direct illumination


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di·rect il·lu·mi·na·tion

an illumination in which the rays of light are directed downward, almost perpendicularly onto the upper surface of the object, which reflects the rays upward into the optical system.

direct illumination

direct illumination

The illumination of an object under a microscope by directing light rays upon its upper surface.
See also: illumination
References in periodicals archive ?
In the absence of direct illumination, this dark, shiny, textured monochrome reflects the gallery space, including the other works, and the viewer.
In this paper, we will use the first-order approximation, which we will call "direct primary illumination" since it considers only direct illumination from the sky.
In Finland, Juha Leiviska has created equally moving spaces in his churches, particularly at Myyrmaki (AR June 1987) where he manipulates planes of light and colour, fabric and concrete, subtle reflection and direct illumination to create a place as powerful as the one at Sogn Benedetg.
Global illumination methods (4) compute the contribution to the radiance at a point coming from direct illumination (i.
Two new, self-contained semiconductor laser systems are well suited for industrial applications in plastic welding, laser soldering, laser welding, heat treating and direct illumination.

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