Visual Effects Vocabulary 2 — Questions and Answers
Question 1: What does the term 'matte painting' refer to in VFX?
- A photorealistic background image used to extend or replace a set (Correct answer)
- A technique for removing objects using paint software
- A method of applying textures to 3D models
- A color grading pass applied after compositing
Correct answer: A photorealistic background image used to extend or replace a set
A matte painting is a photorealistic background image, traditionally painted and now often digital, used to create environments beyond what was filmed.
Question 2: In VFX, what is a 'previz'?
- A preview render with full-quality textures
- A pre-visualization rough animation used to plan shots (Correct answer)
- A proxy file format for offline editing
- A test composite using stand-in footage
Correct answer: A pre-visualization rough animation used to plan shots
Previz (pre-visualization) is a rough animated sequence created before production to plan camera angles, timing, and VFX shots.
Question 3: What does 'holdout matte' mean in compositing?
- A matte that reveals a layer beneath another
- A matte that blocks out a region to protect it from being affected by a layer (Correct answer)
- A background plate held from the previous shot
- A matte used for motion blur only
Correct answer: A matte that blocks out a region to protect it from being affected by a layer
A holdout matte blocks a specific region so that elements behind it are not affected by a foreground layer, preserving correct compositing order.
Question 4: What is 'ambient occlusion' in 3D rendering?
- The way light bounces off reflective surfaces
- A shading technique that simulates soft shadowing in crevices and contact points (Correct answer)
- The diffuse color of a surface under direct light
- A post-process effect that adds lens flares
Correct answer: A shading technique that simulates soft shadowing in crevices and contact points
Ambient occlusion simulates how much ambient light reaches a surface point, darkening areas like corners and creases to add depth and realism.
Question 5: What is a 'LUT' as used in VFX and color grading?
- A type of tracking marker placed on set
- A lookup table that maps input color values to output color values (Correct answer)
- A lens undistortion tool used in tracking software
- A UV unwrapping technique for organic shapes
Correct answer: A lookup table that maps input color values to output color values
A LUT (Look-Up Table) is a mathematical transformation that remaps color values, commonly used to apply grades or convert between color spaces.
Question 6: In motion capture, what is a 'retargeting'?
- Replacing a character's body with a different model after capture
- Transferring motion capture data from one skeleton rig to another (Correct answer)
- Re-recording a capture session with new actors
- Cleaning noise from raw mocap data
Correct answer: Transferring motion capture data from one skeleton rig to another
Retargeting applies motion capture animation data from the capture skeleton to a different character skeleton, adapting proportions as needed.
Question 7: What is 'photogrammetry' in VFX production?
- A method for generating realistic lighting from HDR images
- The technique of creating 3D models from multiple photographs of a real object (Correct answer)
- A process for measuring lens distortion on set
- A rigging technique based on bone weight painting
Correct answer: The technique of creating 3D models from multiple photographs of a real object
Photogrammetry uses overlapping photographs taken from multiple angles to reconstruct accurate 3D geometry and texture of real-world objects.
Visual Effects Vocabulary 2
What does the term 'matte painting' refer to in VFX?