# Missing Havok Features **URL:** \ **Category:** Questions\ **Created:** [January 6, 2024, 11:50pm UTC](https://forum.babylonjs.com/t/missing-havok-features/47021 "2024-01-06T23:50:17Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![MackeyK24](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/mackeyk24/32/3741_2.png) [@MackeyK24](https://forum.babylonjs.com/u/MackeyK24)\ **Post date:** [January 6, 2024, 11:50pm UTC](https://forum.babylonjs.com/t/missing-havok-features/47021/1 "2024-01-06T23:50:18Z")
Yo @Cedric or any other Havok Gurus out there. I am trying to make the big switch from Ammo.JS to Havok for the Babylon Unity Exporter. I got most things working but really need some help with a few things. First and foremost… Terrain Heightfield… In Ammo.js i was directly setting the heights using a Float32Array of heights ```auto public static CreateHeightfieldTerrainShapeFromMesh(terrainMesh:BABYLON.Mesh, terrainWidth:number, terrainDepth:number, terrainMinHeight:number, terrainMaxHeight:number, terrainWidthExtents:number, terrainDepthExtents:number, flipQuadEdges:boolean = false):any { // This parameter is not really used, since we are using PHY_FLOAT height data type and hence it is ignored const heightScale = 1; // Up axis = 0 for X, 1 for Y, 2 for Z. Normally 1 = Y is used. const upAxis = 1; // hdt, height data type. "PHY_FLOAT" is used. Possible values are "PHY_FLOAT", "PHY_UCHAR", "PHY_SHORT" const hdt = "PHY_FLOAT"; // Create heightfield physics shape const heightData:FloatArray = terrainMesh.getVerticesData(BABYLON.VertexBuffer.PositionKind); // Creates height data buffer in Ammo heap (terrainMesh).ammoHeightData = Ammo._malloc(4 * terrainWidth * terrainDepth); let height = 0, p2 = 0; for (let i = 0; i < heightData.length / 3; i++) { height = heightData[i * 3 + 1]; // Note: Get The Y Component Only // .. // FIXME: Maybe Minus The Mesh Position Y To Offset Not A Zero Origin - ??? // .. Ammo.HEAPF32[(terrainMesh).ammoHeightData + p2 >> 2] = height; // 4 bytes/float p2 += 4; } // Creates the heightfield physics shape const heightFieldShape:any = new Ammo.btHeightfieldTerrainShape( terrainWidth, terrainDepth, (terrainMesh).ammoHeightData, heightScale, terrainMinHeight, terrainMaxHeight, upAxis, hdt, flipQuadEdges ); // Set horizontal scale const scaleX:number = terrainWidthExtents / (terrainWidth - 1); const scaleZ:number = terrainDepthExtents / (terrainDepth - 1); heightFieldShape.setLocalScaling( new Ammo.btVector3(scaleX, 1, scaleZ)); heightFieldShape.setMargin(BABYLON.SceneManager.DefaultHeightFieldMargin); return heightFieldShape; } ``` How do i use the raw Havok API to create a terrain heightfield shape ??? (@3th maybe you can help here) Second… How do I lock an axis from movement… In ammo i would use **setLinearFactor** and **setAngularFactor** … so for rotation i can use setAngularFactor(0,1,0) to lock a capsule upright to it would not tip over… you can only rotate around the Y axis Third… In Ammo… I was using **btKinematicCharacterController** as well as **btRaycastVehicle** with wheel collider support… Is there a character controller and raycast wheeled vehicle support in havok… It seems a bit strange that we **upgraded** to a more commercial physics but is does not seem to readily expose some of the basic physics engine stuff we had before in Ammo. - Kinematic Character Controllers - Raycast Wheel Vehicle Support - Terrain Height Field Shapes These are MAJOR issues for me and my Babylon Toolkit. Any light you guys can shed on these matter would be sweeeeeeet… Thank you so much 🙂 @Pryme8 … Andy what you think ??? ---
**Author:** ![Pryme8](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/pryme8/32/7212_2.png) [@Pryme8](https://forum.babylonjs.com/u/Pryme8)\ **Post date:** [January 7, 2024, 1:35am UTC](https://forum.babylonjs.com/t/missing-havok-features/47021/2 "2024-01-07T01:35:43Z")
I have not done much work with Havok yet and seem to struggle to find documentation on it whenever I google for it. There is this: > Not sure how much help for you that is though. I would assume you just need to make the terrain and then do something like this: ```auto const aggregate = new BABYLON.PhysicsAggregate(terrain, BABYLON.PhysicsShapeType.HEIGHTFIELD, { mass: 0, friction: 0.5, restitution: 0.5 }, scene); ``` ---
**Author:** ![MackeyK24](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/mackeyk24/32/3741_2.png) [@MackeyK24](https://forum.babylonjs.com/u/MackeyK24)\ **Post date:** [January 7, 2024, 10:27am UTC](https://forum.babylonjs.com/t/missing-havok-features/47021/3 "2024-01-07T10:27:42Z")
I got terrain height map collision working for my export terrain meshes. Not using a heightmap image, instead I create the Float32Array of heights directly from the terrain mesh exported from unity. No precision loss because of encoding the heights to 8 bit image. But i still need to get a alternative for Ammo.js **setLinearFactor** and **setAngularFactor** And how to handle **Kinematic Character Controllers** and **Raycast Wheeled Vehicles** ---
**Author:** ![Cedric](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/cedric/32/2742_2.png) [@Cedric](https://forum.babylonjs.com/u/Cedric)\ **Post date:** [January 8, 2024, 10:00am UTC](https://forum.babylonjs.com/t/missing-havok-features/47021/4 "2024-01-08T10:00:38Z")
I’m back from the break 🙂 Here is current state of Havok physics for your concern: Heightmap terrain shape is in progress. It should be merged by End of Feb, just before 7.0 code freeze you can do axis lock this way : [setAngularFactor for Havok - #3 by Takemura](https://forum.babylonjs.com/t/setangularfactor-for-havok/41954/3) No ETA for **Kinematic Character Controllers** and **Raycast Wheeled Vehicles** yet. It’s something we want to do for quite some time and as usual, prioritizes change. ---
**Author:** ![MackeyK24](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/mackeyk24/32/3741_2.png) [@MackeyK24](https://forum.babylonjs.com/u/MackeyK24)\ **Post date:** [January 8, 2024, 11:27am UTC](https://forum.babylonjs.com/t/missing-havok-features/47021/5 "2024-01-08T11:27:23Z")
> [@Cedric](#): > > you can do axis lock this way : [setAngularFactor for Havok - #3 by Takemura](https://forum.babylonjs.com/t/setangularfactor-for-havok/41954/3) What about setLinearFactor ? ---
**Author:** ![Cedric](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/cedric/32/2742_2.png) [@Cedric](https://forum.babylonjs.com/u/Cedric)\ **Post date:** [January 11, 2024, 4:48pm UTC](https://forum.babylonjs.com/t/missing-havok-features/47021/6 "2024-01-11T16:48:09Z")
@carolhmj Do you remember something related to setlinearfactor in Havok API? ---
**Author:** ![carolhmj](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/carolhmj/32/25918_2.png) [@carolhmj](https://forum.babylonjs.com/u/carolhmj)\ **Post date:** [January 11, 2024, 5:59pm UTC](https://forum.babylonjs.com/t/missing-havok-features/47021/7 "2024-01-11T17:59:35Z")
There is SetLinearDamping and SetLinearVelocity, but no SetLinearFactor 🤔 ---
**Author:** ![Cedric](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/cedric/32/2742_2.png) [@Cedric](https://forum.babylonjs.com/u/Cedric)\ **Post date:** [January 12, 2024, 2:12pm UTC](https://forum.babylonjs.com/t/missing-havok-features/47021/8 "2024-01-12T14:12:41Z")
with a damping of 1, it’s like setting a factor of 0, I guess. EDIT: nope. ---
**Author:** ![MackeyK24](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/mackeyk24/32/3741_2.png) [@MackeyK24](https://forum.babylonjs.com/u/MackeyK24)\ **Post date:** [January 12, 2024, 8:49pm UTC](https://forum.babylonjs.com/t/missing-havok-features/47021/9 "2024-01-12T20:49:24Z")
Yeah i tried that too… Its really to damping over time… Not like the multiply factor of SetLinearFactor … Luckily the mas properties inertia is multiplay against angular velocity so give me a way to freeze the rotation axis of the physics body as if havok had a setAngularFactor… But i still need to come up with a way to freeze the linear velocity as well ---
**Author:** ![MackeyK24](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/mackeyk24/32/3741_2.png) [@MackeyK24](https://forum.babylonjs.com/u/MackeyK24)\ **Post date:** [May 20, 2024, 10:57pm UTC](https://forum.babylonjs.com/t/missing-havok-features/47021/10 "2024-05-20T22:57:09Z")
Yo @Cedric and @carolhmj … Any idea when we are gonna expose vehicle classes for Havok Physics? ---
**Author:** ![Cedric](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/cedric/32/2742_2.png) [@Cedric](https://forum.babylonjs.com/u/Cedric)\ **Post date:** [May 21, 2024, 12:38pm UTC](https://forum.babylonjs.com/t/missing-havok-features/47021/11 "2024-05-21T12:38:23Z")
Hi @MackeyK24 Sorry, no ETA yet. We are working on planning ATM. Maybe I’ll have more to share 🙂