JulioJerez
commented
3 years ago 12k vertices is a very small vertex load. My guess is that there are many overlapping faces.
If I understand correctly, the vowel mesh is made of regular size cubes. When two of more cubes are adjacent this will make two or more quad to face each other.
This is very bad for the collision mesh generator, because it assume the input mesh is a clean manifold, this means each edge can only be shared by one or two faces. Whe the mesh generator detect edge with more than rwo faces, it try to separate the mesh separate set. But it does not expect to be the rule, it expect that to be the exception, like a bug in the mesh. This is because separating non manifold meshes into a set of manifold meshes is a nonpolynomial time complexity algorithm.
The are few things you could do.
1- write the algorithm in a way that those opposing face are skipped. That should not be too difficult.
2-since this is a vowel, you probably want to general the collision in real time. For special effects like destruction or that kind of thing.
The is in the engine a file for generation similar king of meshes, marching cube, that I was going to use for that, but I found that I would have to put lot of time on visualization, so in end up just doing the static height field.
This is what I can do. I can add A new demo the generate a real time mesh, that is an infinite grid.
Them there you can see what methos has to be whiten and you can use that to implement you vowel call. Basically you subclass fro the static mesh and you find those function that are call by the contact solver Does that sound reasonably.?
On Thu, Aug 12, 2021, 2:02 AM Sam @.***> wrote:
Hi, I have created mesh collider for my voxel mesh with around 12k vertices and it takes 24ms at minumum when generating.
This is my code:
dMatrix chunkMatrix(dGetIdentityMatrix()); chunkMatrix.m_posit = dVector((float)data.ChunkPos.x 16.0f, (float)data.ChunkPos.y 16.0f, (float)data.ChunkPos.z * 16.0f, 0.0f);
if(auto specialVoxelMesh = dynamic_cast<SpecialVoxelMesh>(mesh.get())) { dPolygonSoupBuilder meshBuilder; meshBuilder.Begin(); dVector face[3];
const auto& indexBuffer = specialVoxelMesh->GetIndexBuffer(0); VertexBuffer
* voxelBuffer = specialVoxelMesh->GetVertexBuffer(0); for (int i = 0; i < indexBuffer.size() / 3; ++i) { auto i0 = indexBuffer[i 3 + 0]; auto i1 = indexBuffer[i 3 + 1]; auto i2 = indexBuffer[i * 3 + 2];
const SpecialVoxelMeshVertexBufferEntry& v0 = voxelBuffer->Get(i0); const SpecialVoxelMeshVertexBufferEntry& v1 = voxelBuffer->Get(i1); const SpecialVoxelMeshVertexBufferEntry& v2 = voxelBuffer->Get(i2); face[0].m_x = v0.Position.x; face[0].m_y = v0.Position.y; face[0].m_z = v0.Position.z; face[1].m_x = v1.Position.x; face[1].m_y = v1.Position.y; face[1].m_z = v1.Position.z; face[2].m_x = v2.Position.x; face[2].m_y = v2.Position.y; face[2].m_z = v2.Position.z; meshBuilder.AddFace(&face[0].m_x, sizeof(dVector), 3, 0);}
meshBuilder.End(false);
ndShapeInstance staticMeshInstance(new ndShapeStatic_bvh(meshBuilder));
subObject->PhysicsBody = new ndBodyDynamic(); //body->SetNotifyCallback(new ndDemoEntityNotify(scene, entity)); subObject->PhysicsBody->SetMatrix(chunkMatrix); subObject->PhysicsBody->SetCollisionShape(staticMeshInstance); AuroraEngine::Physics->AddBody(subObject->PhysicsBody); }
The lag happens when calling meshBuilder.End(false);.
My suspicion is that I'm doing something wrong, I could not find many examples on mesh colliders, could you please help me ? Thanks.
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SamCZ
Compaund of AABB's ? I want players to stand on the branches.
Hi, I have created mesh collider for my voxel mesh with around 12k vertices and it takes 24ms at minumum when generating.
This is my code:
The lag happens when calling
meshBuilder.End(false);.My suspicion is that I'm doing something wrong, I could not find many examples on mesh colliders, could you please help me ? Thanks.