scholarly journals Per-Pixel Extrusion Mapping with Correct Silhouette

2021 ◽  
Vol 22 (3) ◽  
Author(s):  
Adnane Ouazzani Chahdi ◽  
Anouar Ragragui ◽  
Akram Halli ◽  
Khalid Satori
Keyword(s):  
Ray Tracing ◽  
Quadratic Approximation ◽  
Curved Surfaces ◽  
Surface Geometry ◽  
3D Mesh ◽  
3D Surface ◽  
Mapping Techniques

Per-pixel extrusion mapping consists of creating a virtual geometry stored in a texture over a polygon model without increasing its density. There are four types of extrusion mapping, namely, basic extrusion, outward extrusion, beveled extrusion, and chamfered extrusion. These different techniques produce satisfactory results in the case of plane surfaces, but when it is about the curved surfaces, the silhouette is not visible at the edges of the extruded forms on the 3D surface geometry because they not take into account the curvature of the 3D meshes. In this paper, we presented an improvement that consists of using a curved ray-tracing to correct the silhouette problem by combining the per-pixel extrusion mapping techniques and the quadratic approximation computed at each vertex of the 3D mesh.

Ray-tracing calculations for uniaxial optical components with curved surfaces

1991 ◽  
Vol 30 (31) ◽  
pp. 4521 ◽  
Author(s):  
Quan-Ting Liang ◽  
Xian-Dong Zheng
Keyword(s):  
Ray Tracing ◽  
Curved Surfaces ◽  
Optical Components

scholarly journals CONSISTENT MULTI-VIEW TEXTURING OF DETAILED 3D SURFACE MODELS

2015 ◽  
Vol II-3/W4 ◽  
pp. 25-31 ◽  
Author(s):  
K. Davydova ◽  
G. Kuschk ◽  
L. Hoegner ◽  
P. Reinartz ◽  
U. Stilla
Keyword(s):  
Large Scale ◽  
Texture Mapping ◽  
Aerial Images ◽  
Field Energy ◽  
Multiple Camera ◽  
3D Surface ◽  
Surface Models ◽  
Mapping Techniques ◽  
3D Scene ◽  
High Degree

Texture mapping techniques are used to achieve a high degree of realism for computer generated large-scale and detailed 3D surface models by extracting the texture information from photographic images and applying it to the object surfaces. Due to the fact that a single image cannot capture all parts of the scene, a number of images should be taken. However, texturing the object surfaces from several images can lead to lighting variations between the neighboring texture fragments. In this paper we describe the creation of a textured 3D scene from overlapping aerial images using a Markov Random Field energy minimization framework. We aim to maximize the quality of the generated texture mosaic, preserving the resolution from the original images, and at the same time to minimize the seam visibilities between adjacent fragments. As input data we use a triangulated mesh of the city center of Munich and multiple camera views of the scene from different directions.

Solving the Inverse Problem of Recovering the 3D Surface of a Detail According to its 2D Projections in the Modelling of Electroplating Processes

2021 ◽  
Vol 1037 ◽  
pp. 581-588
Author(s):  
Inna A. Solovjeva ◽  
Denis S. Solovjev ◽  
Yuri V. Litovka
Keyword(s):  
Inverse Problem ◽  
Coating Thickness ◽  
Nickel Coating ◽  
Problem Solution ◽  
Surface Geometry ◽  
Inverse Problem Solution ◽  
Geometric Problems ◽  
Solution Algorithms ◽  
Logical Operations ◽  
3D Surface

The article considers the influence of the surface geometry of a detail on the deposition of coating thickness in the simulation of electroplating processes. The methods for obtaining sets of points describing the surface of a detail are analyzed. Solving the inverse problem (recovering the 3D surface of a detail according to its 2D drawings) is the most promising method. The inverse problem solution is decomposed into simpler geometric problems: input data processing; obtaining primitives; obtaining the desired surface of a detail by applying logical operations to primitives. Mathematical statements are formulated and solution algorithms are proposed for solving these problems. The inverse problem solution is implemented through software. The distribution of the nickel coating thickness is shown for a detail, the surface of which is obtained by solving the inverse problem.

Implementation of Reflection on Curved Surfaces and Physical Optics in Ray Tracing for Tunnel Propagation

2013 ◽  
Vol E96.C (1) ◽  
pp. 42-50
Author(s):  
Yukiko KISHIKI ◽  
Jun-ichi TAKADA ◽  
Gilbert Siy CHING ◽  
Hajime TAKAO ◽  
Yoshihiro SUGIHARA ◽  
...  
Keyword(s):  
Ray Tracing ◽  
Physical Optics ◽  
Curved Surfaces

Research of the Image-Based Fast Design for 3D Toys and Cartoons

2010 ◽  
Vol 102-104 ◽  
pp. 45-49
Author(s):  
Jin Wang ◽  
Guang Yu Zhu ◽  
Guo Dong Lu ◽  
Gang Chen ◽  
Dong Liang Zhang
Keyword(s):  
3D Models ◽  
Local Deformation ◽  
Target Color ◽  
Control Points ◽  
3D Mesh ◽  
Modeling Methods ◽  
3D Surface ◽  
Interpolation Curve ◽  
Symmetric Deformation ◽  
Tracing Algorithm

This paper takes the 2D image of toys and cartoons as reference to assist the amateurs to design 3D models fast and conveniently. A contour deep tracing algorithm is proposed for acquiring the whole contour, and Ferguson interpolation curve is introduced to fit the contours. Taking the control points of Ferguson curves as reference, amateurs can easily sketch curves that fit to the image contours. Decomposing the extracted contours into several feature regions, the users can draw some enclosed component contour curves of the target toys or cartoons, and then adopt proper methods to generate the 3D mesh of components. Three modeling methods, namely local deformation, symmetric deformation, and 2D FFD deformation, are introduced for modeling the 3D surface fast. Ferguson curves are also used in 3D painting on triangular surface, and large regions enclosed by the painted colors can quickly be filled with a target color. The users select a region of the image and drag them onto 3D models, and then the details, such as eyes, nose, and artistic patterns can be easily painted.

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