From BlenderWiki
Hemi
Mode: All modes
Panel: Lamp (Shading context, Lamp sub-context, F5)
Description
The Hemi lamp provides light from the direction of a 180° hemisphere, designed to simulate the light coming from a heavily clouded or otherwise uniform sky. In other words, it is a light which is shed, uniformly, by a glowing dome surrounding the scene (Hemi light conceptual scheme).
Similar to the Sun lamp, the Hemi’s location is unimportant, while its orientation is key.
The Hemi lamp is represented with four arcs, visualizing the orientation of the hemispherical dome, and a dashed line representing the direction in which the maximum energy is radiated, the inside of the hemisphere.
Options
- Common options
- The Dist, Energy and Color settings are common to most types of lamps, and are described here.
- However, note that as this lamp always uses a constant light falloff, the Dist setting doesn’t have any effect in practice!
Todo
Is it true that for Sun and Hemi lamps, Dist has no effect at all? -- Mont29 14:13, 2 May 2009 (UTC).
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- The Layer, Negative, No Diffuse and No Specular settings control what the lamp affect, as described in this page.
The Hemi lamp has no light falloff settings: it always uses a constant attenuation (i.e. no attenuation!).
“Shadow and Spot” Panel
When a Hemi light source is selected, the Shadow and Spot panel is completely empty: this lamp is the only one in Blender which cannot cast any shadow.
Examples
The results of a Hemi light for the nine spheres set are shown in (Render example). Notice how the spheres are lit more completely around and to the backside, and the beige ground appears to be bright. The softness of the Hemi light in comparison to the Sun light is evident.
You can find more useful and complete examples about lamps in the “lighting rigs” page.
Outdoor Light
To achieve outdoor lighting you can use both a Sun light, say an Energy of 1.0, with a warm yellow/orange tint and shadowing enabled, plus a weaker bluish Hemi light faking the light coming from every point of a clear blue sky.
(Outdoor light example) shows an example with relative parameters. The configuration is as:
- Sun light: Energy=1.0; RGB=(1.0,0.95,0.8); Sun direction in a polar reference is (135°,135°).
- Hemi light: Energy=0.5; RGB=(0.64,0.78,1.0); pointing down.
Technical Details
See Also
