Question

Create an oriented bounding box from vertices

Asked by: Snapples

Hi there,

I'm doing this in XNA but it shouldn't be too different in DirectX
I'm getting the vertices of a box mesh from the vertexbuffer, now from those vertices I'd need to recreate that box as an oriented bounding box.
This is my code, in transformedvertices my vertices are stored in world space, a total of 24, now I'd need to be able to turn that into an oriented bounding box.
Anyone have any ideas?

Thanks in advance.

ModelMeshPart part = modelmesh.MeshParts[j];
                n = part.NumVertices;
 
                VertexPosition[] vertices = new VertexPosition[part.NumVertices];
 
                modelmesh.VertexBuffer.GetData<VertexPosition>(part.BaseVertex * part.VertexStride, vertices, 0, part.NumVertices, part.VertexStride);
 
                int t = MySkinnedModel.SkeletonBones.Count;
                string[] names = new string [t];
 
                for (int p = 0; p < t; p++)
                { 
                    names[p] = MySkinnedModel.SkeletonBones[p].Name.ToString();
                }
 
                Vector3[] transformedvertices = new Vector3[(part.NumVertices)];
 
                Matrix transformmatrix = MyAnimationController.SkinnedBoneTransforms[0];
 
                for (int i = 0; i < part.NumVertices; i++)
                {
                    transformedvertices[i] = Vector3.Transform(vertices[i].Position, transformmatrix);
                }

                                  
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Asked On
2009-05-04 at 10:05:22ID24378568
Tags

xna directx vertices

Topics

DirectX Graphics & Game Programming

,

C# Programming Language

,

Microsoft Visual C#.Net

Participating Experts
1
Points
500
Comments
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Answers

 

by: ikeworkPosted on 2009-05-05 at 01:14:57ID: 24302428

hi Snapples,

this might be interesting for you:

http://codesuppository.blogspot.com/2006/06/best-fit-oriented-bounding-box.html

another technique is to compute a covariance-matrix of the point-cloud to compute the bounding box.

ike

 

by: SnapplesPosted on 2009-05-07 at 06:33:04ID: 24325501

Thanks for the link, I hadn't seen that one yet. Unfortunately it's of no use to me, I should have mentioned this. The bounding box surrounds part of an animated mesh, so the box has to be updated every frame. The code in your link is too performance heavy to run every single frame.

 

by: ikeworkPosted on 2009-05-07 at 07:57:26ID: 24326621

ok i see .. did you try the covariance-matrix yet?

 

by: SnapplesPosted on 2009-05-10 at 02:48:23ID: 24347474

I found the solution I needed.

In my OBB class, I have a global Vector3[24] array, in the constructor I fill it with the VertexBuffer of my mesh. I also have an Edge and a Quad struct, which has 2 and 4 short values in which I store the IndexBuffer values of the edges and faces. So basically storing every vertex, edge, face and quad with a minimum of data. Every frame I just have to transform the Vector3 array with the transformation matrix of the bone.
Then to check for collision I check if any of the edges of box1 collide with any faces of box2.

But thank you ike, I did get a lot of help from that first link you posted.

 

by: ikeworkPosted on 2009-05-10 at 06:32:43ID: 24348308

great to hear that .. good luck .. :)

20120131-EE-VQP-002

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