移植DXUT SDKMesh以导入OBJ文件，在哪里添加纹理坐标和索引
Porting DXUT SDKMesh to import OBJ files, where to add texture coordinates and indices?
下午好，
我已经成功地通过TinyOBJ加载器移植了DXUT SDKMesh来加载导入的obj文件https://github.com/syoyo/tinyobjloader)以使用正确的索引值绘制网格。
我还添加了一个纹理，作为DDS材料加载
它当前绘制网格，但整个纹理在每个三角形上拉伸
我现在需要弄清楚在哪里添加纹理坐标，以及这些纹理坐标的索引。
该代码由DXUT SDKMeshCDXUTSDKMesh::CreateFromMemory函数重构而成。SDKMesh代码是一个相当大的文件，但可以在这里找到它以供参考http://freesourcecode.net/cprojects/92957/sourcecode/SDKmesh.cpp
如您所见，我正在使用InitData.pSysMem = &vertex_buffer[0];加载顶点列表
以及使用InitData2.pSysMem = &index_buffer[0];的索引列表
DXUT SDKMesh对二进制.sdkesh文件执行相同的操作我同时加载DXUT示例模型tiny.sdkmesh。它们都使用相同的着色器和渲染函数进行渲染。所以我知道问题不在于渲染函数，而在于我构造顶点和索引缓冲区的方式。
我需要知道的是这些顶点和索引缓冲区是如何构造的。和我知道这是由顶点着色器决定的，尽管我不知道怎么做。
顶点着色器具有以下输入和输出：
struct VS_INPUT
{
float4 vPosition : POSITION;
float3 vNormal : NORMAL;
float2 vTexcoord : TEXCOORD0;
};
struct VS_OUTPUT
{
float3 vNormal : NORMAL;
float2 vTexcoord : TEXCOORD0;
float4 vPosition : SV_POSITION;
};
如果我保持对值的评论，就像现在一样，它是有效的。如果我加上它们，就会破坏模型。
我不明白的是如何将顶点和texcords分组到一个缓冲区中，并将vertex_index和texcORD_index分组到另一个缓冲区时。以及如何将其分解并加载为顶点着色器输入。(如果以这种方式使用(。
我试着依次添加它们，一个接一个，等等，在每种情况下都会破坏模型。
如果您对如何正确地将这些内容组合在一起有任何建议或教育，我们将不胜感激。谢谢你，
//Need to sort indices and vertices from TinyOBJ loader
std::vector<float> vertex_buffer;
for (int i = 0; i < num_vertices/3; i++)
{
vertex_buffer.push_back(attrib.vertices[i * 3 + 0]);
vertex_buffer.push_back(attrib.vertices[i * 3 + 1]);
vertex_buffer.push_back(attrib.vertices[i * 3 + 2]);
//vertex_buffer.push_back(attrib.texcoords[i * 2 + 0]);
//vertex_buffer.push_back(attrib.texcoords[i * 2 + 1]);
//vertex_buffer.push_back(0);
}
std::vector<UINT> index_buffer;
for (int i = 0; i < num_indices/3; i++)
{
index_buffer.push_back(shapes[0].mesh.indices[i * 3 + 0].vertex_index);
index_buffer.push_back(shapes[0].mesh.indices[i * 3 + 1].vertex_index);
index_buffer.push_back(shapes[0].mesh.indices[i * 3 + 2].vertex_index);
//index_buffer.push_back(shapes[0].mesh.indices[i * 2 + 0].texcoord_index);
//index_buffer.push_back(shapes[0].mesh.indices[i * 2 + 1].texcoord_index);
//index_buffer.push_back(0);
}
g_Mesh11.m_ppVertices = (BYTE**)&vertex_buffer;
g_Mesh11.m_ppIndices = (BYTE**)&index_buffer;
//Magic Numbers that make it use every vertex and index
int vertexes_size = (vertex_buffer.size()) * sizeof(float) *1.5F;
int indexes_size = shapes[0].mesh.indices.size() * sizeof(UINT) *3;
//Set Vertex Buffer Array
g_Mesh11.m_pMeshArray = new SDKMESH_MESH;
g_Mesh11.m_pVertexBufferArray = new SDKMESH_VERTEX_BUFFER_HEADER;
g_Mesh11.m_pMeshArray[0].VertexBuffers[0] = 0;
D3D11_BUFFER_DESC bufferDesc;
bufferDesc.ByteWidth = (UINT)(vertexes_size);
bufferDesc.Usage = D3D11_USAGE_DEFAULT;
bufferDesc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
bufferDesc.CPUAccessFlags = 0;
bufferDesc.MiscFlags = 0;
D3D11_SUBRESOURCE_DATA InitData;
InitData.pSysMem = &attrib.vertices[0];
dxCtr->m_pDevice->CreateBuffer(&bufferDesc, &InitData, &g_Mesh11.m_pVertexBufferArray[g_Mesh11.m_pMeshArray[0].VertexBuffers[0]].pVB11);
g_Mesh11.m_pVertexBufferArray[g_Mesh11.m_pMeshArray[0].VertexBuffers[0]].StrideBytes = 12;
g_Mesh11.m_pVertexBufferArray[g_Mesh11.m_pMeshArray[0].VertexBuffers[0]].SizeBytes = vertexes_size;
//Set Index Buffer array
g_Mesh11.m_pMeshArray[0].IndexBuffer = 0;
g_Mesh11.m_pIndexBufferArray = new SDKMESH_INDEX_BUFFER_HEADER;
g_Mesh11.m_pIndexBufferArray[g_Mesh11.m_pMeshArray[0].IndexBuffer].IndexType = IT_32BIT;
D3D11_BUFFER_DESC bufferDesc2;
bufferDesc2.ByteWidth = (UINT)(indexes_size);
bufferDesc2.Usage = D3D11_USAGE_DEFAULT;
bufferDesc2.BindFlags = D3D11_BIND_INDEX_BUFFER;
bufferDesc2.CPUAccessFlags = 0;
bufferDesc2.MiscFlags = 0;
D3D11_SUBRESOURCE_DATA InitData2;
InitData2.pSysMem = &index_buffer[0];
dxCtr->m_pDevice->CreateBuffer(&bufferDesc, &InitData2, &g_Mesh11.m_pIndexBufferArray[g_Mesh11.m_pMeshArray[0].IndexBuffer].pIB11);
g_Mesh11.m_pIndexBufferArray[g_Mesh11.m_pMeshArray[0].IndexBuffer].SizeBytes = indexes_size;
//Set subset
SDKMESH_SUBSET v_subset;
//v_subset.Name = "Base";
v_subset.MaterialID = 0;
v_subset.PrimitiveType = PT_TRIANGLE_LIST;
v_subset.IndexCount = num_indices;
v_subset.VertexCount = num_vertices;
v_subset.VertexStart = 0;
v_subset.IndexStart = 0;
g_Mesh11.m_pMeshArray[0].pSubsets = new UINT;
g_Mesh11.m_pMeshArray[0].pSubsets[0] = 0;
g_Mesh11.m_pMeshArray[0].NumSubsets = 1;
g_Mesh11.m_pSubsetArray = new SDKMESH_SUBSET;
g_Mesh11.m_pSubsetArray[g_Mesh11.m_pMeshArray[0].pSubsets[0]] = v_subset;
解决方案是将数据交错到一个顶点缓冲区中。这可能需要复制顶点，比如位置相同，但纹理坐标或法线不同。
struct Vertex
{
DirectX::XMFLOAT3 position;
DirectX::XMFLOAT3 normal;
DirectX::XMFLOAT2 textureCoordinate;
};
typedef std::unordered_multimap<UINT, UINT> VertexCache;
DWORD AddVertex(UINT hash, Vertex* pVertex, VertexCache& cache)
{
auto f = cache.equal_range(hash);
for (auto it = f.first; it != f.second; ++it)
{
auto& tv = vertices[it->second];
if (0 == memcmp(pVertex, &tv, sizeof(Vertex)))
{
return it->second;
}
}
DWORD index = static_cast<UINT>(vertices.size());
vertices.emplace_back(*pVertex);
VertexCache::value_type entry(hash, index);
cache.insert(entry);
return index;
}
可以像这样使用：
// If a duplicate vertex doesn't exist, add this vertex to the Vertices
// list. Store the index in the Indices array. The Vertices and Indices
// lists will eventually become the Vertex Buffer and Index Buffer for
// the mesh.
DWORD index = AddVertex(vertexIndex, &vertex, vertexCache);
有关完整的实现，请参阅DirectXMesh库附带的WaveFrontReader.h和meshconvert。
好的，我修复了它，我不知道为什么它会这样工作，但
对于Texcords ，索引缓冲区必须为0
bool LoadOBJ(std::string object_file)
{
TinyObjLoader::LoadOBJ(object_file);
g_Mesh11.m_pMaterialArray = new SDKMESH_MATERIAL;
std::wstring strPath = L"Media\Base_skin.dds";
if (FAILED(DXUTGetGlobalResourceCache().CreateTextureFromFile(dxCtr->m_pDevice, dxCtr->m_pImmediateContext, strPath.c_str(), &g_Mesh11.m_pMaterialArray->pDiffuseRV11,true)))
g_Mesh11.m_pMaterialArray->pDiffuseRV11 = (ID3D11ShaderResourceView*)ERROR_RESOURCE_VALUE;
SDKMESH_SUBSET* pSubset = nullptr;
D3D11_PRIMITIVE_TOPOLOGY PrimType;
struct T_Vertex
{
float vX;
float vY;
float vZ;
float nX;
float nY;
float nZ;
float tX;
float tY;
UINT vXIndex;
UINT vYIndex;
UINT vZIndex;
UINT nXIndex;
UINT nYIndex;
UINT nZIndex;
UINT tXIndex;
UINT tYIndex;
};
std::vector<T_Vertex> temp_vertices;
size_t index_offset = 0;
for (size_t f = 0; f < shapes[0].mesh.num_face_vertices.size(); f++) {
int fv = shapes[0].mesh.num_face_vertices[f];
// Loop over vertices in the face.
for (size_t v = 0; v < fv; v++) {
// access to vertex
tinyobj::index_t idx = shapes[0].mesh.indices[index_offset + v];
T_Vertex temp_vertex;
temp_vertex.vX = attrib.vertices[3 * idx.vertex_index + 0];
temp_vertex.vY = attrib.vertices[3 * idx.vertex_index + 1];
temp_vertex.vZ = attrib.vertices[3 * idx.vertex_index + 2];
temp_vertex.nX = attrib.normals[3 * idx.normal_index + 0];
temp_vertex.nY = attrib.normals[3 * idx.normal_index + 1];
temp_vertex.nZ = attrib.normals[3 * idx.normal_index + 2];
temp_vertex.tX = attrib.texcoords[2 * idx.texcoord_index + 0];
temp_vertex.tY = attrib.texcoords[2 * idx.texcoord_index + 1];
temp_vertex.vXIndex = 3 * idx.vertex_index + 0;
temp_vertex.vYIndex = 3 * idx.vertex_index + 1;
temp_vertex.vZIndex = 3 * idx.vertex_index + 2;
temp_vertex.nXIndex = 3 * idx.normal_index + 0;
temp_vertex.nYIndex = 3 * idx.normal_index + 1;
temp_vertex.nZIndex = 3 * idx.normal_index + 2;
temp_vertex.tXIndex = 3 * idx.texcoord_index + 0;
temp_vertex.tYIndex = 3 * idx.texcoord_index + 1;
temp_vertices.push_back(temp_vertex);
}
index_offset += fv;
}
std::vector<float> vertex_buffer;
std::vector<UINT> index_buffer;
for (auto& temp_vertex : temp_vertices)
{
vertex_buffer.push_back(temp_vertex.vX);
vertex_buffer.push_back(temp_vertex.vY);
vertex_buffer.push_back(temp_vertex.vZ);
vertex_buffer.push_back(temp_vertex.nX);
vertex_buffer.push_back(temp_vertex.nY);
vertex_buffer.push_back(temp_vertex.nZ);
vertex_buffer.push_back(temp_vertex.tX);
vertex_buffer.push_back(temp_vertex.tY);
vertex_buffer.push_back(0);
index_buffer.push_back(temp_vertex.vXIndex);
index_buffer.push_back(temp_vertex.vYIndex);
index_buffer.push_back(temp_vertex.vZIndex);
index_buffer.push_back(temp_vertex.nXIndex);
index_buffer.push_back(temp_vertex.nYIndex);
index_buffer.push_back(temp_vertex.nZIndex);
index_buffer.push_back(0);
index_buffer.push_back(0);
index_buffer.push_back(0);
}
int num_vertices = vertex_buffer.size();
int num_indices = index_buffer.size();
g_Mesh11.m_ppVertices = (BYTE**)&vertex_buffer;
g_Mesh11.m_ppIndices = (BYTE**)&index_buffer;
int vertexes_size = vertex_buffer.size() * sizeof(float); int indexes_size = index_buffer.size() * sizeof(UINT);
//Set Vertex Buffer Array
g_Mesh11.m_pMeshArray = new SDKMESH_MESH;
g_Mesh11.m_pVertexBufferArray = new SDKMESH_VERTEX_BUFFER_HEADER;
int t = g_Mesh11.m_pMeshArray[0].VertexBuffers[0];
g_Mesh11.m_pMeshArray[0].VertexBuffers[0] = 0;
D3D11_BUFFER_DESC bufferDesc;
bufferDesc.ByteWidth = (UINT)(vertexes_size);
bufferDesc.Usage = D3D11_USAGE_DEFAULT;
bufferDesc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
bufferDesc.CPUAccessFlags = 0;
bufferDesc.MiscFlags = 0;
D3D11_SUBRESOURCE_DATA InitData;
InitData.pSysMem = &vertex_buffer[0];
dxCtr->m_pDevice->CreateBuffer(&bufferDesc, &InitData, &g_Mesh11.m_pVertexBufferArray[g_Mesh11.m_pMeshArray[0].VertexBuffers[0]].pVB11);
g_Mesh11.m_pVertexBufferArray[g_Mesh11.m_pMeshArray[0].VertexBuffers[0]].StrideBytes = 36;// 12;
g_Mesh11.m_pVertexBufferArray[g_Mesh11.m_pMeshArray[0].VertexBuffers[0]].SizeBytes = vertexes_size;
//Set Index Buffer array
g_Mesh11.m_pMeshArray[0].IndexBuffer = 0;
g_Mesh11.m_pIndexBufferArray = new SDKMESH_INDEX_BUFFER_HEADER;
g_Mesh11.m_pIndexBufferArray[g_Mesh11.m_pMeshArray[0].IndexBuffer].IndexType = IT_32BIT;
D3D11_BUFFER_DESC bufferDesc2;
bufferDesc2.ByteWidth = (UINT)(indexes_size);
bufferDesc2.Usage = D3D11_USAGE_DEFAULT;
bufferDesc2.BindFlags = D3D11_BIND_INDEX_BUFFER;
bufferDesc2.CPUAccessFlags = 0;
bufferDesc2.MiscFlags = 0;
D3D11_SUBRESOURCE_DATA InitData2;
InitData2.pSysMem = &index_buffer[0];
dxCtr->m_pDevice->CreateBuffer(&bufferDesc2, &InitData2, &g_Mesh11.m_pIndexBufferArray[g_Mesh11.m_pMeshArray[0].IndexBuffer].pIB11);
g_Mesh11.m_pIndexBufferArray[g_Mesh11.m_pMeshArray[0].IndexBuffer].SizeBytes = indexes_size;
//Set subset
SDKMESH_SUBSET v_subset;
v_subset.MaterialID = 0;
v_subset.PrimitiveType = PT_TRIANGLE_LIST;
v_subset.IndexCount = num_indices;
v_subset.VertexCount = num_vertices;
v_subset.VertexStart = 0;
v_subset.IndexStart = 0;
g_Mesh11.m_pMeshArray[0].pSubsets = new UINT;
g_Mesh11.m_pMeshArray[0].pSubsets[0] = 0;
g_Mesh11.m_pMeshArray[0].NumSubsets = 1;
g_Mesh11.m_pSubsetArray = new SDKMESH_SUBSET;
g_Mesh11.m_pSubsetArray[g_Mesh11.m_pMeshArray[0].pSubsets[0]] = v_subset;
return true;
}
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