Problems at shared vertices - modeling and rendering, Computer Graphics

Assignment Help:

Problems at Shared Vertices - Modeling and Rendering

Shading discontinuities can arise while two adjacent polygons fail to share a vertex which lies along their common edge. Identify the three polygons of figure 17, wherein vertex C is shared through the two polygons on the right, although not by the large polygon on the left. The shading information found directly at C for the polygons at the right will classically not be the same as the information interpolated at such point from the values at A and B for the polygon at the left.

155_Problems at Shared Vertices - Modeling and Rendering.png

Figure: Vertex C is shared by the two polygons on the right, but not by the larger Rectangular polygon on the left.

As an outcome, there will be a discontinuity in the shading. The discontinuity can be eliminated via inserting in the polygon on the left an extra vertex that shares C's shading information. We can pre-process a static polygonal database in sequence to eliminate this matter; conversely, if polygons will be split on the fly for example: through using the BSP-tree visible-surface algorithm, so extra bookkeeping can be finish to initiate a new vertex in an edge that shares an edge which is split.

773_Problems at Shared Vertices - Modeling and Rendering 1.png

Figure: Problems with computing vertex normal. Vertex normal are all parallel


Related Discussions:- Problems at shared vertices - modeling and rendering

Write a code to continuously rotate square about pivot point, Write a code ...

Write a code to continuously rotate a square about a pivot point.    #include   static GLfloat rotat=0.0;   void init(void); void display(void); void reshape(int w

Advantages of the z-buffer method, Advantages of the z-buffer method:      ...

Advantages of the z-buffer method:              1) The z-buffer method or algorithm is easy to apply and it needs no sorting of surface in a scene. 2) In z-buffer algorithm

Data set, In this project, the image data set consists of 320 training imag...

In this project, the image data set consists of 320 training images and 285 test images. Table 1 shows the image data set in details. In addition to the original images, th

Authoring tools in multimedia, Authoring Tools Authoring tools genera...

Authoring Tools Authoring tools generally refers to computer software that assists multimedia developers produce products. Authoring tools are various from computer programmi

Principle vanishing point - perspective projections, Principle Vanishing po...

Principle Vanishing point - Perspective Projections Assume that line 1 and l2 be two straight lines parallel to each other that are also parallel to x-axis. If the projection

What is fixed point scaling, What is fixed point scaling?  The location...

What is fixed point scaling?  The location of a scaled object can be controlled by a position known as the fixed point that is to remain unchanged after the scaling transformat

Color histogram, A color histogram is a representation of the distribution ...

A color histogram is a representation of the distribution of colors in an image. For digital images, a color histogram represents the number of pixels that have colors in each of a

Differentiate between raster and vector images, QUESTION a) Differentia...

QUESTION a) Differentiate between raster and vector images. b) Explain the concept of bit depth. What is the minimum number if bits required for a one-colour digital image t

What is rotation, What is rotation?  A 2-D rotation is completed by rep...

What is rotation?  A 2-D rotation is completed by repositioning the coordinates with a circular path, in the x-y plane by making an angle with the axes. The transformation is g

Magnify a triangle with vertices, Magnify a triangle with vertices A = (1,1...

Magnify a triangle with vertices A = (1,1), B = (3,1) and C = (2,2) to twice its size in such a way that A remains in its original position.  Answer: You need to apply scaling b

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd