VTK File Handling in Three.js

Displaying VTK Files in Three.js

1. VTK File Support: Three.js doesn't have a built-in loader for VTK files in its core library or in the documented addons. The loaders available in Three.js include formats like GLTF, OBJ, 3DM, and others, but not specifically VTK.

2. Possible Solutions:

   • Use a third-party VTK loader for Three.js, such as vtk.js which can be integrated with Three.js
   • Convert your VTK files to a format that Three.js supports natively (like GLTF)
   • Create a custom parser for VTK files that converts the data into Three.js geometries

Performance Optimization for Real-time Simulation

Regarding your second question about loading and performance:

1. Frame-by-Frame Loading: Loading each FEA result file individually would indeed create performance issues, especially with dozens of files per second.

2. Optimization Strategies:

   • Pre-processing: Convert your VTK data into a more efficient format for web visualization
   • Data Streaming: Instead of loading complete files, stream only the changes between frames
   • Level of Detail (LOD): Implement different mesh resolutions based on viewing distance
   • Client-side Caching: Cache previously loaded frames to avoid redundant downloads
   • Pre-generated Animations: For predictable simulations, pre-generating animations could significantly improve performance by reducing the need to process raw FEA data in real-time

3. Hybrid Approach: Consider a hybrid approach where you:

   • Pre-generate animations for common scenarios
   • Load detailed FEA results only when needed for specific analysis
   • Use simplified meshes for real-time interaction and detailed meshes for analysis

For your specific wind turbine simulation, you might want to separate the rotation animation (which could be handled by Three.js animation system) from the FEA results visualization (which might require more specialized handling).

Given the complexity of FEA data and the performance requirements of real-time visualization, you may need to develop a custom solution that balances accuracy and performance for your specific use case.