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- The 'phong' keyword controls the amount of Phong highlighting on the
- object. It causes bright shiny spots on the object that are the color of
- the light source being reflected.
-
- The Phong method measures the average of the facets facing in the mirror
- direction from the light sources to the viewer.
-
- Phong's value is typically from 0.0 to 1.0, where 1.0 causes complete
- saturation to the light source's color at the brightest area (center) of the
- highlight. The default phong 0.0 gives no highlight.
-
- The size of the highlight spot is defined by the phong_size value. The
- larger the phong_size, the tighter or smaller, the highlight and the shinier
- the appearance. The smaller the phong_size, the looser, or larger, the
- highlight and the less glossy the appearance.
-
- Typical values range from 1.0 (Very Dull) to 250 (Highly Polished) though
- any values may be used. Default phong_size is 40 (plastic) if phong_size is
- not specified. For example:
- finish {
- phong 0.9
- phong_size 60
- }
-
- If 'phong' is not specified then 'phong_size' has no effect.
-