This paper presents a new reflectance model for rendering computer synthesized images. The model accounts for the relative brightness of different materials and light sources in the same scene. It describes the directional distribution of the reflected light and a color shift that occurs as the reflectance changes with incidence angle. The paper presents a method for obtaining the spectral energy distribution of the light reflected from an object made of a specific real material and discusses a procedure for accurately reproducing the color associated with the spectral energy distribution. The model is applied to the simulation of a metal and a plastic.

A reflectance model for computer graphics

Virtual reality (VR) is a scientific method and technology created during the exploration of the nature by human beings to understand, simulate, and better adapt and use the nature. Based on the analysis on the whole process of VR, this paper presents different categories of VR problems and a type of theoretical expression, and abstracts three kinds of scientific and technical problems in VR field. On the basis of foresaid content, this paper also studies current major research objectives, research results and development trend of VR in the aspects of VR modeling method, VR representation technology, human-machine interaction and devices, VR development suites and supporting infrastructure, as well as VR applications. Finally, several theoretical and technical problems that need to be further studied and solved are addressed.

A survey on virtual reality

NLP (Natural Language Processing) is a technology that enables computers to understand human languages. Deep-level grammatical and semantic analysis usually uses words as the basic unit, and word segmentation is usually the primary task of NLP. In order to solve the practical problem of huge structural differences between different data modalities in a multi-modal environment and traditional machine learning methods cannot be directly applied, this paper introduces the feature extraction method of deep learning and applies the ideas of deep learning to multi-modal feature extraction. This paper proposes a multi-modal neural network. For each mode, there is a multilayer sub-neural network with an independent structure corresponding to it. It is used to convert the features in different modes to the same-modal features. In terms of word segmentation processing, in view of the problems that existing word segmentation methods can hardly guarantee long-term dependency of text semantics and long training prediction time, a hybrid network English word segmentation processing method is proposed. This method applies BI-GRU (Bidirectional Gated Recurrent Unit) to English word segmentation, and uses the CRF (Conditional Random Field) model to annotate sentences in sequence, effectively solving the long-distance dependency of text semantics, shortening network training and predicted time. Experiments show that the processing effect of this method on word segmentation is similar to that of BI-LSTM-CRF (Bidirectional- Long Short Term Memory-Conditional Random Field) model, but the average predicted processing speed is 1.94 times that of BI-LSTM-CRF, effectively improving the efficiency of word segmentation processing.

/pdf/feature-extraction-and-analysis-of-natural-language-2fwj96x5i5.pdf

Feature Extraction and Analysis of Natural Language Processing for Deep Learning English Language

With the help of learning environment created by virtual reality technology as a carrier, considering the characteristics of Engineering hydrology education, this paper proposes to establish a learning content management system of engineering hydrology courses, advocates to organize and implement teaching and assessment process in the system and explores the role of virtual reality technology in cultivating higher water vocational talents

Virtual Reality Technology in Engineering Hydrology Education

FSVDS, a visual demonstration system of flight simulation is designed and implemented based on OSG. FSVDS is highly configurable using a set of configuration files. FSVDS supports multiple display modes such as real time visualization of numerical simulation or simulation with semi-real objects, and playback content of path file and viewpoint file which can be recoded and edited by user. To support controls on progress of flight visual simulation such as play, pause, rollback and faster or slower simulation speed, FSM theory is employed to model the process of visual simulation. Based on OSG: Producer library, FSVDS implement a multi-viewport user interface with the ability of view ports shifting and active view port determination. FSVDS also provide physically based sky dome model and cloud system, as well as trail, trail fire and smoke based on OSG particle system. These make it very suitable for realistic flight simulation.

Visual simulation system for flight simulation based on OSG

BH_GRAPH: A Real Time 3D Graphics Platform

Motion String: A Motion Capture Data Representation for Behavior Segmentation

Deep Learning for Digital Geometry Processing and Analysis: A Review

Virtual Reality-based simulators is an important tool for surgical skills training and assessment. In general, the degree of realism experienced by the trainees is determined by the visual and biomechanical fidelity of the simulator. Organ textures can greatly affect visual realism and hence the overall quality of the simulation. In this paper, we use a very simple algorithm that can efficiently synthesize a wide variety of organ textures. The algorithm uses pixel-based texture synthesize technology. For each pixel in the output image, an L-shaped neighborhood of current pixel of a specific size is considered. Each pixel from this neighborhood generates a “shifted” candidate pixel according to its original position in the input texture. The best pixel is chosen with a neighborhood most similar to the current L-shaped neighborhood in the output image. This method is fast and its implementation is straightforward. The experiment results show the algorithm is feasility and validity.

Organ Texture Synthesis for Virtual Reality-Based Surgical Simulators

Bleeding simulation is important components of a surgical simulator. However, realistic simulation of bleeding is a challenging problem. There are several fluid flow models described in the literature, but they are computationally slow and do not satisfy real-time requirement of a surgical simulator. The paper introduce a bleeding simulation algorithm based on the particle system and implement arterial squirting blood, blood splashes in free space, blood drops running down a surface. This algorithm calculates how many blood particles are needed to model a particular instance of bleeding, and assigns a velocity to each particle in a gravitational field so that particles flow out of the injured region at the proper rate. The key characteristics of our algorithm are a visually realistic display and real-time computational performance. Experiment results show that proposed method is feasible and effective. In addition, this algorithm can also be used to simulate water irrigation and smoke effect in virtual surgery simulator.

Bleeding Simulation Based Particle System for Surgical Simulator

Handle everyday research tasks with reliable, citation-backed results

Your personal Research Agent to handle research tasks with citation-backed results

Popular Tasks used by Researchers

How can I help with your research?

Meet SciSpace

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

Hao Aimin

Author Tools

Chat about Author