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Merge pull request 'STL exporting using assimp' (#197) from stl_exporter into master

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Reviewed-on: https://git.madvoxel.net/OpenVulkano/OpenVulkano/pulls/197
Reviewed-by: Georg Hagen <georg.hagen@madvoxel.com>
This commit is contained in:
Vladyslav_Baranovskyi_EXT
2025-02-11 10:45:25 +01:00
parent c41acb47c2 561e4b2846
commit a4c6122ed6
2 changed files with 121 additions and 73 deletions
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193
openVulkanoCpp/Scene/Export/MeshWriter.cpp
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@@ -24,6 +24,82 @@
#include <assimp/material.h>
#endif
namespace
{
#if __has_include("assimp/Exporter.hpp")
void SetupAssimpScene(OpenVulkano::Scene::Geometry* geometry, aiScene& scene, aiNode& rootNode, aiMesh& mesh,
std::unique_ptr<unsigned int[]>& indices, bool withTexCoords, float scaling)
{
mesh.mVertices = nullptr;
mesh.mNormals = nullptr;
mesh.mTangents = nullptr;
mesh.mBitangents = nullptr;
mesh.mFaces = nullptr;
for(unsigned int i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i) {
mesh.mTextureCoords[i] = nullptr;
mesh.mNumUVComponents[i] = 0;
}
for(unsigned int i = 0; i < AI_MAX_NUMBER_OF_COLOR_SETS; ++i) {
mesh.mColors[i] = nullptr;
}
rootNode.mName = aiString("RootNode");
rootNode.mChildren = nullptr;
rootNode.mNumChildren = 0;
scene.mRootNode = &rootNode;
mesh.mName = aiString("Mesh");
mesh.mNumVertices = geometry->vertexCount;
mesh.mMaterialIndex = 0;
mesh.mPrimitiveTypes = aiPrimitiveType_TRIANGLE;
mesh.mVertices = new aiVector3D[geometry->vertexCount];
mesh.mNormals = new aiVector3D[geometry->vertexCount];
if (withTexCoords)
{
mesh.mNumUVComponents[0] = 2;
mesh.mTextureCoords[0] = new aiVector3D[geometry->vertexCount];
}
for (int i = 0; i < geometry->vertexCount; ++i)
{
const OpenVulkano::Vertex& vertex = geometry->vertices[i];
mesh.mVertices[i] = aiVector3D(vertex.position.x, vertex.position.y, vertex.position.z) * scaling;
mesh.mNormals[i] = aiVector3D(vertex.normal.x, vertex.normal.y, vertex.normal.z);
if (withTexCoords)
{
mesh.mTextureCoords[0][i] = aiVector3D(vertex.textureCoordinates.x, vertex.textureCoordinates.y, 0.0f);
}
}
mesh.mNumFaces = geometry->indexCount / 3;
mesh.mFaces = new aiFace[mesh.mNumFaces];
indices = std::make_unique<unsigned int[]>(geometry->indexCount);
for (unsigned int i = 0; i < geometry->indexCount; ++i)
{
indices[i] = geometry->GetIndex(i);
}
for (unsigned int i = 0; i < mesh.mNumFaces; ++i)
{
mesh.mFaces[i].mNumIndices = 3;
mesh.mFaces[i].mIndices = &indices[i * 3];
}
scene.mNumMeshes = 1;
scene.mMeshes = new aiMesh*[1] { &mesh };
scene.mNumMaterials = 1;
scene.mMaterials = new aiMaterial*[1] { new aiMaterial() };
rootNode.mNumMeshes = 1;
rootNode.mMeshes = new unsigned int[1] { 0 };
}
#endif
}
namespace OpenVulkano::Scene
{
void MeshWriter::WriteAsOBJ(Geometry* geometry, const std::string& filePath)
@@ -90,92 +166,63 @@ namespace OpenVulkano::Scene
}
}
void MeshWriter::WriteAsSTL(Geometry* geometry, const std::string& filePath, bool binary)
{
#if __has_include("assimp/Exporter.hpp")
std::unique_ptr<aiScene> scene(new aiScene());
std::unique_ptr<aiNode> rootNode(new aiNode());
std::unique_ptr<aiMesh> mesh(new aiMesh());
std::unique_ptr<unsigned int[]> indices;
SetupAssimpScene(geometry, *scene, *rootNode, *mesh, indices, false, 1.0f);
Assimp::Exporter exporter;
const char* formatId = binary ? "stlb" : "stl";
aiReturn result = exporter.Export(scene.get(), formatId, filePath);
scene->mRootNode = nullptr;
scene->mMeshes = nullptr;
for (uint32_t i = 0; i < mesh->mNumFaces; ++i)
{
aiFace& face = mesh->mFaces[i];
face.mIndices = nullptr;
}
if (result != aiReturn_SUCCESS)
{
throw std::runtime_error("Unable to write STL file to " + filePath + ": " + exporter.GetErrorString());
}
#else
throw std::runtime_error("Unable to export to STL: Assimp is not available!");
#endif
}
void MeshWriter::WriteAsFBX(Geometry* geometry, const std::string& texturePath, const std::string& fbxPath)
{
#if __has_include("assimp/Exporter.hpp")
aiNode rootNode;
std::unique_ptr<aiScene> scene(new aiScene());
std::unique_ptr<aiNode> rootNode(new aiNode());
std::unique_ptr<aiMesh> mesh(new aiMesh());
std::unique_ptr<unsigned int[]> indices;
aiScene scene;
scene.mRootNode = &rootNode;
SetupAssimpScene(geometry, *scene, *rootNode, *mesh, indices, true, 100.0f);
aiMesh mesh;
mesh.mNumVertices = geometry->vertexCount;
mesh.mMaterialIndex = 0;
mesh.mPrimitiveTypes = aiPrimitiveType_TRIANGLE;
mesh.mNumUVComponents[0] = 2;
std::unique_ptr<aiVector3D[]> vertices = std::make_unique<aiVector3D[]>(geometry->vertexCount);
mesh.mVertices = vertices.get();
std::unique_ptr<aiVector3D[]> normals = std::make_unique<aiVector3D[]>(geometry->vertexCount);
mesh.mNormals = normals.get();
std::unique_ptr<aiVector3D[]> texCoords = std::make_unique<aiVector3D[]>(geometry->vertexCount);
mesh.mTextureCoords[0] = texCoords.get();
float scaling = 100; // fbx units are centimeters...
for (uint32_t i = 0; i < geometry->vertexCount; ++i)
if (!texturePath.empty())
{
const Vertex& vertex = geometry->vertices[i];
mesh.mVertices[i] = aiVector3D(vertex.position.x, vertex.position.y, vertex.position.z) * scaling;
mesh.mNormals[i] = aiVector3D(vertex.normal.x, vertex.normal.y, vertex.normal.z);
mesh.mTextureCoords[0][i] = aiVector3D(vertex.textureCoordinates.x, vertex.textureCoordinates.y, 0.0f);
}
mesh.mNumFaces = geometry->indexCount / 3;
std::unique_ptr<aiFace[]> faces = std::make_unique<aiFace[]>(mesh.mNumFaces);
mesh.mFaces = faces.get();
std::unique_ptr<unsigned int[]> indices = std::make_unique<unsigned int[]>(geometry->indexCount);
size_t lastUsedIndex = 0;
for (uint32_t i = 0; i < mesh.mNumFaces; ++i)
{
aiFace& face = mesh.mFaces[i];
face.mNumIndices = 3;
face.mIndices = &indices[lastUsedIndex];
face.mIndices[0] = geometry->GetIndex(i * 3 + 0);
face.mIndices[1] = geometry->GetIndex(i * 3 + 1);
face.mIndices[2] = geometry->GetIndex(i * 3 + 2);
lastUsedIndex += face.mNumIndices;
}
aiMesh* meshes[1] = { &mesh };
scene.mMeshes = meshes;
scene.mNumMeshes = 1;
unsigned int meshIndices[1];
scene.mRootNode->mMeshes = meshIndices;
scene.mRootNode->mMeshes[0] = 0;
scene.mRootNode->mNumMeshes = 1;
aiMaterial material;
aiMaterial* materials[1] = { &material };
scene.mMaterials = materials;
scene.mNumMaterials = 1;
aiString externalPath(texturePath);
scene.mMaterials[0]->AddProperty(&externalPath, AI_MATKEY_TEXTURE(aiTextureType_DIFFUSE, 0));
scene->mMaterials[0]->AddProperty(&externalPath, AI_MATKEY_TEXTURE(aiTextureType_DIFFUSE, 0));
}
Assimp::Exporter exporter;
aiReturn result = exporter.Export(&scene, "fbx", fbxPath);
aiReturn result = exporter.Export(scene.get(), "fbx", fbxPath);
mesh.mVertices = nullptr;
mesh.mNormals = nullptr;
mesh.mTextureCoords[0] = nullptr;
for (uint32_t i = 0; i < mesh.mNumFaces; ++i)
scene->mRootNode = nullptr;
scene->mMeshes = nullptr;
for (uint32_t i = 0; i < mesh->mNumFaces; ++i)
{
aiFace& face = mesh.mFaces[i];
aiFace& face = mesh->mFaces[i];
face.mIndices = nullptr;
}
mesh.mFaces = nullptr;
rootNode.mMeshes = nullptr;
scene.mRootNode = nullptr;
scene.mMeshes = nullptr;
scene.mMaterials = nullptr;
if (result != aiReturn_SUCCESS)
{

1
openVulkanoCpp/Scene/Export/MeshWriter.hpp
View File

@@ -19,5 +19,6 @@ namespace OpenVulkano::Scene
static void WriteObjAsZip(Geometry* geometry, const std::string& texturePath, const std::string& zipPath);
static void WriteAsUSDZ(Geometry* geometry, const std::string& texturePath, const std::string& usdzPath);
static void WriteAsFBX(Geometry* geometry, const std::string& texturePath, const std::string& fbxPath);
static void WriteAsSTL(Geometry* geometry, const std::string& filePath, bool binary);
};
}