Analysis of Main Technical Methods of 3D Model O BJ Format Lightweight Compression
OBJ format is a commonly used 3D model file format, which saves the vertices, texture coordinates and normal information of the model in text form. In order to achieve lightweight compression, the following main technical methods can be adopted:
1. Simplify the mesh: reduce the file size by reducing the number of vertices in the model. The simplification algorithm can merge similar vertices according to certain strategies, such as Quadric Error Metrics (QEM) or edge collapse algorithm. This preserves the approximate shape of the model while reducing redundant data.
2. Texture compression: For models containing texture maps, texture compression algorithms can be used to reduce the size of map files. Common texture compression algorithms include JPEG, PNG, etc. The appropriate compression algorithm can be selected according to the needs of the model, and the compression ratio and quality can be traded off.
3. Normal compression: The normal information in the model can use some compression algorithms to reduce the storage space. For example, Spherical Harmonics can be used to approximate normal information and represent it as coefficients. This reduces the normal information from a 3D vector to a set of coefficients, saving storage space.
4. Optimize data storage method: When saving OBJ files, you can consider using a more compact data storage method. For example, you can convert floating-point numbers to fixed-point representations, or use integers to represent vertex and texture coordinates. Additionally, data can be saved in binary format instead of text format to further reduce file size.
5. Hierarchical representation: For a complex model, it can be decomposed into multiple sub-models or hierarchical structures. Each submodel can be compressed individually and loaded dynamically when needed. This reduces memory footprint and file size without sacrificing model quality.
To sum up, the main technical methods for lightweight compression of OBJ format include mesh simplification, texture compression, normal compression, optimization of data storage methods, and hierarchical representation. By adopting these methods, the size of the 3D model file can be effectively reduced, and the efficiency of loading and rendering can be improved.
6. How to realize the lightweight compression of ultra-large-scale 3D models, fast and efficient processing tool software is very important to ensure lightweight data size and quality, reduce storage and transmission costs, improve visualization performance, and expand application scenarios. The following is a fast and efficient 3D model lightweight software.
Introduction to 3D Factory Software
3D factory K3DMaker is a professional processing software with functions such as 3D model browsing, analysis, lightweight, top-level merge construction, geometric correction, format conversion, color and cutting. Operations such as mesh simplification, texture compression, and level optimization of the 3D model can be performed, so as to realize the lightweight of the 3D model. Large lightweight compression ratio, high model lightweight efficiency, and high automatic processing capability; use a variety of algorithms to perform geometric fine correction processing on 3D models, with high precision, fast processing speed, and super large model support; excellent data processing and conversion tools, support Convert the 3D model in OSGB format to 3DTiles and other formats, which can be converted quickly. Come and experience it. The download address is shown in the illustration.
