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A Smart Pad Assisted Hybrid Sketch System for the Conceptual Design of Vehicles
Ashok Kumar Patil,Shashidhar Patil,Sanghun Nam,Dubeom Kim,Youngho Chai 중앙대학교 영상콘텐츠융합연구소 2015 TechArt :Journal of Arts and Imaging Science Vol.2 No.1
In this paper, a sketching system that uses a tablet computer and a large display connected to a 3D modeling server is proposed for the conceptual modeling stage of vehicles. The plane sketch interface can be conveniently used to set the volume and proportion of a vehicle in conceptual design, and the spatial sketch interface can be used for 3D model modification efficiently. Using a tablet computer, which can be easily carried and used to implement the plane input, the advantages of both sketch interfaces can be exploited. The modeling server connected to the large display shows complicated 3D models, traces, and spatial movement using sensors embedded in the tablet computer, and makes curve-based modeling and deformation possible by the use of the touch screen input. A system has been developed to maintain the plane sketch interface that is familiar to designers. The 3D spatial modeling is implemented using a method that involves selecting cross-planes of a 3D model by moving the tablet computer and applying it to the 3D model to modify the curves of the cross-plane shown on the tablet display.
Analysis of Efficient Visualization and Interactive Editing of 3D Point Cloud Data
Rekha Patil,Ashok Kumar Patil,Youngho Chai 중앙대학교 영상콘텐츠융합연구소 2016 TechArt :Journal of Arts and Imaging Science Vol.3 No.2
In this study, an efficient technique for immersive visualization of point cloud data is described and analyzed, and a manual extraction method is proposed. With the advancement of reconstruction technologies, laser scanned point cloud data has gained importance in robotics, 3D model reconstruction, and other computer fields. The point cloud data from the laser scanner has been widely used to reconstruct into a realistic 3D model. The 3D visualization of an unprocessed point cloud data from the laser scanner is often necessary to perform visual analysis, interactive selection, and editing operations in 3D. For the interactive visualization of point cloud data, OpenGL point primitives are used to accelerate for proficient rendering. The manual editing operations are performed using octree-based neighbors within a radius search algorithm. Finally, the implementation and performance comparison between an octree and kd-tree radius search method are evaluated using real-world example datasets.
G Ajay Kumar,Ashok Kumar Patil,Hanna Lee(이한나),Ire Eom(엄이레),Young Ho Chai(채영호) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
The use of laser scanner 3D point cloud data and CAD models help for construction, monitoring and retrofitting of complex engineering objects in heavy industrial plants. Moreover, it reduces the time, effort, and cost required for the BIM process. Connecting the laser scanner generated point cloud data with physical world helps the users to find, analyze and modify the specific element of the model corresponding to the physical model. This paper presents a framework for point cloud acquisition, alignment of generated point cloud data with physical world model, adaptive 3D modeling and retrofitting. The workflow includes an efficient 4 in 1 approach, beginning with the alignment of preprocessed point cloud data with real world physical model using real time partial point cloud from LiDAR, next automated 3D model generation from point cloud data and virtual retrofitting of CAD models, finally an overlap of generated 3D models on the real environment from the camera-view is efficiently visualized using wearable VR device. The method is demonstrated in a real-world setting, using the partial point cloud from LiDAR, pre-processed real-world point cloud data and CAD models of an industrial plant.
Nam, Sanghun,Patil, Ashok Kumar,Patil, Shashidhar,Chintalapalli, Harinadha Reddy,Park, Kyoungju,Chai, Youngho SAGE Publications 2013 Proceedings of the Institution of Mechanical Engin Vol.227 No.12
<P>A spatial modelling system with a new interface which is optimized for automotive design is proposed in the conceptual modelling phase. In the initial sketch stage to set the volume and the ratio of the car, the automotive styling is created using a two-dimensional plane sketch with an accurate input and a designer-friendly interface. The character lines, which have important implications in the design of the car, are drawn with a curve-based oversketch. The shape of the car is modified using area-based modification. A completed two-dimensional model consists of converting the character lines to a three-dimensional car model. In the three-dimensional spatial oversketch stage, the edge and mesh on the surface are deformed by viewing the three-dimensional shape of the vehicle with various views using a spatial input device and stereoscopic display. Edge-based deformation modifies single or multiple edges while maintaining continuity between the surfaces. A sculpting technique is applied to execute special shapes such as the accent lines and the strake lines. A sketch system which can be used by designers to perform three-dimensional spatial modelling is proposed.</P>
Retrofitting with Gesture Interaction and All-in-One Visualization in HMD
Chethana B,Pavan Kumar B N,Ashok Kumar Patil,Adithya Balasubramanyam,Young Ho Chai 중앙대학교 영상콘텐츠융합연구소 2019 TechArt :Journal of Arts and Imaging Science Vol.6 No.2
This study proposes a gesture-based method for retrofitting existing industrial facilities in a virtual environment using large point cloud data (PCD) produced by a laser scanner mounted on an unmanned aerial vehicle with a computer-generated design (CAD) model. For this propose, a motion-tracked controller is used to define gestures to interact with a head-mounted display, thus visualizing the point cloud data and the computeraided design model. This paper proposes a method for frame-by-frame visualization for all-in-one alignment of pre-processed, partial point cloud data, CAD model, and video, which allows decision makers to visualize and analyze the retrofitting site in a virtual environment before actual implementation to reduce time and costs. Finally, the significance of the proposed methods is tested onsite by considering a water treatment facility.
Adithya Balasubramanyam,Chethana B,Ashok Kumar Patil,Pavan Kumar B N,Young Ho Chai 중앙대학교 영상콘텐츠융합연구소 2019 TechArt :Journal of Arts and Imaging Science Vol.6 No.2
This article discusses techniques for interactively aligning chillers and visualizing energy consumption data on a pre-aligned point cloud data (PCD). Three different chillers with varied capacities are retrofit with the PCD. The operator can add, interactively align, and remove the chiller retrofits from the PCD. The proposed method provides an affordable and energy-aware upgrade. It helps in deciding the ideal combination of chiller retrofits based on power consumption. The method includes interacting with 3D chiller models with pre-defined energy limits and virtually aligning them on a pre-processed and video aligned PCD, thereby achieving a 4-in-1 alignment of the pre-processed PCD, the partial PCD, the video, and the chiller retrofit. Interaction with the 3D models and the PCD enables real-time understanding of the energy consumption of the chiller retrofits.
Sensed Unit Motion based Authoring for the Precise Human Movements
Bharatesh Chakravarthi(바라테스),Ashok Kumar Patil(아쇽 쿠말 파틸),Adithya Balasubramanyam(아디띠야 비),Jae Yeong Ryu(류재영),Young Ho Chai(채영호) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
With the expeditious advancements in Motion Capture (mocap) systems, maneuvering motion data for extensive usage is a challenging task. In this paper, we propose a comprehensive technique to author new motion or modify existing motion data by considering vital motion parameters. Motion data is a collection of motion frames where each frame corresponds to the position and orientation of bone segments. Unit motion is a sequence of motion between any two keyframes captured either using a mocap system or authored using a conventional motion authoring tool. We consider a predefined set of unit motions to author precise human movements. Unit motion editing modifies swing, twist, and speed parameters to generate a consistent, accurate, and meaningful motion. The resultant unit motions are integrated into a meaningful sequence to synthesize various desired human movements. We demonstrate our work using a set of basic unit yoga motions to author meticulous and complete yoga movements.