void ABranchingLinesActor::GenerateMesh()
{
// -------------------------------------------------------
// Setup the random number generator and create the branching structure
RngStream = FRandomStream::FRandomStream(RandomSeed);
CreateSegments();
// The number of vertices or polygons wont change at runtime, so we'll just allocate the arrays once
if (!bHaveBuffersBeenInitialized)
{
SetupMeshBuffers();
bHaveBuffersBeenInitialized = true;
}
// -------------------------------------------------------
// Now lets loop through all the defined segments and create a cylinder for each
int32 VertexIndex = 0;
int32 TriangleIndex = 0;
for (int32 i = 0; i < Segments.Num(); i++)
{
GenerateCylinder(Vertices, Triangles, Segments[i].Start, Segments[i].End, Segments[i].Width, RadialSegmentCount, VertexIndex, TriangleIndex, bSmoothNormals);
}
MeshComponent->ClearAllMeshSections();
MeshComponent->CreateMeshSection(0, Vertices, Triangles, GetBounds(), false, EUpdateFrequency::Infrequent);
MeshComponent->SetMaterial(0, Material);
}
void Ass3::BuildGeometryBuffers()
{
//create mesh object
GeometryGenerator::MeshData myMesh;
GenerateCylinder(myMesh, sliceCount, cylinderRadius, cylinderHeight, 0.0f);
vertexCount = myMesh.Vertices.size();
//set vertex settings
std::vector<Vertex> vertices(vertexCount);
UINT k = 0;
for (size_t i = 0; i < vertexCount; ++i, ++k)
{
vertices[k].Pos = myMesh.Vertices[i].Position;
vertices[k].Color = XMFLOAT4((i/(float)vertexCount), (i / (float)vertexCount), (i / (float)vertexCount), 1.0f);
}
//apply vertices
D3D11_BUFFER_DESC vbd;
vbd.Usage = D3D11_USAGE_DYNAMIC;
vbd.ByteWidth = sizeof(Vertex) * vertexCount;
vbd.BindFlags = D3D11_BIND_VERTEX_BUFFER;
vbd.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
vbd.MiscFlags = 0;
D3D11_SUBRESOURCE_DATA vinitData;
vinitData.pSysMem = &vertices[0];
HR(md3dDevice->CreateBuffer(&vbd, &vinitData, &mBoxVB));
//create indices
std::vector<UINT> indices;
indices.insert(indices.end(), myMesh.Indices.begin(), myMesh.Indices.end());
indexCount = myMesh.Indices.size();
//apply indices
D3D11_BUFFER_DESC ibd;
ibd.Usage = D3D11_USAGE_IMMUTABLE;
ibd.ByteWidth = sizeof(UINT) * indexCount;
ibd.BindFlags = D3D11_BIND_INDEX_BUFFER;
ibd.CPUAccessFlags = 0;
ibd.MiscFlags = 0;
ibd.StructureByteStride = 0;
D3D11_SUBRESOURCE_DATA iinitData;
iinitData.pSysMem = &indices[0];
HR(md3dDevice->CreateBuffer(&ibd, &iinitData, &mBoxIB));
}
void ASimpleCylinderActor::GenerateMesh()
{
if (Height <= 0)
{
MeshComponent->ClearAllMeshSections();
return;
}
// The number of vertices or polygons wont change at runtime, so we'll just allocate the arrays once
if (!bHaveBuffersBeenInitialized)
{
SetupMeshBuffers();
bHaveBuffersBeenInitialized = true;
}
FBox BoundingBox = FBox(FVector(-Radius, -Radius, 0), FVector(Radius, Radius, Height));
GenerateCylinder(Vertices, Triangles, Height, Radius, RadialSegmentCount, bCapEnds, bDoubleSided, bSmoothNormals);
MeshComponent->ClearAllMeshSections();
MeshComponent->CreateMeshSection(0, Vertices, Triangles, BoundingBox, false, EUpdateFrequency::Infrequent);
MeshComponent->SetMaterial(0, Material);
}
