Free OpenGL Computer Graphics Questions and Answers

Question 1

What are a 3D transformation matrix's dimensions?

Accepted Answer

3x3

Answer

2x2

Answer

3x4

Answer

4x4

Question 2

In OpenGL, is it possible to specify the location of a light source?

Accepted Answer

Yes

Answer

No

Question 3

How can one revolve about a location other than the origin?

Accepted Answer

Translate to origin, rotate about origin, then translate back to original position

Answer

Rotations can only be performed around the origin

Answer

Perform a glRotate and specify the point to rotate around

Question 4

What stands for GLUT?

Accepted Answer

Opengl utility toolkit

Answer

Opengl graphics Library

Answer

Opengl utility library toolkit

Question 5

What is glMaterialf(...) used for?

Accepted Answer

Defines the material properties of a drawn object for visual effects

Answer

Switches to material mode to add visual effects

Answer

Turns material properties on

Answer

Gets the current material properties of a drawn object

Question 6

What makes glColor3d and glColor3f different from one another?

Accepted Answer

glColor3d takes double arguments, while glColor3f takes float arguments

Answer

glColor3d only sets RGB, while glColor3f sets R,G,B and A

Answer

glColor3d is in real space, glColor3f is in integer space

Answer

glColor3d allows 3d color operations, while glColor3f only allows 8-bit

Question 7

Which function specifies the vertex's color while illumination is off?

Accepted Answer

glColor()

Answer

glDisplayfunc()

Answer

glClearColor()

Answer

None of These