2022-10-03 00:10:54 +00:00
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# Materials: Commands {#mat_commands}
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## skyparms
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2022-10-17 20:33:16 +00:00
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### Overview
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2022-10-03 00:10:54 +00:00
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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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2022-12-15 00:51:16 +00:00
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```
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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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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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```
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