Passive/non-Dynamic rigid body via Haxe?

idomo · July 16, 2018, 4:23am

Hello,
I’m trying to generate procedural terrain, and part of that involves setting the mesh rigid body to passive/non-Dynamic via Haxe. I have tried rb.body.activate(false) as well as rb.setActivationState() to multiple values without results.
Is this possible to do currently via Haxe?
Here’s how I’m implementing my rigid body currently If it helps:

var rb = new armory.trait.physics.RigidBody();
object.addTrait(rb);
// Set as passive/non-Dynamic

Thanks

zicklag · November 29, 2018, 8:14pm

Just set the mass to 0 as the first parameter of the RigidBody trait’s constructor:

var rb = new armory.trait.physics.RigidBody(0);

That will make the object passive.

Quartz · May 4, 2020, 7:59pm

Sorry to necro this, but it seems that now armory.trait.physics.RigidBody has no parameters on it’s constructor, and if I try to use armory.trait.physics.bullet.RigidBody(0) the rigid body is still active, how would you do now to create a passive rigid body or to alter other rigid body parameters?

M_Ent8h · May 5, 2020, 11:46am

has no parameters on it’s constructor

Have you looked at the implementation of the class for Bullet?

github.com

armory3d/armory/blob/ede8a0f2d330c4b6ec6082d6f3829a58673da2a1/Sources/armory/trait/physics/bullet/RigidBody.hx#L77


      
          
          	static var CF_STATIC_OBJECT = 1;
          	static var CF_KINEMATIC_OBJECT = 2;
          	static var CF_NO_CONTACT_RESPONSE = 4;
          	static var CF_CHARACTER_OBJECT = 16;
          
          	static var convexHullCache = new Map<MeshData, bullet.Bt.ConvexHullShape>();
          	static var triangleMeshCache = new Map<MeshData, bullet.Bt.TriangleMesh>();
          	static var usersCache = new Map<MeshData, Int>();
          
          	public function new(shape = Shape.Box, mass = 1.0, friction = 0.5, restitution = 0.0, group = 1, mask = 1,
          						params: Array<Float> = null, flags: Array<Bool> = null) {
          		super();
          
          		if (nullvec) {
          			nullvec = false;
          			vec1 = new bullet.Bt.Vector3(0, 0, 0);
          			vec2 = new bullet.Bt.Vector3(0, 0, 0);
          			vec3 = new bullet.Bt.Vector3(0, 0, 0);
          			quat1 = new bullet.Bt.Quaternion(0, 0, 0, 0);
          			trans1 = new bullet.Bt.Transform();

Alternatively the oimo implementation too:

github.com

armory3d/oimo_module/blob/e2bba6a892b9b2f1d4a2f47d965e20e18d8fb860/Sources/armory/trait/physics/oimo/RigidBody.hx#L36


      
          
          	static var nextId = 0;
          	public var id = 0;
          
          	public var onReady:Void->Void = null;
          
          	static var v1 = new oimo.common.Vec3();
          	static var v2 = new oimo.common.Vec3();
          	static var q1 = new oimo.common.Quat();
          
          	public function new(shape = Shape.Box, mass = 1.0, friction = 0.5, restitution = 0.0, group = 1, mask = 1,
          						params: Array<Float> = null, flags: Array<Bool> = null) {
          		super();
          
          		this.shape = shape;
          		this.mass = mass;
          		this.friction = friction;
          		this.restitution = restitution;
          		// this.group = group;
          
          		if (params == null) params = [0.04, 0.1, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 0.0, 0.0, 0.0, 0.0];

Quartz · May 5, 2020, 4:14pm

Thanks, after looking at the code for Bullet I realized I just neededd to set the params and flags, I missed that before.