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VRay.com - Your source for all things VRay  ::  VRay for SketchUp  ::  Manual  ::  The Characteristics of Rectangular Light

VRay for SketchUp Manual

VRay for SketchUp Manual

The Characteristics of Rectangular Light

Rectangular Light plays a very important role in V-Ray. Despite its ease of use, it also gets a smoother final result. Unlike the Point Light, Rectangular Light doesn't have the worry about the angle of the light. It also allows reflective material to bounce the light around the scene. Other type of lights will not be seen in a reflective object. Below are some important characteristics about Rectangular Light.

Size does matter

See images below and you will find the size of the Rectangular Light has an affect its intensity.

The Characteristics of Rectangular Light

The Characteristics of Rectangular Light

Shadow changes according to the size

Larger Rectangular Light spreads out to a larger area, so the shadow is not as clear as you will get from a smaller Rectangular Light.

Compare images below and you will see the differences between two different light sizes. The one on the top is rendered with a smaller light.

If you want to have a stronger shadow, we do not recommend you set the intensity way high and make the light size really small. It's better to use a different light type in V-Ray. Please see dialogue box of how to create a Point Light later.

Shadow changes according to the size

Shadow changes according to the size

Impacts on reflective objects due to Visible and Invisible Rectangular Light

There is an Invisible option in Rectangular Light. It allows the light visible or invisible from the render image. See images below. The one on the top has the Invisible option unchecked so the light appeared in the image. When apply a reflective material to the object, the light will also be reflected on the object. The image on the bottom has the Invisible option checked. Thus, you don't see the light in the image or on the object with reflective material applied to it.

The default setting for Rectangular Light has the Invisible option unchecked. If you see any unusual dark shadow in your rendered image, please check if your camera is blocked by the Rectangular Light in the scene.

Impacts on reflective objects due to Visible and Invisible Rectangular Light

Impacts on reflective objects due to Visible and Invisible Rectangular Light

Double Sided Option

You can tell the direction of the light from the SketchUp face orientation of the Rectangular Light. Reverse the face and you can change the direction of the light.

Rectangular Light Double Sided Option

The Double Sided option can turn the light direction from one side to both sides of the light. Just like to create two lights with opposite directions. Move the light away from the floor or wall to avoid any black out area.

The Double Sided option is usually used when the render is a big interior scene. It helps to light up the space without using too many lights. Normally we don't use it when render a product scene. There will be more discussion about lighting and environment lighting later on.

The default has the Double Sided option unchecked. Of course, if you check the Invisible option, you will not see the light in the three images below.

1. Light direction towards the left side.

Rectangular Light Double Sided Option - Example 1

2. Light direction towards the right side.

Rectangular Light Double Sided Option - Example 2

3. Double sided option checked

Rectangular Light Double Sided Option - Example 3

Pay attention to the size, location and intensity factors of Rectangular Light because they will affect the brightness and shadow clarity of your final result.

If the light is placed to far away and the subject is not bright enough, you can either increase the intensity or size of the light. On the other hand, you can lower the intensity or reduce the size of the light if you place the light too close or too bright. You will need to keep adjusting the size, location and the intensity of the rectangular light in order to get good lighting result.

Light Units

Intensity light unit allow you to select different physical units of the light. Using the correct intensity unit will help you to get the correct result when you are using the Physical Camera.

This takes into consideration the units scale of the scene.

Values:

Scalar - means the final color of the light it is given by the color and multiplier of the light without any conversion.

Rectangular Light - Values - Scalar

Lumens - the total power of the visible light is measured in lumens. The light's intensity does not depend on its size.

Rectangular Light - Values - Lumens

lm/m/m/sr - the light power calculated in lumens per square meter per steradias. The light's intensity depends on its size.

Rectangular Light - Values - lm/m/m/sr

Watts - the light power calculated in watts. The light's intensity does not depend on it's size. Does not work like a real light bulb. (Ex. real 100W light bulb emits between 2 and 3 watts as visible light.

Rectangular Light - Values - Watts

w/m/m/sr - the total visible light power calculated in watts per square meter per steradian. The light's intensity depends on its size.

Rectangular Light - Values - w/m/m/sr



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