Sketch-Based Abstraction for 3D Character Posing
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Solution Overview
Problem
In 3D animation, rigging a character to achieve desired poses is complex and requires significant skill, as it involves coordinating thousands of vertices and parameters, whereas traditional 2D animation allows for tangible control over character shape but lacks the expressive deformation capabilities of 3D models.
Innovation Solution
A sketch-based abstraction method that augments a 3D character with a 2D representation, using energy formulations to measure the distance between user-drawn sketches and the 3D model's rigging controls, allowing for intuitive posing and customization by minimizing energy metrics to deform the 3D character.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional 3D rigging methods are used to control character poses, then the character model maintains high geometric fidelity and expressive deformation capability, but the operation complexity and skill requirement increase significantly
Solution Approach 1:
The patent introduces 2D sketch curves as an intermediary interface between the user and the complex 3D rigging system. Users draw simple 2D sketches to define desired poses, and the system automatically translates these sketches into corresponding 3D character poses by optimizing rig parameters. This intermediary layer abstracts away the complexity of thousands of rigging controls while preserving the ability to achieve expressive 3D deformations.
Solution Approach 2:
The patent creates a 2D copy or projection of the 3D character model that users can manipulate through sketching. Instead of directly controlling the complex 3D mesh and rigging parameters, users work with a simplified 2D representation that captures the essential pose information. The system then maps this 2D sketch back to the 3D model, effectively using the 2D copy as a control interface for the 3D system.
2Shape
If hand-drawn 2D animation methods are used to control character shapes, then artists have substantial tangible control over character shape, but the ability to achieve complex expressive deformations and maintain model consistency is limited
Solution Approach 1:
The patent bridges the 2D and 3D domains by allowing users to draw in 2D while achieving 3D posing results. The system projects the 3D character onto a 2D plane for sketching, then uses optimization algorithms to map the 2D sketch back to 3D space, adjusting rig parameters to achieve the desired pose. This dimensionality transition enables the simplicity of 2D drawing to combine with the expressive power of 3D deformation.
Solution Approach 2:
The system creates a 2D projection or copy of the 3D character that users can manipulate through sketching. This 2D representation maintains the essential geometric information needed for posing while being much simpler to control. The optimization process then uses this 2D sketch as a target to guide the 3D character into the corresponding pose, effectively using the 2D copy to control the 3D shape while maintaining model consistency.
3Manufacturing precision
If detailed rigging controls are used to achieve precise character poses, then the posing precision is improved, but the time required to learn and operate the system increases
Solution Approach 1:
The patent extracts only the essential pose-defining information from the full set of rigging controls. Instead of requiring users to manipulate thousands of individual vertex and joint parameters, the system identifies and optimizes a smaller subset of critical rig parameters that have the most significant impact on the overall character pose. This extraction of essential controls maintains posing precision while dramatically reducing the operational complexity and learning curve.
Solution Approach 2:
The 2D sketch serves as an intermediary that automatically translates user intent into precise 3D poses without requiring users to understand complex rigging parameters. The optimization algorithm acts as a mediator that bridges the simple 2D input and the complex 3D output, automatically adjusting the necessary rig parameters to achieve the desired pose with high precision while the user interacts only with the simple sketching interface.
Data Source
AI summary
In particular embodiments, a 2D representation of an object may be provided. A first method may comprise: receiving sketch input identifying a target position for a specified portion of the object; computing a deformation for the object within the context of a character rig specification for the object; and displaying an updated version of the object. A second method may comprise detecting sketch input; classifying the sketch input, based on the 2D representation, as an instantiation of the object; instantiating the object using a 3D model of the object; and displaying a 3D visual representation of the object.