3D Mesh Model Rigging via Muscle and Nurbs Parametric Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing 3D modeling techniques fail to realistically represent dynamic objects with a skeleton structure, as they require skilled manipulation and do not allow for natural shape transformation or animation, and often require matching mesh models for skeleton transfer.
Innovation Solution
A method for automatic rigging and shape surface transfer of a 3D standard mesh model using muscle and Nurbs parametric control, which extracts a joint-skeleton structure, generates muscle and appearance surfaces, and transfers a standard mesh model based on multi-view image information to create a realistic, animatable mesh model.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If volume models are used to generate 3-D models from image information, then the model can represent the appearance of dynamic objects, but the shape cannot be transformed or the motion appears unnatural
Solution Approach 1:
The patent segments the 3-D model into multiple controllable components: skeleton structure with joints, muscle structures, and skin surface. This segmentation allows independent transformation of each component, enabling natural shape changes and realistic motion while maintaining appearance accuracy.
Solution Approach 2:
The patent implements a dynamic hierarchical structure where the skeleton provides the base transformation, muscles deform accordingly, and the skin surface adapts to both. This dynamic multi-layer system enables realistic motion representation while maintaining shape transformability.
2Adaptability or versatility
If skeleton transfer methods are used, then the skeleton structure can be transferred to the target model, but the target model must have the same mesh model as the standard model
Solution Approach 1:
The patent creates a universal skeleton-based hierarchical structure that can be applied to any mesh model regardless of its specific geometry. The skeleton and muscle system serves multiple functions: providing transformable structure, enabling animation, and adapting to different target models, thus achieving both compatibility and ease of manufacture.
Solution Approach 2:
The patent uses parameter-based control where the skeleton structure, muscle parameters, and skin properties can be adjusted independently. This parameterization allows the same hierarchical system to adapt to different mesh models by changing parameters rather than requiring exact mesh matching, improving both versatility and ease of manufacture.
3Shape
If previous frames or geometrically similar mesh regions are transferred, then the appearance can be partially transferred, but the skeleton structure is not transferred requiring manual generation
Solution Approach 1:
The patent performs preliminary skeleton extraction and hierarchical structure generation before appearance transfer. By establishing the skeleton and muscle framework first, the system enables automatic skeleton transfer along with appearance, eliminating the need for manual skeleton generation while maintaining accurate appearance representation.
Data Source
AI summary
Provided is a method for automatic rigging and shape surface transfer of a 3-D standard mesh model based on muscles and Nurbs by using parametric control. In some embodiments, the method includes: extracting a joint-skeleton structure from scan data of dynamic objects having a skeleton structure, or input 3-D mesh models, generating a muscle and an appearance surface based on anatomy information, and generating a standard mesh model that approximates the appearance of the dynamic objects by using the joint-skeleton structure and the generated muscle and appearance surface; and performing the shape surface transfer of the standard mesh model by comparing multi-view image information of the dynamic objects with projection image information of the standard mesh model.