DEPRECATED. This shader is unsupported, but it may still get installed with Softimage to provide compatibility with older scenes that
use it. It is recommended that you replace unsupported shaders in your scenes with equivalent shaders from the current Softimage
shader library.
| Sky | Ground
Environment (Legacy)
Output: Color (RGB) value
Creates an environment that consists of an infinitely stretching texture-mapped sky with a similar infinitely stretching texture-mapped
ground parallel to it.
You can make convincing outdoor effects using this shader. You can change the sky and the ground colors, as well as place
and blend the texture map in a variety of ways.
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The shader's name. Enter any name you like, or leave the default.
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Sky
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Uses the intensity of the color in the texture file to determine the blend.
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Uses the alpha channel of the texture file to determine the blend.
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No blending. The texture dominates.
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The base color of the sky directly overhead
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The color of the sky at the horizon
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The angle, in degrees, below which the sky isn't mapped. The angle is measured positively from the horizon toward the zenith,
in degrees. This parameter may be used to reduce any aliasing that might arise on the horizon.
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The bias between Horizon and Zenith color. A value > 0.5 results in the sky color being more inclined to the Zenith color
than the Horizon color, and vice versa.
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The amount of diffusion of the sky colors into the texture-mapped zone of the ceiling. This parameter in conjunction with
the limit value can be used to simulate atmospheric haze.
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Transformations
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Width and Depth determine the scaling of the sky in the X and Z directions, respectively. High values stretch the sky while
lower ones make it repeat more often.
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Rotates the X and Y direction of the sky component.
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Here Width and Depth control the offset of the sky in the X and Z directions, respectively.
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Ground
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Makes the ground a mirror image of the ceiling.
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Uses the intensity of the color in the texture file to determine the blend.
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Uses the alpha channel of the texture file to determine the blend.
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No blending. The texture dominates.
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Causes the texture to make some additional calculations for the ground to allow it to be at a finite distance. In fact, the
ground is placed at the Y position 0. This allows objects to change appearance as they move along the ground. Also, the effect
of Ground Limit and Ground Diffuse change, and only the Ground Horizon color is used as a background color to the texture;
otherwise, both the sky and the ground are infinitely far away in all directions so that translations have no effect.
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Defines the color of the ground center, directly below you or the camera.
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Defines the color of the ground nearest to the horizon.
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The bias between the Base Color and the Horizon Color.
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There is no texture displayed in the angular sector that this value defines. The angle is measured positive from the horizon
towards the base, in degrees. When "Real Ground" is selected, however, this limit is not in degrees but in units of "distance."
This is a product of the distance to the point on the texture and how obliquely the ray strikes the texture. So, if the texture
is either far away, or viewed at an oblique angle, or both, it is "distant." In this case, try values of 500-1000 to start
with.
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Increasing this value blends the area outside the Ground Limit into the ground texture, producing a smooth transition between
them. Essentially, the base ground color is allowed to exponentially diffuse into the texture. This gives the texture a hazy
appearance as it approaches the horizon. When "Real Ground" is on, the effect is slightly different. Then this value specifies
the number of units of "distance" over which the Ground Horizon color blends into the ground texture.
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Transformations
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Width and Depth determine the scaling of the Ground Texture in the X and Z directions, respectively. High values stretch the
texture while lower ones make the texture repeat more often.
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Rotates the X and Y direction.
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Here Width and Depth control the offset in the Ground Texture in the X and Z directions, respectively.
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