Sunday, October 27, 2013

Week 6 - (Light Rig Base)

For this week my goal was to actually produce an initial light rig. This rig would be able to simulate morning, midday, evening and night. From what I had known about light already in Maya and in real life I had originally seen this an average task for the time I had. The problem was that I had just assumed certain things could be done when I hadn't fully experimented with them at all. This being shadows.

I started by drawing out some schematic light diagrams for what I assumed may have been a good plan. It worked out in theory and was able to translate as expected. It wasn't till I tried experimenting with Physical sun and sky did things start to go sour.


The main reason I used this is that it had already useful attributes for environmental lighting. Through this I would adjust things accordingly as well as tweaking colours and adding extra lights. This would work fine in theory but when I tried it I hit a brick wall.

I have NO idea how to manipulate shadows.

Changing the time of day and the actual softness were the only ways I figured out how you could manipulate shadows. This was bad very bad. After days of attempts and playing with everything I still couldn't figure this out. It was important that I did as I was getting light bluey shadows that had physical sun and sky written all over it. Without the ability to control shadows properly I couldn't continue. I stopped the experiment and went with failure.


As far as my skill set is right now I feel that I unfortunately have to call a bust on physical sun and sky. It’s probably better too as being able to create my own light rig manually allows for more control and is still usable if I chose to switch to different renderers.

Directions I could take for future experiments may involve working with lights individually. I may also be directed to see the impact of how different shaders/mip nodes may influence. Could a shader have fixed my shadow problem?

For next week I may have to alter the learning contract to accommodate for the fact that I haven’t finished an actual rig. Combining weeks together (like seasonal and create light weeks) may bring me back to where I need.         

Monday, October 21, 2013

Week 5 - (Fundamentals)

To recap on last week, I was testing out different light sources of Maya and experimenting with their attributes. From it I was able to get a basic understanding of how different lights work in Maya. 

This week’s focus was on the actual theory behind lighting and light rigging itself. Rather than just focusing on CGI lighting I chose to look into other forms of media. This included; film, photography and even old paintings as lighting had been a thoroughly researched topic in these fields. Not to mention they were using actual light that gave natural results (rather than just programed).

The actual challenge is trying to create believable lighting within the capabilities of Maya. It much simpler to have bad lighting in a computer program than it is real life. Some things can easily just be seen as ‘out of place’, ‘too bright’ etc. A knowledge of how real lighting works can be transferred to Maya and give believable results that are replicated in real life. There are advantages and disadvantages through the program but for now my focus is on observation. 

Factors of good lighting

"Good lighting is important for quality video in three different ways: exposure. Illusion of depth and mood/feeling", (Jackman, 2010)

This was probably the more basic way of summing up production lighting that I understood. The three factors it address’s (exposure, illusion of depth and mood/feeling) are all needed when setting up shots.

Exposure is the visibility of a shot. How lit the overall areas of the shot are and what details and forms are shown. Having not enough exposure on a shot causes dark hard to read visuals, whilst over exposure blows out whiteness. 

Illusion of depth is simulating 3D space within an environment. Even though a camera can capture real life, the actual viewing of the material is only in a 2D surface. Having depth in a scene tricks the viewer into thinking (or rather reinforcing) there is depth in the shot. 

Mood and feeling help give a soul/deeper meaning to the shot. This could be highlighting something or telling us something about the character/object. Having this brings a shot out of realism and more into creative, artistic and semiotic communication.   

Lighting in traditional work  

To start initial research on light I looked into old paintings that had a direct demonstration in the subject of light. It was an interesting direction to take the research as light was being understood in art before film and photography. The Painting that I ended up looking at was Claude Monet's series of haystacks. From looking at the pictures there is a rapid change in the tone and colour. The haystacks are basically the same but painted at different times of day and weather. What can be learned from this is the dramatic changes natural lighting can have on objects. How the different lighting can give off alternate moods and behaviors.  

Lighting Rigs

High key lighting
High key lighting is a two light set-up of both a key light and a fill light. They both are angled in the front of the shot with the fill light having near the same intensity as the key. This results in everything being evenly lit and at a higher intensity. With the extra dimension of colour forms are separated and readable (unless if you are colour blind). The advantage behind this system is that it is simple and it works. The negative is that it creates a wash of light that makes shots look flat and is bland.  

3 point light system

Out of all the research I was able to do for this week the 3 point light system seemed to be the most commonly written about light rig. Though you couldn't really blame it considering of how much of a effective staple it is to lighting. It order to produce the 3 point light system you place a light angled on one side of the camera focusing on the asset/area. This is the dominate light source and is known as the key light. On the other side of the camera is another light but with much less intensity. The light, known as the fill light, exposes the areas which the key light would leave in darkness. Having the light at less intensity creates light tone and contrast that helps bring out details. Finally the is a light placed at the back of the asset/area. With the light, or rim light, protruding off, the asset/area creates a highlight that helps give a sense of depth within the shot.  

Light bounce

This isn't so much of a rig as it is a technique. When we have an existing 3 point light system an extra key and fill light can be added to control bounced light on an object. The secondary lights will be in line vertically with their duplicates and have greatly lowered intensity. This adds brightness to the lower part of an object simulating light that has bounced from the ground. A slight change but a definitely noticeable adjustment.

Building light plans

When it comes to lighting for environments it's a good idea to produce a draw plan first of where the lights may go/where you need lighting. 

Unfortunately I couldn't exactly find any kind of formulaic environment light rig. However with the varied location choices it would only seem silly for there to be a one all rig for environments. I did however find a process in developing them. 

 Primary light source - Add lights and attributes of those lights that would come naturally to the shot being created. This would be though sunlight or artificial light, like lamps.  

Lights focused on active areas - Giving extra or special consideration for lighting where the actual action may take place. If the camera is focusing on a character, they should have more lighting focus to them. 

Lights to expose and give depth - Creating a focal point to expose  then adjust the rest of the shot according. 

Set lights properly - Basically as it says. placing the lights that have been planned.

Watch shadows - Have control over the shadows. Make sure no odd shadows are intersecting weirdly with the action of the shot. A shadow is a form.

Accent lighting, interesting light structure - Breaking up spaces with lights and shadows to create more interesting visuals.

Fill lights - Filling up all the darkness that would be otherwise caused by the original key lights.  
Shadows giving sense of depth - Manipulating shadows whether it be adjusting for more realism or creative lighting.

Eliminate hot spots - Areas that may have a fairly strong lit area that are out of place in the shot. The previous steps reduce that happening. However if there is movement in the scene the lights may need to be adjusted accordingly.

This is obviously more focused towards film production , however the techniques themselves transfer directly to CGI.

Other useful stuff I discovered whilst researching light
Barn doors - controls aperture of light
Mirror ball - shows overall lighting of scene

Probably finishing this on a rough note but for some reason I writing too much from what I have intended. There has just been so much information to learn. I could probably adjust the scope of the research but I still really want to focus on efficient environmental light rigging.

Jackman, J.(2010). Lighting for Digital Video and Television. (3rd edition).Oxford, UK: Focal Press
Parrish, David A.(2002). Inspired 3D lighting and compositing. (1st edition).Great Britain : Premier Press
Unknown. (2013). Turner to Monet. [Online] Available [October 22nd 2013]


Ashton, K. (2011). Studio Lighting Techniques. [Online] Available [October 27th 2011]
Ball, A. (Producer), & Mendes, S. (Director).(1999). American Beauty [Motion picture]. American: Dreamworks.
Feringa, B. (2013). Bert Feringa Blog. [Online] Available [March 29th 2013]
Unknown. (2012). Light Your Video. [Online] Available [May 4th 2012]

Tuesday, October 15, 2013

Week 4 - (Maya Lights)

As part of achieving an overall understanding of lighting I naturally wanted my initial experiments to be just focused on fundamentals. For this week my goal was to explore the effects of the six Maya lights and how they worked uniquely within the program. As A bonus I also looked into some specialised lighting attributes. The outcome of the actual goal was to hopefully help me get a better understanding of lights, and how I could best use them to build an environmental light rig. 

In preparation I checked out a DVD on lighting effects. From it I was able to drag out certain aspects of lighting attributes that I had not thought of. This included the knowledge of caustics, producing unique shadows from light mapping and optical effects (ie, lens flare). I also learnt about IPR Rendering.  


The main focus on producing accurate results for the testing was to create a control scenario. My original intention was to use both the Environmental Park and Refinery in order to use for the testing. The problem with this was mainly the Ludacris nature of using an entire environment to get the effects on one light. The space may have not given an accurate result and could have been hard to read. This being said I never actually allowed myself time to test this, but was already happy with the testing area I created. Though in all future experiments the actual control environments will be used.

Default Lighting

Part 1
The Control environment I used to host the lighting was a simple inversed cube. The lights used would always be set up in the same position unless otherwise (ie, volume light). Each light would emit against a corner area and show 3 examples with different attributes.          

The following information is derived from subjective observations and read information.

Ambient – This felt like an extremely tinted light source that filled everything evenly. It had a sense that it could control the overall visibility of an environment and possibly the temperature as well. Ambient shade gave a strong sense of an AO like effect and adding appealing contrast.   

Directional – Did not really have that many adjustable attributes and might seem limited in terms of use by itself. With the combination physical sun and sky the directional light produces new attributes to help it become more controlled and varied.  

Point – Having a light source that can produce light from within a center point can probably be used for artificial light sources and for creative lighting. The distance for a point light isn’t that limited. Having decay helps remove distant Omni lighting that would give similar effect to an ambient light.   

Spot – Spot lights can help highlight particular areas and bring out a focal point. The cone angle adjusts the size of the circular light shape. Penumbra effects the edge softness of the light shape. Drop off effects the decay of the light shape.   

Area – Projects a 2D light shape depending on the size and shape of the light. Has a strong drop off that requires a higher intensity for visibility. 

Volume – Produces soft light depending on the scale and shape. The penumbra can be directly manipulated via liner and quadratic graphs. This allows the fall off and edge softness to be more controllable.  

Part 2
This part of the experiment will focus more on the extra effects that are produced within light attributes. As a control for this the same cube will be used and a spot light will be demonstrating the effects (unless otherwise). To also get a sense of a scene, primitives have been placed. The actual details of the lights attributes (the controlled ones) can be seen in Light Chart 2. 

 The following information is derived from subjective observations and read information. 

Area Light – Produces appealing lighting and shadows. Dependant on the amount of high and low samples. Shadow mapping can also be altered with its sampling adjusted. More in depth research probably needs to be applied here as technical understand of light and sampling seems to be its focus. Also takes a bit of effort to render as increased sampling increases render time.  

Light Effects – Used to create different kinds of optical effects that are the subject of lens reflection/refraction (i.e. lens flare). Is produced by having a point light on camera and set to have ‘illuminates by default’ turned off. More of an effect that can come into play with establishing time of day with environments. Extremely customisable to appropriate with the kind of camera that might be used. For some reason it only works in Maya renderer and not Mental ray. 

Light Mapping – Simply applying a file onto the light map. Can create interesting shadow effects as well as caustic effects. 

Overall the main things that were leant was the breakdown of light attributes and how certain lights effect areas differently. With the understanding of this information more effective and educated decisions can be made in development of environmental lighting rigs. There have been a few things during this experiment (i.e., area lights) that I have had some uncertainty about. However I going strive to continue to pick up other light features that I may not have figured out.


Hackett, D. (2012). Area Lights 101. [Online] Available [October 16th 2013]

Naas, P. (2010). Maya Light Types. [Online] Available [March 31st 2010]

Splicer, M. (2012). Lighting in Maya. [Online] Available [January 24th 2012]

Rendering 3: Light Effects
       [DVD]. (2004). Holywood,CA: Gnomon Workshop.