Assimp Loader

// Main importer class - always use with 'using' statement for proper disposal
using var importer = new AssimpContext();

// Optional: Configure importer settings
importer.SetConfig(new Assimp.Configs.VertexBoneWeightLimitConfig(4));

// Import a 3D model file with post-processing steps
var scene = importer.ImportFile(filePath,
    PostProcessSteps.Triangulate |           // Convert all polygons to triangles
    PostProcessSteps.GenerateSmoothNormals | // Generate normals if missing
    PostProcessSteps.CalculateTangentSpace); // Calculate tangent vectors

/**
### Key Scene Properties
- `scene.MeshCount` - Number of meshes in the loaded model
- `scene.Meshes[index]` - Access individual meshes by index
**/

var mesh = scene.Meshes[0]; // Get first mesh

// Vertex count
int vertexCount = mesh.VertexCount;

// Vertex positions (always present)
var position = mesh.Vertices[i]; // Returns Vector3D
float x = position.X;
float y = position.Y;
float z = position.Z;

// Check for and access normals
if (mesh.HasNormals)
{
    var normal = mesh.Normals[i]; // Returns Vector3D
}

// Check for and access texture coordinates
if (mesh.HasTextureCoords(0)) // Channel 0 is most common
{
    var texCoord = mesh.TextureCoordinateChannels[0][i]; // Returns Vector3D
    float u = texCoord.X;
    float v = texCoord.Y;
}

// Access face indices for triangle rendering
foreach (var face in mesh.Faces)
{
    foreach (var index in face.Indices)
    {
        // Use index to reference vertices
    }
}