Modeling method for enhanced force tactile of virtual reality human-computer interaction

A modeling method and human-computer interaction technology, applied in the input/output of user/computer interaction, 3D modeling, mechanical mode conversion, etc., can solve the problem of insufficient stability, low precision, and affecting real-time and effectiveness of calculations and other problems, to achieve the effect of accurately and quickly calculating the amount of deformation and improving the fidelity

Inactive Publication Date: 2009-11-25
NANTONG MINGGUANG ELECTRIC WIRE +1
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Problems solved by technology

[0003] At present, there are mainly five kinds of tactile modeling methods for soft tissue deformation simulation based on physical meaning: ① The spring-mass modeling method has the advantages of simplicity, small amount of calculation, and easy implementation, but its accuracy and stability are limited. Disadvantages such as difficulties in topology analysis
②Although the finite element modeling method is more accurate, it involves a lot of complicated calculations, and the real-time interaction performance is poor
③The shape retaining chain linked model (S-Chain Model) proposed by Kim et al. has the advantages of good real-time performance, but the chain eleme

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  • Modeling method for enhanced force tactile of virtual reality human-computer interaction
  • Modeling method for enhanced force tactile of virtual reality human-computer interaction
  • Modeling method for enhanced force tactile of virtual reality human-computer interaction

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Embodiment 1

[0046] A kind of enhanced force tactile modeling method for virtual reality human-computer interaction, it is characterized in that the main steps of this modeling method are as follows:

[0047] Step 1 initializes the virtual scene;

[0048] Step 2: Before the virtual agent (such as virtual tweezers, virtual finger, virtual probe, etc.) collides with the virtual soft tissue, that is, in the process of approaching the virtual soft tissue, the feedback output is related to the distance from the soft tissue surface. The white noise signal of the distribution, the white noise signal is:

[0049] σ · x = σ · - 2 log ( 1 - rand ...

specific Embodiment 2

[0071] 1. Construct a virtual liver model and a virtual tweezers model to realize the initialization of the virtual scene.

[0072] All virtual liver and virtual tweezers models in this example are directly in the format of OBJ exported from 3DS MAX 9.0 software, with 3116 particles, 6228 triangle meshes for the virtual liver and 174 particles, 348 triangle meshes Taking virtual medical tweezers as an example for deformation simulation, the model acquisition and modification are very convenient; the operating platform is Windows 2000, the development language is VC++6.0, and it is based on 3DS MAX 9.0 and OpenGL graphics library.

[0073] 2. Produce obedience related to the distance from the liver surface Distributed white noise signal.

[0074] The rand() in VC++6.0 environment generates a random integer between 0-32767, so that the proportional coefficient K=0.5N / cm (where N represents the unit Newton of force), the initial distance between the virtual tweezers and the sur...

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Abstract

The present invention discloses an enhanced force tactile modeling method for human-computer interaction in virtual reality systems based on physical significance, before a virtual proxy collides with virtual soft tissue, only white noise signal related to distance of the soft tissue is feedback output. In interaction process, feedback output a signal superimposed by a white noise signal of human skin sensitive perceptive and force tactile information of soft tissue real-time deformation simulation under external force action; in proportional layered coupled force tactile molding method, supraposition of sum of each spring deflection in every layer is external equivalent to deformation of object surface, and elastic force composite force of connected springs is equivalent to contact force of object surface. Calculation of the modeling method is simple that can calculate deformation rapidly and accurately, and implements real-time deformation simulation to the soft tissue. In the interaction process, natural and comfort, force tactile feels smooth, simulation effect is true.

Description

technical field [0001] The invention relates to a method for enhancing force tactile modeling, in particular to a method for modeling force tactile modeling of soft tissue deformation simulation based on physical meaning for virtual reality human-computer interaction. Background technique [0002] At present, for virtual reality technology, the continuously optimized and improved graphics algorithm and its software have been able to simulate three-dimensional virtual scenes vividly, and people's dissatisfaction with "unattainable" has prompted the use of force-tactile interaction devices in recent years. In the virtual world created by computer, the simulation of soft tissue deformation under the action of external force has attracted more and more researchers' attention and attention. Among them, the haptic modeling method of soft tissue deformation simulation based on physical meaning for virtual reality human-computer interaction has become the frontier and hot spot of cu...

Claims

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Application Information

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IPC IPC(8): G06F3/01G06T17/00G06T15/00
Inventor 宋爱国张小瑞孙伟李佳璐王楠程盈盈
Owner NANTONG MINGGUANG ELECTRIC WIRE
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