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Table of Contents
Start Page » Game Development with the Drag[en]gine » Skin Texture Properties » Texture Property Database » absorption.range
Summary
| Texture Property Name | absorption.range |
| Description | Defines the sub surface absorption range. |
| Excepted Data Source | 1 component value |
| Data Range | 0 or grater |
| Default Value | 0 |
| Affected Modules | Graphic |
| Linked Properties | absorption |
Description
The absorption.range texture property defines the range of scattering in sub surface absorption of a material. Sub surface absorption affects light entering the material after surface based texture properties have taken effect. Sub surface absorption has two main effects. The first is that light is scattered under the surface and exits at a nearby point. The second effect is translucency. In both cases the absorption.range texture property defines the range of absorption. Beyond this limit the light is fully absorbed by the material. In between the light is partially absorbed using an exponential decay function. In contrast to the absorption texture property the absorption.range is a single component value and defines the largest radius. The actual absorption used is thus absorption times absorption.range component wise. See absorption texture property more information about absorption.
The source is a value with 1 color component with values 0 or greater.
The default value for this texture property is 0 which disables sub surface light absorption and scattering.
A value of 0.02 is a typical choice for human skin.
Examples
Stanford dragon model with 0 absorption and back-lit. This could be metal or polished plastic.
Stanford dragon model with 0.05 absorption range and back-lit. The added sub surface light absorption gives a glassy look.
Stanford armadillo model with human skin and 0 absorption. The skin looks like plastic due to the missing sub surface light scattering. The main reason are the hard shadows.
Stanford armadillo with human skin, 0.02 absorption range and (1,1/3,1/6) absorption. The shadows receive now the skin typical brightening up especially in the redish colro specturm.
