Runtime Mesh Component

Distribution UE Marketplace
,
189

In case anyone needs it, I managed to create the sphere, here’s the code (I’m actually using the ProceduralMeshComponent in this one, but the code stays basically the same):



void ASphereActor::GenerateSphereMesh()
{
	mVertices.Empty();
	mIndices.Empty();
	mNormals.Empty();
	mUvs.Empty();
	mVertexColors.Empty();
	mTangents.Empty();

	CreateSphereWithTriangles(mVertices, mIndices, mNormals, SphereRadius, SphereRings, SphereSectors);

	mMesh->CreateMeshSection(0, mVertices, mIndices, mNormals, mUvs, mVertexColors, mTangents, false);
}

void ASphereActor::CreateSphereWithTriangles(TArray<FVector> &vertices, TArray<int32> &indices, TArray<FVector> &normals, float radius, int stacks, int slices)
{
	double stackAngle = PI / stacks;
	double sliceAngle = 2.0 * PI / slices;

	int i, j, v1_index, v2_index, v3_index;

	double a = 0;
	double b = a + stackAngle;
	double r0 = radius * sin(a);
	double r1 = radius * sin(b);
	float z0 = radius * cos(a);
	float z1 = radius * cos(b);

	double c = 0;
	float x = cos(c);
	float y = sin(c);

	vertices.Add(FVector(x * r0, y * r0, z0));
	v1_index = vertices.Num();

	vertices.Add(FVector(x * r1, y * r1, z1));
	v2_index = vertices.Num();

	for (i = 0; i < stacks; i++)
	{
		a = i * stackAngle;
		b = a + stackAngle;
		r0 = radius * sin(a);
		r1 = radius * sin(b);
		z0 = radius * cos(a);
		z1 = radius * cos(b);

		j = i ? 0 : 1;

		for (; j <= slices; j++) 
                {
			c = j * sliceAngle;
			x = cos(c);
			y = sin(c);

			vertices.Add(FVector(x * r0, y * r0, z0));
			v3_index = vertices.Num();

			indices.Add(v1_index);
			indices.Add(v2_index);
			indices.Add(v3_index);

			v1_index = v3_index;

			vertices.Add(FVector(x * r1, y * r1, z1));
			v3_index = vertices.Num();

			indices.Add(v1_index);
			indices.Add(v2_index);
			indices.Add(v3_index);

			v2_index = v3_index;
		}
	}
}

It’s not the prettiest code but it works:
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