UNIT IV RENDERING

1. What is meant by Rendering?

In 3D graphics rendering means the calculation of the final image from the scene that includes models, textures, lights, special effects and cameras. The final image will be 2D image made of pixels. Utilizing materials, lighting techniques, and renderer’s settings one can render multitude of different images from a single 3D scene.

2. Types of Rendering?

 Realistic rendering Clay Rendering Wire Rendering

3. Purpose of Wire Rendering.

The purpose of wire rendering is to reveal the polygon structure of the model. Wire rendering displays only edges of the polygons. Wire render and clay render are often combined.

4. Write the syntax of smooth shading.

Syntax:

glshadeModel(GL_smooth);

It calculates the color at each vertex.

It produces much better image.

It computes during scan conversion.

5. List out the drawbacks of shadow mapping.

• Aliasing especially when using small shadow maps.

• The scene geometry must be rendered once per light inorder to generate the shadow map for a spot light.

UNIT IV RENDERING

1. List the advantages of flat shading?
 inexpensive to compute Appropriate for objects with flat surface Less pleasant for smooth surfaces.

2. What are the methods of shading?
 Circulism Blended Circulism Dark Blacks Loose cross Hatching Tight cross Hatching Powder Shading

3. What is the UDC technique
UDC stands for User Defined Character set.It is graphics animation trick which used in early microcomputer system.

4. List the advantages of shadow mapping?
No knowledge or processing of the scene geometry is required. Only a single texture is required to hold shadowing information for each light. Avoids the high fill requirement of shadow volume.

5. What is computer graphics realism
The creation of realistic picture in computer graphics is known as realism.It is important in fields such as simulation,design,entertainments,advertising,research,education,command and control.