OpenGL OpenGL Transformations and Matrices

Question 1

Which matrix transforms vertices from world space into camera (eye) space?

Accepted Answer

View matrix

Answer

The view matrix represents the camera's position and orientation, transforming world-space positions into eye space.

Question 2

What is the purpose of a projection matrix in the OpenGL pipeline?

Accepted Answer

Maps eye-space coordinates to clip space, defining the view frustum

Answer

The projection matrix encodes perspective or orthographic projection, mapping the view frustum to the canonical clip volume.

Question 3

In OpenGL, what coordinate system results after dividing clip coordinates by the w component?

Accepted Answer

Normalized Device Coordinates (NDC)

Answer

The perspective divide (dividing x, y, z by w) converts clip coordinates to NDC, which range from -1 to +1 on each axis.

Question 4

Which transformation is used to move an object to a specific position in world space?

Accepted Answer

Translation

Answer

Translation shifts the origin of an object by adding an offset to its coordinates, repositioning it in world space.

Question 5

In OpenGL, matrices are stored in which memory order?

Accepted Answer

Column-major order

Answer

OpenGL uses column-major storage, so the first four floats of a mat4 represent the first column, not the first row.

OpenGL Practice Test