Collision detection with .mdl

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#1

Hi, I’m new on urho3D, I created a simple plane jointed with 4 cylinder on blender and I imported it on an urho3D project but I don’t understand how to correctly use the collision detection with a .mdl who is not a simple cube, a cylinder etc …

I thanks per advance if somebody can help me or give me the right example or documentation.

#2

For dynamic objects you can use the CollisionShape::SetConvexHull method. Static objects can also use triangle meshes as shape through CollisionShape::SetTriangleMesh.
Both functions ask for a Model* which you can acquire by invoking:
GetSubsystem<ResourceCache>()->GetResource<Model>("...")

And welcome to the forums! :confetti_ball:

#3

Thank you for the fast response ! Now It works better but it’s not totally right.

Here is my code :

Node* TempleNode = scene_->CreateChild(“Temple”);
TempleNode->SetPosition(Vector3(0.0f, 6.0f, 3.0f));
TempleNode->SetScale(Vector3(1.0f, 1.0f, 1.0f));
StaticModel* TempleObject = TempleNode->CreateComponent();
TempleObject->SetModel(cache->GetResource(“temple/temple.mdl”));

body = TempleNode->CreateComponent();
body->SetMass(10.0f);

Model* TempleModel = GetSubsystem()->GetResource(“temple/temple.mdl”);

CollisionShape* Templeshape = TempleNode->CreateComponent();

Templeshape->SetConvexHull(TempleModel);

and here is a screenshot of the result : https://imgur.com/dedDUMu

#4

Static objects in Bullet have a mass of 0. Also you used the convex hull instead of the triangle mesh.

A definition of convex: "Curved or rounded outward like the exterior of a sphere or circle."
Your temple model is not fully convex. :slight_smile:

#5

Thank you very much! It works well with theTriangle Mesh instead of the Convex Hull and without body->SetMass(10.0f).

PS : I’m not just new with urho3D I’m also new with 3D programming.

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