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3D clouds: Difference between revisions
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Added new example picture and fixed various spelling and grammar errors.
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[[FlightGear]]s [[weather]] system uses '''3D clouds''' for a realistic reproduction of the sky. 3D clouds have been present since version 0.9.1, and significantly updated in version 0.9.9. | [[FlightGear]]s [[weather]] system uses '''3D clouds''' for a realistic reproduction of the sky. 3D clouds have been present since version 0.9.1, and significantly updated in version 0.9.9. | ||
When FlightGear switched from [[PLIB]] to [[OSG]] the 3D clouds were temporarily lost. | When FlightGear switched from [[PLIB]] to [[OSG]] the 3D clouds were temporarily lost. As of October 2008 the clouds were back in [[FlightGear CVS]] and released with [[FlightGear 1.9.0]] that December. Current development versions feature an improved 3D cloud rendering system that will be included in the next release. | ||
==Cloud shapes and layers== | ==Cloud shapes and layers== | ||
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A 3D cloud layer is defined in the <layers> section. It contains of a number of randomly located <boxes>, containing a set of <clouds>. | A 3D cloud layer is defined in the <layers> section. It contains of a number of randomly located <boxes>, containing a set of <clouds>. | ||
Each cloud is | Each cloud is generated with random size, based on the following tags: | ||
<min-cloud-width-m> | <min-cloud-width-m> | ||
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The <texture> defines the texture file to be used for the sprite. The texture file may contain more than one texture in a grid, by setting the <num-textures-x> and <num-textures-y> tags. | The <texture> defines the texture file to be used for the sprite. The texture file may contain more than one texture in a grid, by setting the <num-textures-x> and <num-textures-y> tags. | ||
Clouds are darker towards the bottom. bottom-shade indicates the shading factor of the bottom of the cloud compared with the top. | |||
Finally, note that the clouds are defined as a set of properties, so can be modified within the simulator under /environment/cloud-layers. You can then see the effects of your changes by changing the clouds dialog, which reloads the clouds from properties. | Finally, note that the clouds are defined as a set of properties, so they can be modified within the simulator under /environment/cloud-layers. You can then see the effects of your changes by changing the clouds dialog, which reloads the clouds from properties. | ||
==Cloud Textures== | ==Cloud Textures== | ||