http://www.mrl.nyu.edu/~hertzman/hertzmann-intro3d.pdf
The method produced in this paper is almost straight forward, and can be viewed as marching triangle algorithm. We divide the image into triangular meshes and detect the contours which satisfy the condition the the dot product of the normal vector and view vector equals 0(for orthogonal projection). The paper also talks about the visiblity of the surface.
Advantages: Easy to program
Posted by: Yagneshwara Somayajulu Lanka
| @ August 12, 2006 10:41:39 PM CDT ( ) |
http://www.mrl.nyu.edu/~hertzman/hertzmann-intro3d.pdf
Comprehensible Rendering of 3-D shapes by Takafumi Saito & Tokiichiro Takahashi
Procedure: Image processing techniques are used for outline detection, rather than using line tracking process.
Images used: Normal map, and depth map. Techniques for crerating the maps are also described in the paper.
The method detects c0 and c1 discontinuities.
Adantages:
Rendering process can be divided into stages, and enhancement operations can be performed on 2D image to improve comprehensiblity.
Disadvantages:
Since we are using a 2D image rather than the 3D scene, important information may be discarded.
Also if we wish to change the attributes of the curves, or line qualities, then additional algortihms are required making the process complex.
Posted by: Yagneshwara Somayajulu Lanka
| @ August 12, 2006 10:24:54 PM CDT ( ) |
Recently, I was working on the various Non Photorealistic techniques.
The most recent paper has been Real time hatching, by Emil Praun, Hugues Hoppe, Matthew Webb, Adam Finkelstein.
Theme of the paper - Shading using Tonal art map(TAM). This paper talks about creation and applying TAMs to various figures to convey tone and material properties.
Posted by: Yagneshwara Somayajulu Lanka
| @ July 31, 2006 12:58:21 AM CDT ( ) |
This was my first task in the project, to learn the properties of superquadrics, which was completed succefully. Thanks to mr. Ketan Mehta who has provided various links to start with.
Useful links:
1. http://www.cs.mcgill.ca/~dudek/SQ/start.html
2. Nehe Production - OpenGL tutorials.
Posted by: Yagneshwara Somayajulu Lanka
| @ July 31, 2006 12:57:06 AM CDT ( ) |
I am Yagneshwara Somayaajulu Lanka, working with Dr. T.J. Jankun-Kelly, under the topic, Visulaization of Nematic liquid crystal using Non Photorealistic rendering techniques. This project is a continuation of the work done by Mr. Ketan Mehta, the only difference being that Mr. Ketan Mehta has worked on Photorealistic rendering part of the visualization.
Posted by: Yagneshwara Somayajulu Lanka
| @ July 31, 2006 12:55:30 AM CDT ( ) |
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