OmAreaLight

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The omAreaLight is a light shader for DAZ Studio allowing you to simulate panel lights, soft boxes, other rectangular light sources such as TVs, florescent lights, etc. The Area Light source provides for realistic soft shadows as well as diffuse wrapped lighting.

Contents

User Guide

Bellow is a description of the various controls of the omAreaLight.

Shadows

The look of your shadows will depend greatly on the size/shape of your light source (see the Area section). In addition to Shadow softness, omAreaLight also allows you to control shadow intensity (opacity) and color.

OmAreaLight parms shadows.jpg

Image Parameters
OmAreaLight 20x20 shad0-0-1 shadIntensity50.jpg Shadow Color=Blue
Shadow Intensity=50%

Light Basics

OmAreaLight parms light basic.jpg

The Double Sided parameter can be used to make the omAreaLight cast light in all directions, similar to an omnidirectional or point light.

Image Parameters
OmAreaLight 20x20double.jpg Double Sided=On

Area

The size/shape of the omAreaLight is a critical part of getting the look you want. A larger light source will provide softer light and shadow whereas a small light will give you sharper shadows and more direct lighting.

Using the Area Size X and Area Size Y Parameters, one can also create rectangle shapes to achieve effects as diverse as tube and panel lights.

OmAreaLight parms light area.jpg

Image Parameters
OmAreaLight 20x20.jpg Area Size X=20
Area Size Y=20
OmAreaLight 5x5.jpg Area Size X=5
Area Size Y=5
OmAreaLight 3x100.jpg Area Size X=3
Area Size Y=100
OmAreaLight 100x3.jpg Area Size X=100
Area Size Y=3

Area Samples

The Area Samples parameter is the speed vs quality control for the omAreaLight; the higher the value, the better quality shadows and shading you will get at the cost of render speed.

Alert.png When using large light sources (high Area Size values), you may need to increase your Area Samples in order to avoid noise artifacts.

Falloff

The Falloff controls for omAreaLight operate the same way as will the UberPoint light.

OmAreaLight parms light falloff.jpg

Image Parameters
OmAreaLight 20x20 falloff0-500-1.jpg Falloff Start=0
Fallof End=500
Falloff Decay=1
OmAreaLight 20x20 falloff0-500-2.jpg Falloff Start=0
Fallof End=500
Falloff Decay=2

The Light Source

When you load omAreaLight into a Scene you will see that the light has a child object called omAreaLight Source 1. This is geometry that represents the visible/renderable light source of the area light. If you do not want to see the light source plane in the render, select omAreaLight Source 1 and hide it (Toggle Visible to off).

OmAreaLight ui geo.jpg

Render Times

The omAreaLight calculates multiple samples (Area Samples) on the planar surface of the light in order to simulate the Area Light source. This means, the more samples, the longer the render times (and higher quality). Since the shadows are ray traced, scenes that using lots of transparency (ie trans-mapped hairstyles) or containing lots of geometry can result in very long render times.

The product page images I rendered were rendered at 650x500 on a Pentium Core Duo (2.2Ghz) Laptop with 3Gb RAM. Images rendered in the 5min-40min range.

Caveats

  • The area light provides accurate diffuse and shadows; as the lighting becomes more diffuse, the specular will also become softer. It may be difficult to create a perfectly sharp, square shaped highlight.
  • omAreaLight uses ray tracing in order to calculate its realistic shadows; this can lead to long render times especially when using large amounts of geometry and transparency.


Tips and Tricks

  • Do test renders with a low Area Samples value like 4 in order to block in light placement and size; bump up to a value like 16 for final renders.
  • When using large light sources (high Area Size values), you may need to increase your Area Samples in order to avoid noise artifacts.
  • As you increase the size of the area light, you may need to also increase the intensity.
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