3D Product 3D Modeling Fundamentals 3

Question 1

What is 'retopology' in 3D product design workflows?

Accepted Answer

The process of rebuilding a high-poly mesh with clean, optimized low-poly geometry

Answer

Converting a polygon mesh to NURBS surfaces

Answer

Creating LOD versions for game engines

Answer

Applying subdivision smoothing to a mesh

Question 2

In 3D modeling software, what is a 'reference image' or 'image plane' used for?

Accepted Answer

A background image placed in the viewport to guide accurate modeling

Answer

A texture projected onto a 3D surface

Answer

A rendered preview of a scene

Answer

A UV map displayed in the UV editor

Question 3

What is the difference between parametric and polygonal modeling?

Accepted Answer

Parametric modeling uses editable parameters for precise dimensions; polygonal modeling directly manipulates vertices and faces

Answer

Parametric modeling uses more polygons; polygonal uses fewer

Answer

Parametric modeling is only for organic shapes; polygonal is for hard surfaces

Answer

There is no practical difference between the two

Question 4

What does 'watertight' mean when describing a 3D model intended for 3D printing?

Accepted Answer

The mesh has no holes or open edges — it fully encloses a volume

Answer

The model has been optimized for smooth surface rendering

Answer

The geometry has been scaled to real-world units

Answer

The model has no overlapping faces

Question 5

What is 'ambient occlusion' and why is it important in 3D product visualization?

Accepted Answer

A shading technique that darkens areas where light is blocked by nearby geometry, adding depth and realism

Answer

A type of camera projection used in product shots

Answer

A UV packing method that reduces texture seams

Answer

A rendering mode that removes all lighting

Question 6

In 3D product design, what is a 'chamfer' used for?

Accepted Answer

To create an angled cut or bevel at the edge of a model to soften sharp corners

Answer

To merge two separate mesh objects into one

Answer

To increase the polygon density of a surface

Answer

To apply a procedural texture to an edge