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 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);
}
void ASimpleCylinderActor::PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent)
{
Super::PostEditChangeProperty(PropertyChangedEvent);
FName MemberPropertyChanged = (PropertyChangedEvent.MemberProperty ? PropertyChangedEvent.MemberProperty->GetFName() : NAME_None);
if ((MemberPropertyChanged == GET_MEMBER_NAME_CHECKED(ASimpleCylinderActor, Radius)) || (MemberPropertyChanged == GET_MEMBER_NAME_CHECKED(ASimpleCylinderActor, Height)) || (MemberPropertyChanged == GET_MEMBER_NAME_CHECKED(ASimpleCylinderActor, bSmoothNormals)))
{
// Same vert count, so just regen mesh with same buffers
GenerateMesh();
}
else if ((MemberPropertyChanged == GET_MEMBER_NAME_CHECKED(ASimpleCylinderActor, RadialSegmentCount)) || (MemberPropertyChanged == GET_MEMBER_NAME_CHECKED(ASimpleCylinderActor, bCapEnds)) || (MemberPropertyChanged == GET_MEMBER_NAME_CHECKED(ASimpleCylinderActor, bDoubleSided)))
{
// Vertice count has changed, so reset buffer and then regen mesh
Vertices.Empty();
Triangles.Empty();
SetupMeshBuffers();
GenerateMesh();
}
else if ((MemberPropertyChanged == GET_MEMBER_NAME_CHECKED(ASimpleCylinderActor, Material)))
{
MeshComponent->SetMaterial(0, Material);
}
}
