Introduction


  • This lesson will take you through adjusting Anti-aliasing filters using the V-Ray Render Settings
  • The information centers around the Image Sampler settings
  • This lesson topic is approximately 30 minutes in length
  • Lesson covers all 3 Learning Cycles for the Lesson Topic – Lecture, Demonstration, and Activity

 


  

Contents


Overview
Available Materials
Lecture
Demonstration
Activity
Additional Resources


Overview


Goal - This lesson will give you the necessary understanding of the different antialiasing filters in V-Ray and how to use them to smooth out your final renders.

Objective – We will learn how to adjust the Anti-Aliasing settings to our 3D scene to get better render results                          

Outcome – You will understand the different filter types available for Anti-Aliasing settings within V-Ray

 


 

Available materials


To set up the lesson follow the links below and download all available materials.

Lesson plan download
Presentation (Lecture) download
Demonstration tutorial download                                                           
Scenes & Assets download

 

Lecture



1. Terminology

Here’s some terms to be aware of when thinking about Image Sampling
  
a) Sampling
  • The act of gathering information from the rays to determine what each pixel will look like in the render
b) Anti-aliasing
  • A blending/blurring of pixel information based on sampling differences to produce a cleaner render particularly on diagonal/curved areas of a render, or where there is a difference in pixel colors/values
c) AA Filtering
  • A filter used when sampling an image to simplify the information that is traced back to the pixels in a render

2. Image Sampling


a) V-Ray Quick Settings

  • The Studio Setup preset is useful for product design visualizations (like our scene with the toy truck)
    • The Manage Presets allows you to save the current settings into the V-Ray presets file or to load a previously saved settings
    • The Settings buttons give you a quick way to jump to the render settings that apply to the area affected by the Quality sliders (GI, Shading, Anti-Aliasing)
  • To open Quick Settings, click its icon in the V-Ray shelf (shown below)
    • If you do not have the V-Ray shelf, enable it through the Render Settings window, Settings tab under the Vray UI heading by clicking Create/Replace V-Ray Shelf

  

  

  

  


b) AA Filters
  • Adds a filter effect to the anti-aliasing of the render
    • V-ray supplies eight types of Antialiasing filters: Box, Area, Triangle, Lanczos, Sinc, CatmullRom, Gaussian and Cook Variable
    • Each of those has advantages and disadvantages which make them useful for different tasks
    • Rendering with a particular filter is not the same as rendering without a filter and then blurring the image in a post-processing program like Adobe Photoshop
    • Filters are applied on a sub-pixel level, over the individual sub-pixel samples
    • Applying the filter at render time produces a much more accurate and subtle result than applying it as a post effect.

  

 


  • Area filter applies a slight blur to the image that is normally more pleasing than the Box filter

  

 

Shading Quality: 50%
AA Quality: 1-6 No AA Filter

Shading Quality: 50%
AA Quality: 1-6 Area AA Filter (default 1.5 Size)

 


  • Gaussian filter applies a stronger blur to the image to soften the edges

  

 

Shading Quality: 50%
AA Quality: 1-6 No AA Filter

Shading Quality: 50%
AA Quality: 1-6 Gaussian AA Filter (Size: 2.0)

 

 

  • Sharpening AA Filters
    • Lanczos filter applies a sharpening effect on the edges in the image
    • Can produce “moire” effects on detailed geometry

 

 

Shading Quality: 50%
AA Quality: 1-6 No AA Filter

Shading Quality: 50%
AA Quality: 1-6 Lanczos AA Filter (Size: 2.0)

 


Conclusion




a) Raytracing
  • The rendering technique used by V-Ray to shoot camera rays into the scene to gather info. and then trace their paths back to the pixel grid that makes up the final rendered image
b) Anti-aliasing
  • A blending/blurring of pixel information based on sampling differences to produce a cleaner render
c) AA filtering
  • An effect added to the anti-aliasing process to help improve the end result of the render                   

  


Demonstration



Time to see it work!

Watch while I demonstrate how to adjust the filter types for Anti-aliasing to get different rendering results.

Demonstration tutorial

  

               

 


Activity



Time to do it yourself!

Use the provided  scene file to get a better understanding of filtering Anti-aliasing.
  

  

Dialing in the right values

  • GI Preset to None
  • Shading Quality at 50%
    • Min Shading Rate: 32
  • AA Quality at 20%
    • Adaptive Min subdivs: 1
    • Max subdivs: 6
    • (noise) Threshold: 0.01
  • AA filter type: Lanczos
    • Size: 2.0

  


                                       

 

 

Additional resources


Find more training resources listed below: