Problems at shared vertices - modeling and rendering, Computer Graphics

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

Posted Date: 4/5/2013 3:53:22 AM | Location : United States

Related Discussions:- Problems at shared vertices - modeling and rendering, Assignment Help, Ask Question on Problems at shared vertices - modeling and rendering, Get Answer, Expert's Help, Problems at shared vertices - modeling and rendering Discussions

Write discussion on Problems at shared vertices - modeling and rendering
Your posts are moderated
Related Questions
Spline curve - Modeling and Rendering Spline curve is created by using Control points that control the shape of the curve Spline curve is a composite curve formed along with s

what are three features to use to create your flyer to market?

Approaches to Area Filling  Some other approaches to area filling are   Scan line polygon fill algorithm Boundary fill algorithm Flood fill algorithm.

Archeology: along with the advent of the computer, the archeologist has obtained a new tool, computer animation. An object-model can be made comparatively quick and without any we

Essential Elements for the Raster Scan Display Three elements are essential for the raster scan display. They are as: 1) The Frame Buffer that is also termed as the Refresh

3D Primitive and Composite Transformations Previously you have studied and implemented 2D geometric transformations for object definitions in two dimensions. These transformati

Panning and zooming Components (such as your Polybounce or Animation) is simply a matter of reFrameing the world window. To pan right or left horizontally, one shifts it in the pos

Advantages and Deficiencies of Gourand Shading Advantages of Gourand Shading: this eliminates the intensity discontinuities related with the constant shading model. Defi

Polygonal Meshes - Clipping and 3D Primitives Apart from polygonal surfaces, polygonal meshes are also used extensively in 3D geometric modelling.A mesh is essentially a polyg

What is a Blobby object?  Some objects do not handle a fixed shape, but change their surface characteristics in sure motions or when in proximity to other objects. That is call