Let there be light VRay Light IES Lesson

Let there be light: VRay. Light. IES

Lesson Introduction - Orientation • This presentation will take you through • Learning Outcomes: You creating an IES light in V-Ray for Maya will be able to light a scene • The information centers around the use of with a VRay. Light. IES and the VRay. Light. IES understand how to adjust the settings to create the • This lesson topic is approximately 20 look you want in your minutes in length renders • Presentation covers all 3 Learning Cycles for the Lesson Topic – Lecture, Demonstration, and Activity.

Lesson Topic: Vray. Light. IES • Objective – We will light a scene • Create & adjust the Vray. Light. IES with the Vray. Light and understand – Develop the look for our miniature house set, to create something that how to use IES light profiles in a has a cinematic feel scene • Outcome – You will be able to adjust the VRay IES Light to create different light looks in your renders

Lecture: Terminology • Lighting is important to our lives and our 3 D scenes. Without it we can’t see anything! – IES Profile • Illuminating Engineering Society’s standard file format for photometric data • Allows for V-Ray lights to look like specific lights used in real world architectural situations – Soft Shadows • shadow edges that are blurry and look more natural (depending on the light source) – Light Shape • The pattern type used to project the light

Lecture: Light! • Lighting in the real world – Controlling the direction of a light – Lighting is also about creating shadows; different lights can cast different patterns – Larger lights will have softer (more diffused) shadows

Lecture: Light! • Light Falloff – Real lights have Decay • Light falls off to the square of it’s distance – Inverse Square Law – An object at 2 x the distance away from a light will receive 1/4 x of the light it would at 1 x distance – An object at 3 x the distance away from a light will received 1/9 x of the light it would at 1 x the distance

Lecture: Light! • Light Temperature – Use the temperature value to create the right mood for your scene

Lesson Topic: IES Light • Light Overview – IES File Name – Intensity is the overall strength of a light – Color vs. Temperature • Which mode to use depends on what results you want – Soft Shadows • Edges on shadows be hard and sharp, or soft and blurry – Light Shape • Shape information taken from IES profile or user-defined

Lesson Topic: IES Light • Intensity, Color, Temperature – Mode: Color - the light’s color is directly specified by the Color value. When using photometric units, only the color’s hue value is used. – Mode: Temperature - specifies the light color temperature in degrees Kelvin • Great for matching real world lights – Intensity - defines the strength of the light Color Mode: Color (with indigo Light Color) Color Mode: Temperature (with Temp. of 3200)

Lesson Topic: IES Light • IES File – the measurement of distribution of light (intensity) stored in ASCII format – a digital profile of a real world light • Filter Color – A color multiplier for the light to tint it as you need

Lesson Topic: IES Light • Shadows – The light casts shadows in the scene – sometimes the. ies file contains information about the physical shape and size of the bulb. When this option is on the light will cast shadows according to this information. Otherwise the light will cast shadows as if it was a Point Light. • Soft Shadows No Shadows (hard) Shadows Soft Shadows

Lesson Topic: Lecture Conclusion • Profiles – Photometric data that can be used in 3 d scenes • Color Modes – Temperature vs. Color – Intensity (No Units) • Soft Shadows – Using available IES info to cast realistic shadows • Light Shape – Size adjustments

Lesson Topic: Time to see it work! • Demonstration Cycle! • Watch while I demonstrate how to create and adjust an IES Light in our miniature house scene

Lesson Topic: Time to do it yourself! • Activity Cycle! • Now it’s your turn!! • Use the provided scene file to recreate the cinematic look as you have seen me demonstrate

Here are the values I used: • Key light in desk lamp – – – • Example_IES_A IES File Temperature 4800 Filter color 0. 075 Intensity 0. 025 Light Shape From IES file Back light in Wall lamp – – – – Example_IES_B IES File Temperature 3200 Filter color 0. 16 Intensity 0. 3 Soft Shadows Circular Light Shape Diameter 3. 0