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The sky is drawn in a sphere which can be defined on the main interface. - Show In Viewport: enables / disables displaying sky preview in the viewport.
- Radius: radius of the virtual sky sphere.
- Segments: number of segments of the virtual sky sphere, specifies the detailed look of the preview.
There are four environment lighting options: - None: no environment lighting will be used. All the lighting in the scene will be provided by emitter materials (described later).
- Sky Dome: creates a consistent color or gradient dome for the scene.
- Physical Sky: a sophisticated atmosphere model that reproduces the skylight conditions after physical parameters. The atmosphere parameters allow users to customize the look of the sky and the resulting light in the scene.
- Imaged Based Lighting (IBL): allows users to light the scene by applying an HDR image to a virtual sphere that encompasses the scene.
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Sky Dome
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The colored Sky Dome can be specified via the following parameters: - Intensity (cd/m2): specifies the intensity of the Sky Dome in Candela per square meter which means how much light is emitted.
- Zenith: specifies the color of the dome at the zenith (the highest point above our head).
- Horizon: specifies the color of the dome at the horizon.
- Mid Point (degrees): specifies the transition between the Zenith and Horizon colors. This value indicates the angle at which the contribution of the colors is equal, where 0° and 90° correspond to Horizon and Zenith respectively. For a consistent color dome, the same color for both Zenith and Horizon has to be choosen.
- Sun: enables / disables rendering the Sky Dome together with the sun from the current Physical Sky settings.
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Physical Sky
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Maxwell Render provides a realistic simulation of the sky via the Physical Sky lighting option. Pre-sets of the sky settings can be loaded from and saved to a file (.sky) to share with other users. - Load Sky Preset: specifies the path of the preset file to load.
- Save Sky Preset: saves the sky settings to the preset file.
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Atmosphere specific parameters are defined on the Atmosphere tab. - Intensity: controls the light intensity of the sky.
- Planet Reflectance: specifies the percentage of light reflected from the planet surface back into the atmosphere. Read more...
Gas Properties: - Ozone (cm): specifies the amount of ozone gas in the atmosphere. Read more...
- Water (cm): specifies the amount of water vapor in the atmosphere. Read more...
The physical sky model in Maxwell Render adds parameters for aerosols: small particles found in the atmosphere. Light interacts with these particles as it travels through the atmosphere. They absorb and scatter light, which has a big impact on the coloration of the sky and scene illumination. - Turbidity Coefficient: specifies the concentration and amount of particles in the atmosphere. Read more...
- Wavelength Exponent: specifies the average size of the particles in the atmosphere. Read more...
- Reflectance: controls the rate of energy scattered and absorbed by the aerosols. Read more...
- Asymmetry: specifies the anisotropy of the particles. Anisotropy controls the scattering direction of the light. Read more...
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Image Based Lighting
Image Based Lighting (IBL) allows users to apply high dynamic range data to a virtual sphere to light the scene, providing accurate environment lighting. The scene will be lit according to the properties of the HDR image and reflections from this environment will also be shown on the models. HDR, MXI or EXR image formats are accepted. The images should be in the Latitude/ Longitude format (the width should be twice the height), images in “strobes” or “cross” formats will not work correctly.
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