52 lines
2.1 KiB
Markdown
52 lines
2.1 KiB
Markdown
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# Materials: Commands {#mat_commands}
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## skyparms
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### Overview {#overview}
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**skyParms <farbox> <cloudheight> <nearbox>**
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Specifies how to use the surface as a sky, including an optional far box
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(stars, moon, etc), optional cloud layers with any shader attributes,
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and an optional near box (mountains in front of the clouds, etc). Some
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of the VMAP specific commands use this as a reference as to what skybox
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to use for color, intensity etc.
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The renderer will take it into account only if you do not supply any
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Stages in the material.
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**<farbox>** Specifies a set of files to use as an environment box
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behind all cloudlayers. Specify "-" for no farbox, or a file base name.
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A base name of "env/test" would look for files "env/test_rt.tga",
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"env/test_lf.tga", "env/test_ft.tga", "env/test_bk.tga",
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"env/test_up.tga", "env/test_dn.tga" to use as the right / left / front
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/ back / up / down sides.
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**<cloudheight>** controls apparent curvature of the cloud layers -
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lower numbers mean more curvature (and thus more distortion at the
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horizons). Higher height values create "flatter" skies with less horizon
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distortion. Think of height as the radius of a sphere on which the
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clouds are mapped. Good ranges are 64 to 256. The default value is 128.
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**<nearbox>** Specified as farbox, to be alpha blended ontop of the
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clouds. This has not be tested in a long time, so it probably doesn't
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actually work. Set to "-" to ignore.
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### Example Sky Material {#example_sky_material}
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` // Vera Visions Material`
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` {`
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` qer_editorImage textures/skies/dune.tga`
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` skyParms textures/skies/dune/bg 256 -`
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` noPicMip`
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` noMipmaps`
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` `
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` surfaceParm sky`
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` surfaceParm noimpact`
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` surfaceParm nolightmap`
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` surfaceParm nodlight`
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` {`
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` program skybox`
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` map $cube:textures/skies/dune/bg`
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` map textures/skies/clouds/dunecloud.tga`
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` map textures/skies/clouds/dunecloud_layer.tga`
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` }`
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` }`
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