POV-Ray : Documentation : 2.4.9.7 No_Image, No_Reflection
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2.4.9.6 No_Shadow   2.4.9.8 Double_Illuminate

2.4.9.7 No_Image, No_Reflection

Syntax:

  OBJECT {
    [OBJECT_ITEMS...]
    no_image
    no_reflection
  }

These two keywords are very similar in usage and function to the no_shadow keyword, and control an object's visibility.
You can use any combination of the three with your object.

When no_image is used, the object will not be seen by the camera, either directly or through transparent/refractive objects. However, it will still cast shadows, and show up in reflections (unless no_reflection and/or no_shadow is used also).

When no_reflection is used, the object will not show up in reflections. It will be seen by the camera (and through transparent/refractive objects) and cast shadows, unless no_image and/or no_shadow is used.

Using these three keywords you can produce interesting effects like a sphere casting a rectangular shadow, a cube that shows up as a cone in mirrors, etc.

2.4.9.6 No_Shadow   2.4.9.8 Double_Illuminate


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