Visual Effects Visual Effects MCQ 3

Question 1

In fluid simulation, what does the term 'voxel' refer to?

Accepted Answer

A volumetric pixel representing a unit of space in a 3D grid

Answer

A voxel is the 3D equivalent of a pixel, representing a discrete unit of volume in a simulation grid.

Question 2

What is the primary purpose of an 'image-based light' (IBL) in 3D rendering?

Accepted Answer

To use an HDR panoramic image as a light source and environment reflection

Answer

IBL uses an HDR environment map to illuminate a 3D scene with real-world lighting captured in a photograph.

Question 3

Which technique is used to create the illusion of surface detail on a low-polygon mesh by altering surface normals?

Accepted Answer

Normal mapping

Answer

Normal mapping stores altered surface normal directions in a texture to fake fine surface detail without adding geometry.

Question 4

What is 'motion blur' in VFX, and which camera parameter most directly controls it?

Accepted Answer

The smearing of fast-moving objects, controlled by shutter angle/speed

Answer

Motion blur is the streaking of moving objects during exposure; shutter angle or shutter speed determines how much blur is captured.

Question 5

In Nuke compositing, what is the function of the 'Merge' node's 'screen' blend mode?

Accepted Answer

Inverts and multiplies layers so overlapping areas become brighter and never exceed white

Answer

Screen blend mode inverts both layers, multiplies them, then inverts the result — producing a brightening composite that never exceeds maximum value.

Visual Effects Practice Test