Rigid Body Gravity Adjustment for Surface Sag Simulation
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Solution Overview
Problem
Existing technologies face difficulties in accurately representing the sag of an object's surface when another object rides or clings to it, particularly in computer graphics that combine physical simulation and three-dimensional image generation.
Innovation Solution
A computer-readable storage medium and device that adjusts gravity parameters of rigid bodies within an object based on their positional relationship with a second object, physically calculates the motion of these rigid bodies, and renders an image of the object's surface to depict natural sagging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a calculation technology of delaying a timing of a movement of only a specific area of a surface of an object is used, then it can represent a sag of the surface of the object, but it is difficult to express a sag caused by an object clinging or riding on another object
Solution Approach 1:
The patent changes the gravity parameter of rigid bodies based on their positional relationship with a second object. When a second object approaches or contacts a first object, the gravity parameter of the first object's rigid bodies is increased, causing them to sag naturally. This resolves the contradiction by using a universal parameter change mechanism that works for both general surface sag and specific clinging/riding scenarios.
Solution Approach 2:
The patent divides the first object into multiple rigid bodies that are constrained to one another. Each rigid body can independently respond to the presence of a second object, allowing localized sagging at contact points while maintaining the overall structure. This segmentation enables the system to handle complex clinging and riding scenarios that a single surface model cannot address.
2Manufacturing precision
If gravity parameters are changed based on positional relationship with a second object, then natural sag can be expressed when another object rides or clings, but the calculation complexity increases
Solution Approach 1:
The patent applies gravity parameter changes only to rigid bodies that have a specific positional relationship with a second object, rather than changing parameters for all rigid bodies uniformly. This localized approach maintains calculation efficiency while achieving accurate sag representation at contact points, resolving the contradiction between precision and complexity.
Solution Approach 2:
The patent uses a threshold-based approach where gravity parameters are changed only when the second object is within a certain distance or in contact with the first object. This partial action approach avoids unnecessary calculations for distant objects, reducing overall computational complexity while maintaining accurate sag expression when needed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively generates images that accurately represent the natural sag of an object when contacted or ridden by another, enhancing the realism of three-dimensional image generation in virtual spaces.
Implementation Method 1
changing a parameter relating to gravity of each of a plurality of rigid bodies which are constrained to one another and included in a first object based on a positional relationship between each of the plurality of rigid bodies and a second object; physically calculating a motion of each of the plurality of rigid bodies included in the first object based on the changed parameter
Data Source
AI summary
An image generating device includes: a gravity parameter changing section for changing a parameter relating to gravity of each of a plurality of rigid bodies which are constrained to one another and included in a first object based on a positional relationship between each of the plurality of rigid bodies and a second object; a physical calculation section for physically calculating a motion of each of the plurality of rigid bodies included in the first object based on the changed parameter; and an image rendering section for rendering an image representing a surface of the first object based on the motions of the plurality of rigid bodies included in the first object.