OpenGL Basics and Rendering Pipeline

What does OpenGL stand for?

• Open Graphics Library

• Online Graphics Library

• Open Game Library

• Open Graphics Language

Name the stages of the OpenGL rendering pipeline.

• Input Processor, Output Processor, Texture Processor, Lighting Processor

• Vertex Specification, Vertex Shader, Tessellation, Geometry Shader, Fragment Shader, and Rasterizer

• Vertex Processor, Fragment Processor, Rasterizer, Output Merger

• Vertex Shader, Pixel Shader, Texture Mapping, Z-Buffering

What is the purpose of the Vertex Shader in the OpenGL rendering pipeline?

• To apply textures to the 3D model

• To calculate lighting effects on the 3D model

• To handle user input for the 3D model

• To process each vertex of a 3D model before rendering.

Explain the role of the Fragment Shader in OpenGL rendering.

• The Fragment Shader is responsible for rendering 3D models in OpenGL.

• The Fragment Shader processes individual fragments to determine their final color based on lighting, texturing, and shading calculations.

• Fragment Shader determines the position of vertices in OpenGL rendering.

• Fragment Shader is used for handling user input in OpenGL.

How does OpenGL handle depth testing in the rendering pipeline?

• Depth testing in OpenGL involves comparing fragment color with depth buffer and updating accordingly.

• OpenGL does not support depth testing in the rendering pipeline.

• Depth testing in OpenGL is handled by directly setting the depth value for each fragment.

• Depth testing in OpenGL involves comparing fragment depth with depth buffer and updating accordingly.

What is the function of the Rasterization stage in OpenGL?

• Converts geometric primitives into pixels on the screen

• Generates 3D models from 2D images

• Handles user input for interaction

• Applies lighting effects to the scene

What are some common primitive types used in OpenGL rendering?

• circles

• hexagons

• squares

• points, lines, triangles, quads

What does Open GLSL stands for?

• Graphics Library of Shell Languages

• Geographic Land and Survey Library

• Graphics Library of Shader Language

• Graphical Langauge and of Shader Library

Which function specifies the color of the vertex?

• glClearColor()

• glDisplayFunc()

• glColor()

• None of the above

glVertex() is used to draw OpenGL primitives.

• True

• False