Plank rotation and intermediate connection!

We have made some progress regarding the rotation of the planks. In our previous blogg posts the planks of the bridge have had a locked rotation. Using the function AddForceAtPosition from Unitys build in rigidbody solution, we managed to connect our own springs to the corners of the plank causing the rotation of the planks to act in a more normal fashion than they did before! See the videos below for the improvement in behaviour of the bridgeplanks.

Before:

After:


We have also connected the appropriate plank edges together making the planks follow eachother. For example if one plank is hit by an object and gets dragged down, the others will follow (see video below). Oh and don´t mind the falling red robot in the background :)




A challenge that waits us ahead is to integrate all the different systems (springs, wind, planks breaking) into one project in Unity, this is due us team members on this project working on different systems in parallell. We are also considering implementing our own rigidbody system for the simulation.


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Project specification

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Team: Make HOOKE great again Team members: Adam Torkkeli-Johansson (adamjoha@kth.se), Ramtin Erfani (ramtin1995@gmail.com), Gabriel Gessle (gessle@kth.se) Project: Rope Bridge Simulation The simulation that we would like to do is a simulation of a classic rope bridge. To do this we plan on using spring forces between certain points on the rope bride to simulate a “hanging/bouncing” behavior. This project is inspired by a previous project in the Models and Simulation course called “Epic Rope Bridge”. We plan on using Unity to make this a real time simulation and like stated above we intend to use spring forces between points on the bridge to simulate the bridges behavior. Although there is built in support for spring systems in Unity we plan on implementing our own versions of spring behaviour using Hooke’s law. As a start we plan on implementing either Euler or Runge-Kutta (RK4) integration methods for location approximations. If we have enough time we will also i...
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Piecing Everything Together - Our Final Project

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Pressure calculation on planks

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We've recently implemented a feature that allows us to calculate the pressure on a given plank. This allows us to set a threshold whenever we want the plank to shatter (using the shatter implementation we recently made a post about). This is what it currently looks like if we manually increase the mass of our cube: To accomplish this simulation, we used the physics formula for pressure which is: P = -F/A Where P is the pressure, F is the magnitude of the normal force and A is the area of the collision. To get P, we first of calculate the normal force using the following formula: F = m*g*cos(theta) Where m is the mass of the object, g is the gravitational field strength and theta is the angle of the inclined surface (currently only looking at the incline on the x-axis, we will be looking into expanding this to atleast one more axis). The mass of the object and constant g are easy to grab, theta however is generated by looking at the difference in rotation of the object ...
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