ACE Surface Modeling & Mesh Editing 3 — Questions and Answers
Question 1: In Fusion 360's Form (T-Splines) environment, what happens when you 'Weld Vertices'?
- Creates a sharp crease between two edges
- Merges two nearby vertices into a single vertex (Correct answer)
- Splits a face into multiple smaller faces
- Adds a new vertex at the midpoint of an edge
Correct answer: Merges two nearby vertices into a single vertex
Weld Vertices merges two nearby T-Spline vertices into one, closing gaps and connecting separate mesh regions.
Question 2: Which surface creation command in Fusion 360 generates a surface by sweeping a profile along a path?
- Revolve
- Sweep (Correct answer)
- Loft
- Extrude
Correct answer: Sweep
The Sweep command creates a surface by moving a profile curve along a defined path curve.
Question 3: What is the effect of enabling 'Smooth' display mode versus 'Box' mode in the Form workspace?
- Smooth mode shows the control cage; Box mode shows the final T-Spline surface
- Box mode shows the control cage; Smooth mode previews the final smoothed T-Spline surface (Correct answer)
- Smooth mode adds more geometry automatically
- Box mode locks the geometry from editing
Correct answer: Box mode shows the control cage; Smooth mode previews the final smoothed T-Spline surface
Box mode displays the control cage polygon mesh, while Smooth mode previews the final smooth T-Spline surface that results from subdivision.
Question 4: When importing a mesh file (OBJ or STL) into Fusion 360, which workspace is used to edit the mesh directly?
- Sculpt
- Model
- Mesh (Correct answer)
- Manufacture
Correct answer: Mesh
The Mesh workspace in Fusion 360 is specifically designed for importing and editing mesh bodies from OBJ, STL, and other mesh formats.
Question 5: The 'Thicken' command applied to a surface body produces what type of result?
- A solid body with uniform wall thickness (Correct answer)
- A new offset surface parallel to the original
- A mesh body with triangulated faces
- A T-Spline body ready for further sculpting
Correct answer: A solid body with uniform wall thickness
Thicken adds material to a surface body by offsetting it and connecting the edges, producing a solid body with the specified wall thickness.
Question 6: What is a 'degenerate face' in a mesh, and why is it problematic?
- A face with more than 6 edges, causing rendering artifacts
- A face with zero or near-zero area that can cause mesh errors and conversion failures (Correct answer)
- A face that is not planar, causing shading issues
- A face that is fully interior and has no boundary edges
Correct answer: A face with zero or near-zero area that can cause mesh errors and conversion failures
A degenerate face has zero or near-zero area (often caused by coincident vertices), which can cause errors during mesh-to-BRep conversion and manufacturing.
Question 7: Which command in Fusion 360 allows you to create a surface through a network of intersecting curves arranged in a grid pattern?
- Boundary Fill
- Network Surface (Patch from curves) (Correct answer)
- Loft
- Fill
Correct answer: Network Surface (Patch from curves)
A Network Surface (or network patch) creates a surface that passes through a grid network of intersecting curves in both U and V directions.
ACE Surface Modeling & Mesh Editing 3
In Fusion 360's Form (T-Splines) environment, what happens when you 'Weld Vertices'?