Introduction


  • This lesson will take you through setting up a render with a scene featuring a moving object
  • The information centers around setting up the render 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                                             


Overview


 

Goal - Set up the correct render settings for a scene with a moving object

Objective – We will set up a render of the animated scene                                   

Outcome – You will be able to render out a scene with animated objects

 

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 are some terms to be aware of when thinking about rendering animated objects

  • Image Sampler
    • An image sampler refers to an algorithm for sampling and filtering the image function, and producing the final array of pixels that constitute the rendered image.
  • Camera path
    • The path a camera travels along
  • Global Illumination
    • How light is bounced off of surfaces onto other surfaces via indirect light rather than being limited to just the light that hits a surface directly from a direct light source.
  • Antialiasing
    • Antialiasing is the smoothing of the image or sound roughness caused by aliasing . With images, approaches include adjusting pixel positions or setting pixel intensities so that there is a more gradual transition between the color of a line and the background color.

  

a) Moving objects in the real world

  • Moving Objects
    • Lighting will change as an object moves
    • A car driving along a street will hit both areas of light and shadow.

  

 


b) Light Interaction with Moving Objects

Light interaction with a moving object

  • A person walking from outdoors to indoors
    • Transitions from outdoor to indoor lighting scheme with changes of light and shadow interacting with the person
  • A space ship crashing into a city
    • Lighting from the sky, then before it hits the ground  / a building in the city shadows and caustics could appear as a result of  the different lighting at ground level in a city to that in the sky.
  • A dolphin jumping out of the water
    • A transition from underwater lighting to the sunlight above the surface of the water

 

2. Animated Object Render Settings


Animated Object Render Settings Overview

  • We cannot use pre-calculated (baked) Light Maps
    • The only solution is to use an accurate GI solution combination
  • Choices of Primary and Secondary Bounce engines
    • Brute Force (primary) Light Cache (secondary)
    • Brute Force (primary) Brute Force (secondary)

 

 


3. V-Ray Quick Presets


V-Ray Quick Presets Overview

  • Allows quick selection of presets
  • Icon is found on the V-Ray shelf
  • Select the ‘ArchViz Exterior’ preset
  • Leaving the GI Preset to BF + BF is most accurate, but at a cost of render time
    • This sets both Primary and Secondary Engines at Brute Force
  • Changing the GI Preset to BF + LC (accurate)
    • This sets your Primary Engine to Brute Force and Secondary Engine to Light Cache
    • This combination gives a good combination of lighting accuracy and render speed
  • AA Quality controls the AntiAliasing quality of your render, not the quality of the GI. However, AA Quality will help greatly reduce noise. 50% is a good value generally

 

 

 

4. Setting up the GI Engines


 a) Setting up the GI engines

  • Set GI Quality
  • Click on Settings button to open your GI Settings to access finer GI controls/settings

 

 


b) Reducing noise when using Brute Force for both engines
  • Brute Force is easy to control, as its noise settings are controlled by Subdivs
  • Setting of 8 is usually a good starting point
  • AA Quality in the Quick Settings can also help mitigate Brute Force noise

 

 



 


  • The higher the Subdivs, the cleaner the image, at a render time cost
  •  Lower Sample Sizes need higher Subdivs but give more detail in the image
 

c) Reducing flickering when in Light Cache (Single Frame Mode) for animations
  • Use camera path option – Calculates the light cache samples along the path of the camera as opposed to just the current view
    • Useful when rendering animations with moving objects and a moving camera. Will help to reduce any flickering, because the GI samples on static geometry will not change
    • This greatly reduces any flickering in the GI that comes from the secondary bounce rays, especially on the non-moving parts of the scene

 

 

5. Reducing Noise


  • Use AA filtering in the Vray tab of the Render Settings to reduce some noise
  • Some filters/settings may soften the image slightly, especially at higher Size values
  • A good general setting is the AA filter type Gaussian with a Size between 1.8 and 2.2

 

 

6. Rendering the Final Animation


  • Make sure you are in the Output
  • In the Image File Output rollout specify a File Name Prefix
  • Disable Don’t save image (ignore in batch mode)
  • In the Animation rollout switch animation parameter to Standard
  • Set the Start and End Frame values
  • Start a batch render!

 

 


Conclusion



a) Lighting changes when an object is moving
  • How it hits and interacts with the surface
b) How we can help reduce flicker with Brute Force
  • By using the Subdivs
  • AA Quality
c) How we can help reduce flicker with Light Cache
  • By using the Use camera path option
d) How we can help reduce image noise in the render
  • By changing the AA filter type
e) Rendering out the final animation                                         
  • Rendering it out to a sequence

 


Demonstration



Time to see it work!

Watch while I demonstrate how to Set up the render setting, Primary and Secondary bounces, Reduce noise and flicker and render out the final sequence.

 

                     

 


Activity



Time to do it yourself!

Use the provided scene file to set up the scene as shown to render out flicker and noise free for the full sequence.
We have also provided a final scene for your reference.

 

 


Dialing in the right values

  • Check Use camera path in the Light Cache roll out of the GI tab of the render settings
  • Set AA filter  type to Gaussian in the Image Sampler roll out of the VRay tab of the render settings
  • In the VRay Common Tab specify the  File Name Prefix and disable  Don’t save Image (ignore in batch mode)
  • In the Animation roll out switch the Animation parameter to Standard and set the end frame to 200