It is unity Plugin for developers who wish to create jello like soft bodies.. It is created using spring mass pressure model.

1. Soft Body Simulation

2. What is Soft body?
A soft body is basically an object which changes its overall shape due to external forces acting on
it. Some examples that we commonly see include cloth, balloons and jelly.

3. Applications for soft body simulations:-
Computer Graphics (animation)
Virtual Reality
Games
And many more…

4. Existing Soft Body Models
Spring-Mass based models
- easy implementation, weak results
FEM, FEV based techniques
- great results, complicated implementation, slow
Fluid based model
- good results, not for realtime

5. Purpose
"...to create model which will be fast, easy in
implementation and gives good soft bodies
behavior."

6. Problem statement
To design a plugin for Unity developers that helps in simulation of interactive soft body (Jell-O
like) with spring mass and pressure model in Unity
To develop an AR based Android application to visualize this simulation.
This soft body can be any given mesh and/or parts of a given mesh.
We can merge different meshes also.

7. Spring Mass Pressure Model
Spring :
Each edge of the mesh is converted into springs with a spring constant and a damping constant.
User can change these constants according to their needs.
Mass : Each vertex has a definite mass which can be
modified by the user. User can change Gravitational
force constant.
Pressure: Pressure is applied inside the mesh so that it
Can behave like a balloon. User can change Pressure constant.

8. Background of Pressure Model
Create Spring Mass System
Create a simple cloth.
Apply wind force (left -> right)
We will see a deformation in the cloth.

9. Algorithm proposed
Create closed shape of the cloth
And.. put "source of the wind" inside.

10. Wind Source??
Wind source basically provide a pressure to the mesh.
We can consider a gas which will provide the necessary pressure.
- We will put an ideal gas inside of the body
- And apply some basic physics to it.

11. Ideal Gas Approximation
Pressure value is described by Ideal Gas Equation:
P V = nRT
P- pressure value
V- volume of the body
n- particles number
R- gas constant
T- gas temperature

12. Pressure Force calculation
We can calculate pressure to a point with this equation:-
And for pressure:-
Assume n, R and T are constant. So we have to calculate the volume of the body.

13. Volume
We use gauss theorem to calculate volume of the body.
Collision detection and response are also handled.
If F is a continuously differentiable vector field defined on a neighborhood of V, then we have
The left side is a volume integral over the volume V, the right side is the surface integral over the boundary of the volume V.

14. Implementation

15. Novelty
The diagram below compares the existing spring mass model
with the new spring mass with pressure model.

16. AR based Android App
- Uses Vuforia AR library.
- Designed to visualize soft body simulations of 3D figures from every angle and at every step of
simulation.
- Start/Stop functionality.

17. Results

18. AR application

19. Conclusion
Pressure Model of Soft Body behavior
it is fast.
gives good Soft behavior in real time.
it is easy for implementation.

20. Future Work
Increase the performance of our algorithm to give better results in less amount of time.
Increase user interaction in the mobile app.
Design a mobile AR based game for better understanding of soft body for educational purposes.
Stabilize the system for inter-mesh collisions.
Collision with other rigid bodies and soft bodies would be incorporated.

21. Thank You..!!