Method BuildVertexBuffer

source/common/models/models_obj.cpp:360–439

* Construct the vertex buffer for this model * * @param renderer A pointer to the model renderer. Used to allocate the vertex buffer. */

 * @param renderer A pointer to the model renderer. Used to allocate the vertex buffer.
 */
void FOBJModel::BuildVertexBuffer(FModelRenderer *renderer)
{
	if (GetVertexBuffer(renderer->GetType()))
	{
		return;
	}

	unsigned int vbufsize = 0;

	for (size_t i = 0; i < surfaces.Size(); i++)
	{
		ConstructSurfaceTris(surfaces[i]);
		surfaces[i].vbStart = vbufsize;
		vbufsize += surfaces[i].numTris * 3;
	}
	// Initialize/populate vertFaces
	if (hasMissingNormals && hasSmoothGroups)
	{
		AddVertFaces();
	}

	auto vbuf = renderer->CreateVertexBuffer(false,true);
	SetVertexBuffer(renderer->GetType(), vbuf);

	FModelVertex *vertptr = vbuf->LockVertexBuffer(vbufsize);

	for (unsigned int i = 0; i < surfaces.Size(); i++)
	{
		for (unsigned int j = 0; j < surfaces[i].numTris; j++)
		{
			for (size_t side = 0; side < 3; side++)
			{
				FModelVertex *mdv = vertptr +
					side + j * 3 + // Current surface and previous triangles
					surfaces[i].vbStart; // Previous surfaces

				OBJFaceSide &curSide = surfaces[i].tris[j].sides[2 - side];

				int vidx = curSide.vertref;
				int uvidx = (curSide.uvref >= 0 && (unsigned int)curSide.uvref < uvs.Size()) ? curSide.uvref : 0;
				int nidx = curSide.normref;

				FVector3 curVvec = RealignVector(verts[vidx]);
				FVector2 curUvec = FixUV(uvs[uvidx]);
				FVector3 nvec;

				mdv->Set(curVvec.X, curVvec.Y, curVvec.Z, curUvec.X, curUvec.Y);

				if (nidx >= 0 && (unsigned int)nidx < norms.Size())
				{
					nvec = RealignVector(norms[nidx]);
				}
				else
				{
					if (surfaces[i].tris[j].smoothGroup == 0)
					{
						nvec = CalculateNormalFlat(i, j);
					}