are creating the screenshots.Your program will of course slow down when creating the screenshotsbecause it has to save the files to disk. This is normal.
In the animation, you should try to demonstrate your resultsin some interesting way. Show your OpenGL lighting skills, apply texture,and above all, show interesting deformations and dynamics.In order to create the animation, you can create your own world files, as you see fit.
How to create the animation: Starter code includes the functionalityto output the current screen to a 'Portable Pixel Format' (PPM) file.You can always take the screenshot of the current screen by pressing spacebar.In order to capture an animation, comment the 'saveScreenToFile=0' line in the 'doIdle' routine, and press spacebar to launch the continuous frame capture. You can then convert the PPM files to JPEG using any image manipulation program that supports batch file conversion. For example,you can use the freely available IrfanView program.
Please submit:
Please submit the assignment using the USC Blackboard. In order to do so, create a single zip file containingyour entire submission. Submit this fileto the blackboard using the 'Attach File' field.After submission, please verify that your zip file has beensuccessfully uploaded.You may submit as many times as you like.If you submit the assignmentmultiple times, we will grade your LAST submission only.Your submission time is the time of your LAST submission; ifthis time is after the deadline, late policy will apply to it.
Note: The instructor will read your code.Quality of your code and comments might affect your grade.This is an individual assignment.Your code might be compared to code of other studentsusing a code comparison tool.
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You can use it for simple additions or for complex formula using and assigning variables and constants Variables and constant can be managed and assigned in a intuitive to use table (in a separate window) with simple clicks Performed calculations can be displayed in a separate log window (content retained over re-launches)
Using it in an advanced way, Calcline offers mathematical expressions with infinite level of parenthesis to nest expressions and a large selections of math functions as: