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"Directional" light and ImageScaled coordinates (a bug?)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg129352] "Directional" light and ImageScaled coordinates (a bug?)
  • From: Alexey Popkov <lehin.p at gmail.com>
  • Date: Mon, 7 Jan 2013 00:38:14 -0500 (EST)
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  • Delivered-to: l-mathgroup@wolfram.com
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It seems that "Directional" light specification with the direction of the
light specified by a vector defined by two points
{"Directional", col, {pt1, pt2}}
ignores the second point 'pt2' when ImageScaled coordinates are used.
Compare:

Graphics3D[{White, Sphere[]},
 Lighting -> {{"Directional", Green, ImageScaled[{0, 0, 1}]}}]
Graphics3D[{White, Sphere[]},
 Lighting -> {{"Directional",
    Green, {ImageScaled[{0, 0, 1}], ImageScaled[{0, 0, 0}]}}}]
Graphics3D[{White, Sphere[]},
 Lighting -> {{"Directional",
    Green, {ImageScaled[{0, 0, 1}], ImageScaled[{1, 0, 1}]}}}]

I see no difference between the outputs from above in the version 9.0.0. Is
it a bug?

Sincerely,
Alexey Popkov




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