Domino Effect

Question

I'm making a 2D game prototype and I like to make a domino effect using the physics engine. I'm using AddForceAtPosition but I'm not sure if the parameters are correct cause I cannot get the domino effect I want.

alt text

 void FixedUpdate() {
     if (Input.GetButtonDown("Fire1")) {
         domino.rigidbody.AddForceAtPosition(domino.transform.right * 30.0f, domino.transform.position + new Vector3(0, 5.0f, 0));
     }
 }

Rigidbody

 Mass 0.08
 Drag 0
 Angular Drag 0.05
 Use Gravity Yes
 Is Kinematic No
 Freeze Position Z
 Freeze Rotation X, Y

If freeze position Y, I get a better effect (although I want something better than that) but don't apply gravity.

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Thanks for the help

Answer 1

Best Answer

Answer by sed · Oct 09, 2013 at 10:17 AM

Maybe you could get away with just making the blocks thinner?

Set the proportion between height and width to something more like in real domino blocks, and you will see less 'stabilization' after being pushed.

Consider a real world situation: trying to force a cube 1x1x1 (a gaming dice any1?) to fall - it probably won't work as easily as real domino piece.

A real domino piece is more like 1x5x10.

What's more the suggestion from the other answer about switching center of mass makes a lot of sense but it won't help much until you make proportions adequate.

When making physics simulations always try to make sure your Render part is as closely representative to the Simulation part as possible. Then you will be able to 'just see' most of the problems :)

It doesn't matter if you are in 2D or 3D - drawing the simulation accurately helps you 'just see' whats happening.

Side note: You may want to put some thought into the physics to drawing ratio in your game and keep it consistent everywhere. If you simulate block 1x10 as 8pixels x 80 pixels try to keep 1:8 scale in the whole game - this will make your life easier when adding interactions between different elements.

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xCharlie · Oct 10, 2013 at 09:32 AM 0

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It makes sense that the proportion affects. Right now the size is 1x1x1 and I'm using 16x32 sprites with 2D Toolkit but don't know if that affects anything...

sed · Oct 10, 2013 at 09:43 AM 0

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Add the part about the difference in proportions in simulation vs rendering. It will be more helpful for future readers. This is the apparent problem in your situation :)

xCharlie · Oct 10, 2013 at 11:01 AM 0

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Ok, now I understand it, thanks. But if I'm working in 2D, is there any difference?

sed · Oct 10, 2013 at 11:18 AM 0

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Well, I believe the situation stays the same, it doesn't matter if u r in 2D or 3D, drawing the situation accurately makes it easier to 'debug it by looking how it behaves'. You probably want to draw the 'thin side' of those blocks. So draw them as 8x80 sprites, and you should be ok :)

Answer 2

Answer by venusboysatish · Oct 09, 2013 at 08:43 AM

do this: increase the y position of ceter of mass of the rigidbody so that they will fall easier. domino. rigidbody.centerOfMass = new Vector3(0f, 0.25f, 0f);

PS: i had made similar game. https://www.facebook.com/TheDomingos

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xCharlie · Oct 10, 2013 at 09:31 AM 0

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I'm not sure but I don't notice difference using centerOf$$anonymous$$ass. $$anonymous$$aybe there's something to change in Physics $$anonymous$$anager?

Domino Effect

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