Dear community,
Question from a newbie here. I have made my first C++ Actor and added a Procedural Mesh to it (code dropped in below). If not the right forum, feel free to move.
I cannot drag a material onto the Material Element box, it looks a little dimmed compared to how it looks for the Cube Static Mesh. When I start dragging the area lights up with green dashed border, but when dropping the material on the box, or hovering over it, it doesn’t allow me to drop it. See video in link below. Can’t assign the material. What’s going on?
I notice a fine-grained checker-board pattern on top of the “normal” checker-board pattern, that I made 10x10, but I also see a 100x100 pattern, which I don’t see on the normal Cube Static Mesh. Is that any indication?
The cube to the left is made with a Procedural Mesh.
Here’s a video showing what happens when I try assigning a material.
[video]https://youtu.be/-HeW9vdhCiY[/video]
First code section, defining corners of each cube face, normals and tangents.
// Since we need unique normals and colors for each face,
// this is how we do it, repeating the vertices
static const FVector scUnitVerts[4*6] = {
// Front face
FVector(-1, -1, -1), // 0: Lower front left corner
FVector(-1, -1, 1), // 2: Upper front left corner
FVector(-1, 1, 1), // 3: Upper front right corner
FVector(-1, 1, -1), // 1: Lower front right corner
// Right face
FVector(-1, 1, -1), // 4: Lower front right corner
FVector(-1, 1, 1), // 6: Upper front right corner
FVector( 1, 1, 1), // 7: Upper back right corner
FVector( 1, 1, -1), // 5: Lower back right corner
// Back face
FVector( 1, 1, -1), // 8: Lower back right corner
FVector( 1, 1, 1), // 10: Upper back right corner
FVector( 1, -1, 1), // 11: Upper back left corner
FVector( 1, -1, -1), // 9: Lower back left corner
// Left face
FVector( 1, -1, -1), // 12: Lower back left corner
FVector( 1, -1, 1), // 14: Upper back left corner
FVector(-1, -1, 1), // 15: Upper front left corner
FVector(-1, -1, -1), // 13: Lower front left corner
// Top face
FVector(-1, -1, 1), // 16: Upper front left corner
FVector( 1, -1, 1), // 18: Upper back left corner
FVector( 1, 1, 1), // 19: Upper back right corner
FVector(-1, 1, 1), // 17: Upper front right corner
// Bottom face
FVector( 1, -1, -1), // 20: Lower back left corner
FVector(-1, -1, -1), // 22: Lower front left corner
FVector(-1, 1, -1), // 23: Lower front right corner
FVector( 1, 1, -1) // 21: Lower back right corner
};
static const FVector scFaceNormals[6] = {
FVector(-1, 0, 0), // Front face
FVector( 0, 1, 0), // Right face
FVector( 1, 0, 0), // Back face
FVector( 0, -1, 0), // Left face
FVector( 0, 0, 1), // Top face
FVector( 0, 0, -1) // Bottom face
};
static const FProcMeshTangent scFaceTangents[6] = {
FProcMeshTangent( 0, 1, 0), // Front face
FProcMeshTangent( 1, 0, 0), // Right face
FProcMeshTangent( 0, -1, 0), // Back face
FProcMeshTangent(-1, 0, 0), // Left face
FProcMeshTangent( 0, 1, 0), // Top face
FProcMeshTangent( 0, 1, 0) // Bottom face
};
Constructor code section
AMyDVRActor::AMyDVRActor()
{
PrimaryActorTick.bCanEverTick = true;
USphereComponent * SphereComponent = CreateDefaultSubobject<USphereComponent>(TEXT("RootComponent"));
RootComponent = SphereComponent;
UProceduralMeshComponent * mesh = CreateDefaultSubobject<UProceduralMeshComponent>(TEXT("BoundingBoxMesh"));
BuildBoundingBox(mesh, 0);
(void)mesh->SetupAttachment(RootComponent);
}
Actual code creating the mesh
void BuildBoundingBox(UProceduralMeshComponent * mesh, int meshSection)
{
// These should become input parameters in BP
FVector volSize(100.0, 100.0, 100.0);
FVector volOffset(0.0, 0.0, 0.0);
TArray<FVector> vertices;
TArray<int32> triangles;
TArray<FVector> normals;
TArray<FVector2D> uv;
TArray<FColor> colors;
TArray<FProcMeshTangent> tangents;
FVector halfSize = 0.5 * volSize;
FVector grey(0.5, 0.5, 0.5);
for (int face = 0; face < 6; face++)
{
const int idx = 4*face;
vertices.Add(scUnitVerts[idx + 0] * halfSize + volOffset);
vertices.Add(scUnitVerts[idx + 1] * halfSize + volOffset);
vertices.Add(scUnitVerts[idx + 2] * halfSize + volOffset);
vertices.Add(scUnitVerts[idx + 3] * halfSize + volOffset);
const FVector & faceNormal(scFaceNormals[face]);
const FProcMeshTangent & faceTangent(scFaceTangents[face]);
normals.Add(faceNormal);
normals.Add(faceNormal);
normals.Add(faceNormal);
normals.Add(faceNormal);
uv.Add(FVector2D(0, 0));
uv.Add(FVector2D(0, 10));
uv.Add(FVector2D(10, 10));
uv.Add(FVector2D(10, 0));
FColor faceColor(faceNormal[0] * 128 + 127,
faceNormal[1] * 128 + 127,
faceNormal[2] * 128 + 127);
colors.Add(faceColor);
colors.Add(faceColor);
colors.Add(faceColor);
colors.Add(faceColor);
tangents.Add(faceTangent);
tangents.Add(faceTangent);
tangents.Add(faceTangent);
tangents.Add(faceTangent);
// Configure the face with triangles.
triangles.Add(idx + 0);
triangles.Add(idx + 3);
triangles.Add(idx + 2);
triangles.Add(idx + 2);
triangles.Add(idx + 1);
triangles.Add(idx + 0);
}
mesh->CreateMeshSection(meshSection, vertices, triangles, normals, uv,
colors, tangents, false);
}
Thankful for any comment or idea that could help. Seems I am missing something.
cheers / Patric