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PHYSICS BASED

SLINGSHOT SIMULATOR

9V Battery Lickers

TABLE OF CONTENTS

01

02

04

03

What our solution is about

Intro and Problem statement

What we did

Our Solution

What we can do next

Future implementations

Wow!

Live Demo

THE TEAM

Intro and

Problem statement

01

Main problem statement

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Requirements

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Accurately pinpoint the position of a shooter shooting slingshot projectiles into windows.

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• Need to create a simulation to determine the path of projectile that:
• Does not travel in a straight line over short distances
• Changes trajectory when deflecting or ricocheting off surfaces
• Simulates realistic physics of projectiles under certain scenarios
• Using the information, accurately estimate shooter position

Current Scenario given

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Assumptions

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Given Assumptions:

Additional Assumptions:

Current measures + flaws

Aims

Protrusion Rods

Laser Based Trajectories

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Flaws:

1. Requires physical setup (costly)
2. Does not account for gravity or wind resistance
3. Bulky and infeasible for long distances such as in the problem statement
4. Time consuming to obtain results

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1. High accuracy
2. Quick and easily repeatable for multiple scenarios
3. Easily accessible
4. Cost effective

Our

solution

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CLOUD BASED

Slingshot simulator program

How it is better

We used Unity with built in real time accurate physics, along with our own calculations

Cloud based. Access the program anytime, anywhere.

Accurate physics simulation engine

Fully digitalized

Get your results in mere seconds! All for a fraction of the time due to no physical setup

Fast and cheap

Set up the perfect scenario to suit your needs with our highly modular settings panel

Customizable

Our solution

In Action

Our Solution In Action

• Freely select windows
• Realtime physics at 500 calculations per second
• Automatic readjustment for better accuracy
• Tracers for easier visualization

Features

Extreme customizability

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• Adjust calculation density for more accurate results

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• Adjust wind speed, distance and number of building floors to fit your scenario

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• Speed up simulation speed for faster calculations

Features

Post simulation settings

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• Most accurate shooter position will be marked in cyan

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• Enable heatmap to show the most accurate general shooter area

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• Free cam mode to fly around and inspect the simulation

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• Accuracy display limit slider to narrow down the general location of the shooter

Trajectory Models Used

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c is the drag coefficient of the ball.

A is the frontal surface area of the ball, modelled as a sphere of radius r.

p is the density of air, which we have taken to be 1.225 kg m^-3

Accuracy

Accuracy is the likelihood of it being the culprit.

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Accuracy (%) = 100 * (y( x/90) + z(V / V_max))

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Where (x) is the angle of impact 90 - a,

V is the impact velocity

V_max is the initial velocity

y + z = 1

Final accuracy is the average of both windows

100%

50%

90 - a

Features

Accuracy Weight bias

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• Allows you to change the formula of the accuracy equation

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• Applies more impact to either Velocity of Impact or Angle of Impact during accuracy calculations in real time

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• Results can be seen instantly without extra loading required

100 * (y( x/90) + z(V / V_max))

LIVE

DEMO

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TRY IT WITH US!

LIVE

DEMO

(Some settings only work on Windows)

Bugs and glitches apply

Also available for Windows, Linux, WebGL and Mac On our github page

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Recommended

Cloud hosted

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http://18.141.198.4:5000

Github Pages

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kinneh04.github.io

The future of

Our product

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Scenario Manager

Setup scenarios for any situation (prototype)

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• Real world scenarios
• Create new scenarios to fit your needs!

Scenario Maker

Create a new Scenario easily using Google Maps API (prototype)

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• Pan and zoom the map to locate culprit buildings

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• Pick 2 buildings anywhere on the map

Scenario Maker

All processes are automated.

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• The application will automatically generate a scenario based on the data given by the user

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• Save and reload the scenario at any time!

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• Saved scenarios are stored locally in browser cookies

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• Scenarios can also be saved and imported to and from a database using PHP / SQL

Other expansions

Use the slingshot simulator app on your phone!

Mobile Port

Pre calculation and caching of data for even faster results!

Hashmaps

Getting of obstacles from google maps API for more accurate calculations

Obstacles

Use past data to identify trends in shooter locations in buildings and around singapore

Trendmap

Other expansions

Improving and optimizing physics calculations to allow for > 1000 calcs / s

Physics improvements

Real time visualization of air flow from gusts and winds to help improve customizability and accuracy

Air flow visualization

Questions?

The end

Our Solution

In Action

Future Expansions

Scenario Manager - Adds in UI for users to easily import different HDB models and to vary their dimensions as needed

• features a map for easy reference to previously created simulations (if a simulation had been done on that location before)

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Cloud-based - easy access for officers on the ground and easy setup - available on mobile too - Results can be cached for faster simulations

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Live Demo

Slingshot Simulator

By 9V Battery Lickers

Team Members