PlayCanvas physics extension

Useful Resources
21

I dont know how to reproduce the error it happens very randomly sometimes when I launch the project and then the physics do not work. When I re-launch (refresh) it works again. Its very hard to reproduce it but it does happen sometimes.

I took a screenshot of the error when it happened.

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project link

It happens usually when I load the project in the editor for the first time and launch it

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Hmm, that is a strange error which I have not encountered previously. Itā€™s not related to the extension but something with regard to loading Ammo. Iā€™ve made a new Ammo build with the latest version. Please get it from the extension project and try again:

https://playcanvas.com/project/695416/overview/convex-cast-collision-detection

1 Like
24

I used the new Ammo build, the same thing happens but this time with this error message:

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current version of project doesnā€™t work

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Thank you for reporting. If you could describe the steps how to reproduce the error, I could take a look. Probably early next week at earliest, though.

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I just clicked ā€œLaunchā€ in editor, nothing more

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The current version of Ammo that PlayCanvas is using is not recent enough for this to work. Until the team updates it, you can grab a newer Ammo version from my example project.

Is there any timeline for when the PlayCanvas team is planning to update the ammo version shipped with the engine?

We think this is really useful and would love to have it work without having to replace the ammo version manually.

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We havenā€™t yet no as we donā€™t have any features upcoming that would require us to update the version.

Is there something specific in new versions of Ammo that you would need/want?

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Is there something specific in new versions of Ammo that you would need/want?

The method get_m_hitCollisionObject on the Ammo.ClosestConvexResultCallback is missing in the current version shipped with PC, which is required for the physics extensions of this thread.

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One thing that bullet3 also solves is capsule colliders following through large mesh colliders (e.g. terrains).

Right now that happens quite easily.

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Hmm, I can create a ticket to investigate an upgrade but honestly, it wouldnā€™t be high on the priority list unfortunately

3 Likes
33

Yo this would work elegantly for a parrying system. I wanna make it now

35

Hey I was having an issue where the sphere raycasting just feltā€¦off? like you would have to aim slightly above the sphere you get it to register, and it would register only when the sphere hits you, I have tried other shapes yet I was wondering if I did something wrong or not.

https://playcanvas.com/project/1195880/overview/ant-game-thing

Scripts:
helpfulPlayer

Edit:

Fixed I just had to put this as the pixelratio:

var screenCenterX = (this.app.graphicsDevice.width / 2) / window.devicePixelRatio;
var screenCenterY = (this.app.graphicsDevice.height / 2) / window.devicePixelRatio;

36

Iā€™ve created v2.0 of convex-cast.js. The current version does not parse in the current version of PlayCanvas.

Note that you still need to use the version of Ammo.js provided by the example project above. The included version of Ammo.js with PlayCanvas 2.9.2 does not have get_m_hitCollisionObject() function on ClosestConvexResultCallback().

Changelog:

  • Initialize cache upon first use, not during parse
  • Fix typo where setRotation was being called on incorrect transform variable.
4 Likes
37

Thank you, @tatelax ! I have updated the original project with your contribution.

@KPal do you know the current version of Ammo in Editor? I was under the impression it was updated last year? Iā€™ve added the convex cast methods to Ammo 5 years ago, so I was under impression the current version should work.

Edit: Iā€™ve just checked the Ammo variant in Editor, and those methods are missing indeed. The current version should be at least 5 years old then.

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Which is interesting because according to this issue, the ammo version in editor was updated last year: Update the version of Ammo in Editor Ā· Issue #934 Ā· playcanvas/editor Ā· GitHub

So something must have regressed or it was not actually updated.

1 Like