I found this question very interesting since I had recently done some work on modeling projectile motion with drag. Point 1: You are essentially updating the position and velocity using an explicit/forward Euler iteration where each new value for the states should be a function of the old values. In such a case, you should … Read more
The simple way is don’t test Object vs Object collisions, populate an array with the center point of each ball. Then, from each center scan a a square of size 4*radius centered on that point (you can optimize this a bit by not using a square, at the expense of making the code more complex). … Read more
Here are some resources I assembled a few years ago. Of note is the Verlet Integration. I am also including links to some open source and commercial physics engines I found at that time. There is a stackoverflow article on this subject here: 2d game physics? Physics Methods Verlet Integration (Wikipedia Article) Advanced Character Physics … Read more
I don’t know of a perfect solution, and I have a feeling that one does not exist. Even if you could accurately predict the future position of the vehicle, you would be unable to predict the way the user will operate the controls. So the problem comes down to minimizing the negative effects of client/server … Read more
There is no way to dynamically increase the heap programatically since the heap is allocated when the Java Virtual Machine is started. However, you can use this command java -Xmx1024M YourClass to set the memory to 1024 or, you can set a min max java -Xms256m -Xmx1024m YourClassNameHere
This may be a bit oversimplified so far as actual math, but meant as an intuitive guide to Runge Kutta integration. Given some quantity at some time t1, we want to know the quantity at another time t2. With a first-order differential equation, we can know the rate of change of that quantity at t1. … Read more
You might think that because your walls are aligned with the coordinate axes that it makes sense to write special case code (for a vertical wall, negate the x-coordinate of the velocity; for a horizontal wall, negate the y-coordinate of the velocity). However, once you’ve got the game working well with vertical and horizontal walls, … Read more
take a signal, a time-varying voltage v(t) units are V, values are real. throw it into an FFT — ok, you get back a sequence of complex numbers units are still V, values are complex ( not V/Hz – the FFT a DC signal becomes a point at the DC level, not an dirac delta … Read more
What languages/environments have you used for developing scientific software, esp. data analysis? What libraries? (E.g., what do you use for plotting?) I used to work for Enthought, the primary corporate sponsor of SciPy. We collaborated with scientists from the companies that contracted Enthought for custom software development. Python/SciPy seemed to be a comfortable environment for … Read more
You get position by integrating the linear acceleration twice but the error is horrible. It is useless in practice. Here is an explanation why (Google Tech Talk) at 23:20. I highly recommend this video. It is not the accelerometer noise that causes the problem but the gyro white noise, see subsection 6.2.3 Propagation of Errors. … Read more