Screen Space Ambient Obscurance
This image effect approximates Ambient Occlusion in realtime, as an image post-processing effect. It darkens creases, holes and surfaces that are close to each other. In real life, such areas tend to block out or occlude ambient light, hence they appear darker. It is an improvement to the existing Screen Space Ambient Occlusion effect in terms of quality and – depending on settings and hardware – speed. Additionally, it doesn’t rely on a generated normals buffer as it is recreating them on the fly based on depth.
As with the other image effects, you must have the Standard Assets Effects package installed before it becomes available.
The following two screenshots compare the results of a simple scene employing this occlusion effect.
The degree of darkening (in short: AO) is mostly controlled through the Intensity and Radius parameters. However, there is a post blur step performed to soften out the raw and noisy AO results. The following screenshot shows a result that performs a smaller blur.
Propiedades
| Propiedad: | Función: |
|---|---|
| Intensity | El grado de oscuridad producido por el efecto. |
| Radius | El área máxima tomada en cuenta cuando revise por una oclusión posible. |
| Blur Iterations | The blur passes to soften out the naturally noisy result. |
| Blur Filter Distance | The sample distance used during the blur passes. |
| Downsampling | The resolution at which calculations should be performed. Downsampling increases rendering speed at the cost of quality. |
Soporte hardware
Este efecto requiere una tarjeta gráfica que soporta Shader Model 3 y depth textures. Vea la página Capacidades Gráficas de Hardware y Emulación para más detalles y una lista de hardware complementario.