Simulation of the blast wave?

Help & Support
1

I spent a lot of time on that to make a blast wave with decreasing damage … None of which did not work out. :sob:

Does anyone have any ideas?

2

Do you mean decreasing damage by distance?
What is not working out? The formula to calculate the damage?
Is the wave circular?

3

Yes wave is the ball, as have a blast

all that you have written

4

so given the max radius of the sphere r where the damage will be zero, and given the max damage at distance zero D, you could calculate the damage based on a distance from the center d in a linear way:

// max wave radius
var r = 10;
// max damage
var D = 100;
// current distance from the center
var d = 1;
// clamp the distance between 0 and r
d = Math.min(Math.max(0, d), r);
// distance normalized [0, 1]
var t = d / r;
// final damage
var damage = D - t * D;

if you prefer a not linear damage you could convert t using one of the easing functions here:

for example:

var t = d / r;
t = easeInQuad(t);
1 Like
5

:scream_cat: :scream:

Can you make simple example? I’m very bad at math… :crazy_face:

I would be very grateful :blush:

6

I posted a full working code.
The only thing you need to do is to set the correct values of r, D and d.
And you will get the final damage.
Let me know what else you need more in details. What you can’t calculate?

7

then how is the calculation I seem to understand. I did not understand how to transfer this damage to a physical object. (Collision, rigbody)

But in any case, thank you! :wink:

8

I see, so you are speaking about forces, not just damage.
In any case, you can now take the “damage” calculated from the previous code, and use it to calculate a force vector.
I’m still new to PlayCanvas and I didn’t study the physics API yet, but in theory you need:

  1. the center of the sphere: c
  2. the position of the object that is hit: p

then you can calculate the force vector as:
f = (p - c) * damage
and use the PlayCanvas API to apply an instant force to your object.

1 Like