• Title, Summary, Keyword: STL

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Reconstruction of 3D shape in STL file using slice data for RP (RP를 위한 슬라이스 데이터로부터 STL 포멧의 3차원 형상 재구성)

  • 허민성;최홍식;이석희
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.416-421
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    • 1997
  • This study presents a way to construct 3D shape in STL format from 2D slice data. Nowadays ahape reconstruct has been done in many ares, the application of this method is important especially in Reverse Engineering which reconstructs original shape from cross-section data. Current RP (Rapid Prototyping) is used not only for the verification of a part designed but also for the production and tooling in more effective way. In RP technology, data should be prepared in STL format. In this paper, the way to make 3D shape data in STL format form 2D slice data is described which can be used to reconstruct an original shape in RP equipment.

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A Study on DB Construction for Error Modification of STL Format and Efficiency by Shape Restoration (STL 포맷의 오류수정을 위한 DB 구축과 형상복구에 의한 효율성 연구)

  • 손영지;박정보;김순경;김중완;전언찬
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.12
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    • pp.21-27
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    • 1998
  • This paper recommends the database construction for STL data and the new method of Delaunay's triangulation method in order to decrease volume errors by verifying STL file errors and modifying hole errors. Each vertex for the boundary coordinates of the verified hole errors was analyzed according to the following cases: planes or slow curves, edges, apexes, and rapid curves. In each case, a different modification process was adopted. With this method, most errors resulting from the conversion into the STL data as well as lots of volume errors arising from error modification were decreased.

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A Study On the Boolean Operation Of STL Format (STL 포맷의 BOOLEAN 연산에 대한 연구)

  • Son, Beom-Soo;Jeon, Eon-Chan
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.9
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    • pp.194-201
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    • 2005
  • Recently, as Rapid Prototyping is attracting people's attention, many peoples are actively participating in the research on STL format. The STL files are transformed to be input for RP after modeling in CAD system. When the shape, however, needs to be changed or edited, it is impossible without the original data. So, if the original data is lost, new modeling is required. Therefore, this study suggests a way to edit the shape in STL format and to make the Boolean operation possible between the original and edited shapes. In addition, the reliability was confirmed after going over the errors of the edited data.

Development of a System to Convert a 3D Mesh Model in STL Format into OBJ Format (STL 3D 형식의 메쉬 모델을 형식으로 OBJ 변환하는 시스템 개발)

  • Yeo, Changmo;Park, Chanseok;Mun, Duhwan
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.17 no.3
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    • pp.78-86
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    • 2018
  • The 3D mesh model is used in various fields, such as virtual reality, shape-based searching, 3D simulation, reverse engineering, 3D printing, and laser scanning. There are various formats for the 3D mesh model, but STL and OBJ are the most typical. Since application systems support different 3D mesh formats, developing technology for converting 3D mesh models from one format into another is necessary to ensure data interoperability among systems. In this paper, we propose a method to convert a 3D mesh model in STL format into the OBJ format. We performed the basic design of the conversion system and developed a prototype, then verified the proposed method by experimentally converting an STL file into an OBJ file for test cases using this prototype.

Anticancer Activity of Sageretia thea Through β-catenin Proteasomal Degradation in Human Colorectal Cancer and Lung Cancer Cells

  • Kim, Ha Na;Park, Su Bin;Kim, Jeong Dong;Jeong, Jin Boo
    • Proceedings of the Plant Resources Society of Korea Conference
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    • pp.92-92
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    • 2019
  • In this study, we evaluated the effect of branch (STB) and leave (STL) extracts from Sageretia thea on ${\beta}$-catenin level in human colorecal cancer cells, SW480 and lung cancer cells, A549. STB and STL dose-dependently suppressed the growth of SW480 and A549 cells. STB and STL decreased ${\beta}$-catenin level in both protein and mRNA level. MG132 decreased the downregulation of ${\beta}$-catenin protein level induced by STB and STL. However, the inhibition of $GSK3{\beta}$ by LiCl or ROS scavenging by NAC did not block the reduction of ${\beta}$-catenin protein by STB and STL. Our results suggested that STB and STL may downregulate ${\beta}$-catenin protein level independent on $GSK3{\beta}$ and ROS. Based on these findings, STB and STL may be a potential candidate for the development of chemopreventive or therapeutic agents for human colorectal cancer and lung cancer.

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STL 포맷의 구멍 오류 수정을 위한 삼각형 분할법 적용에 관한 연구

  • 손영지;조연상;전언찬
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.889-893
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    • 1995
  • This paper verified error of STL file and presented a new application of reformed division method for reducing to appeared error by using Delaunay triangulation method that used to modify error of verified data. First, it is analyzed each vertices in hole error and classified follow case that is 1. case of plan or slope, 2. case of edge, 3. case of apex and 4. case of rapid curve, and reduced volume tolerance between original model and converted model after convert STL file.

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Generation STL File from SketchUp 3D Model (SketchUp 3D 모델로부터 STL 파일 생성)

  • Park, Woo-Young;Lee, Dong-Gu;Kim, Seong-Ki
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.997-999
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    • 2015
  • SketchUP은 최근 인기를 얻고 있는 3D 모델링 도구지만, 3D 프린터용 표준 파일 포맷인 STL을 지원하지 않는 단점이 있다. 본 논문에서는 SketchUp에서 만든 3D 모델(FBX)을 불러 와서 사용하고, STL로 변환할 수 있는 프로그램을 구현하는 방법을 논한다.

Implementation of 3D Animation using 3D Graphic SW(Blender) based on STL Files (3D 그래픽 SW(Blender)를 활용한 STL파일 기반의 3D 애니메이션 제작)

  • Kim, Jong-Jin;Kim, Jong-Seong
    • The Journal of the Korea Contents Association
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    • v.18 no.9
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    • pp.710-721
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    • 2018
  • In this study, we have suggested a method to create 3D animation based on STL files which are easily available on the internet using Blender, which is one of the most popular open-source 3D modeling SW. And the procedure of making 3D animation using STL file was compared with those for OBJ or FBX files as well. Contrary to OBJ and FBX, STL files do not contain information regarding hierarchy, material and texture which are very important in making 3D animation. Especially the absence of hierarchy may cause serious problems in rigging, which involves movement of unwanted parts of 3D object during rigging process. It is demonstrated that the weight painting feature of Blender could be a solution to tackle the faulty rigging due to attributes of STL files. The effect of the sampling frequency and the resolution on the rendering time is also investigated with respect to the 3D mantis animation. It is also seen that insect models by 3D printer could be used as a new type of pedagogical material in the elementary science education.

Triangle Based Geometric modeling for rapid Prototyping CAM system (고속시작 시스템을 위한 삼각형 기반 형상모델링)

  • 채희창
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.587-591
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    • 1996
  • Usually triangular patches are used to transfer geometric shape in Rpaid Prototyping CAM system. STL, a list of triangles, is de facto in RP industry. Because STL has no topology data, it can cause errornous results. So, STL should be verified before using. After adding support structures to anchor the part to the platform and to prevent sagging or distortion, slicing and layer by layer manufacturing process are done. But triangular patch is surface model and cannot provide dufficient information on geometry in the above processes. So, geometric modeling is necessary in verifying STL, adding support structures, and slicing. It is natural that triangle based modeling is the best when traingular patches are used as input. Considering support structures, solid and faces coexist in RP process. Therefore non-manifold modeler is required. In this study, triangle based non-manifold geometric modeling is proposed for RP system consitent with STL input.

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A study on conversion of cross-sectional information form STL file for Stereolithography (Stereolithography를 위한 STL파일로부터 단면정보 변환에 관한 연구)

  • 최홍태;김준안;이석희;백인환
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.445-450
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    • 1995
  • This paper deals with conversion from STL file to Slice cross-sectional information for Stereolithography. The STL file consist of three vertices of triangle and normal vectors in order to represent three dimension shape, but It is very difficult to convert STL file intoSlice file directly, because of file size from one Mbyte to tens of Mbytes. So, The system is accomplished data flow such as neutral.dat, .SL1, .SL2, .SL3, and .SLC file. The data processing is as follows: 1. Create a neutral file including common information. 2. Modify STL file within effective scope of SLA. 3. Calculate a point of intersection between plane equation and line equation. 4. Sort z values by increasing order. 5. Search closed loop by method of singlylinked linear list. The system is developed by using Borland C++ 3.1 compiler in the environment of Pentium PC. We get a satisfactory prototype as a result of application about a lot of household electrical appliances.

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