Real-Time Physics Simulation Forum 2022-01-07T21:06:04+00:00 https://pybullet.org/Bullet/phpBB3/app.php/feed/topic/13350 2022-01-07T21:06:04+00:00 2022-01-07T21:06:04+00:00 https://pybullet.org/Bullet/phpBB3/viewtopic.php?p=43793#p43793 <![CDATA[Re: bvhTriangleMesh glitch]]> Statistics: Posted by Alastar — Fri Jan 07, 2022 9:06 pm

]]> 2022-01-07T20:04:47+00:00 2022-01-07T20:04:47+00:00 https://pybullet.org/Bullet/phpBB3/viewtopic.php?p=43792#p43792 <![CDATA[bvhTriangleMesh glitch]]> bvhTriangleMesh manually, and I also get some game models (as .obj) for game objects on scene and passed verts and tris to bvhTriangleMesh.
I've used demo application from github to vizualise physics world and get strange behaviour:
1) Manually generated terrain mesh looks fine, except strange alignment (looks like it's up axis is X or Z, not Y) and application renders it fine;
2) Game models looks totally messed and unrecognizable;
Both terrain and game objects meshes use same rendering code, there's no mistake in models itself, I've checked them with Noesis viewer. This also can't be bullet wrapper problem because terrain looks ok.
What am I doing wrong?
Снимок.JPG
I'm using latest BulletSharp from github (CSharp wrapper)
Creation of game objects in code (C#):

Code: 

            foreach (int key in FixtureInfos.Keys)            {                FixtureInfo info = FixtureInfos[key]; //getting info about game model                //safe checks                if (!ModelInfos.ContainsKey(info.NifID))                {                    Console.WriteLine($"Missing fixture info: {info.NifID} - {info.Name} in {path}");                    continue;                }                if (!BulletOcclusion.Fixtures.ContainsKey(ModelInfos[info.NifID].ModelName))                {                    Console.WriteLine($"Missing model: {ModelInfos[info.NifID].ModelName}");                    continue;                }                //                //creating bvh from pre loaded model                BvhTriangleMeshShape shape = BulletOcclusion.Fixtures[ModelInfos[info.NifID].ModelName];//translating it and rotating                Matrix startTransform = Matrix.Translation(new BulletSharp.Vector3( //translation                        (float)info.X,                        (float)info.Y,                        (float)info.Z                    ));                startTransform = Matrix.Add(startTransform, Matrix.RotationQuaternion(BulletSharp.Quaternion.RotationAxis(new BulletSharp.Vector3((float)info.XAxis, (float)info.YAxis, (float)info.ZAxis), info.Angle3D)));                //creating rigidbody itself                myMotionState = new DefaultMotionState(startTransform);                rbInfo = new RigidBodyConstructionInfo(0.0f, myMotionState, shape);                rigid = new FixtureRigidBody(rbInfo, info.ID, info.NifID, info.Name);                rigid.CollisionFlags |= CollisionFlags.StaticObject;                AddRigidBody(rigid);                rbInfo.Dispose();            }            FixtureInfos.Clear();
Reading models and creating collision shapes for them:

Code: 

ObjModel model = new ObjModel();        model.Deserialize(bytes);        if (model.Vertices.Length > 0 && model.Polygons.Length > 0)        {        TriangleIndexVertexArray indexVertexArray = new TriangleIndexVertexArray(model.Polygons, model.Vertices);        BvhTriangleMeshShape shape = new BvhTriangleMeshShape(indexVertexArray, true, true);        Fixtures.TryAdd(name, shape);        Console.WriteLine($"Loaded model: {name}");        }        else        {        Console.WriteLine($"Model {name} has no faces or polygons!");        }

Statistics: Posted by Alastar — Fri Jan 07, 2022 8:04 pm

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