Physics angular velocity damage problem

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- maxwell88
- - Joined 4 May, 2015
  - 60 topics • 141 posts
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- 19 Jun, 2018
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hello, i have problem with dealing damage, im using Physics behaviors

Cannon ball and bricks

When cannon ball have collision with bricks i substract from Brick HP Ball.physics.angularVelocity & Ball.Physics.density

And this do not substract.

I check in inspector and HP are growing!
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- dop2000
- - Joined 26 May, 2016
  - 133 topics • 12,072 posts
- 1
- 19 Jun, 2018
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Angular velocity value can be negative, add abs() expression.
- maxwell88
- - Joined 4 May, 2015
  - 60 topics • 141 posts
- 1
- 19 Jun, 2018
- Quote
Angular velocity value can be negative, add abs() expression.

"abs(BALL.Physics.AngularVelocity) & BALL.Physics.Density"

when i add abs expression, event substract always 1 from hp
- R0J0hound
- - Joined 15 Jun, 2009
  - 90 topics • 7,087 posts
- 1
- 19 Jun, 2018
- Quote
That’s because & is an “and” operator. If both numbers are non-zero then the result is 1.

You probably want to add the numbers together or something.
- maxwell88
- - Joined 4 May, 2015
  - 60 topics • 141 posts
- 1
- 19 Jun, 2018
- Quote
That’s because & is an “and” operator. If both numbers are non-zero then the result is 1.

You probably want to add the numbers together or something.

Yes, speed of ball and his density should sum and substract from brick hp
- R0J0hound
- - Joined 15 Jun, 2009
  - 90 topics • 7,087 posts
- 1
- 20 Jun, 2018
- Quote
So you’ll want to use + instead of & to add them together.
- maxwell88
- - Joined 4 May, 2015
  - 60 topics • 141 posts
- 1
- 20 Jun, 2018
- Quote
So you’ll want to use + instead of & to add them together.

i use this

abs(BALL.Physics.AngularVelocity) + BALL.Physics.Density

also dont work correctly
- dop2000
- - Joined 26 May, 2016
  - 133 topics • 12,072 posts
- 1
- 20 Jun, 2018
- Quote
What exactly are you trying to achieve?

Angular velocity is the speed of rotation. And density is basically mass of the object. Adding them together makes little sense.

I'm guessing you need normal (linear) velocity. You can use VelocityX if your ball is moving horizontally, or this expression to get its overall velocity:

distance(0, 0, Ball.Physics.VelocityX, VelocityY)

Also, you should probably multiply velocity and density together, not add them.

.

Add a text object to your layout and print the result of this formula to see what numbers it's generating.