RedSDK Point Luminance

RedSDK Point Light Luminance

About Point Light

The point light is a centric light. It produces lighting in all directions around the point light, although the light is in all directions, it is like a cube with a wide square spot light on each side, there is a brighter spot emanating from the centre of each side with the light diminishing slightly as the sides merge.



In TC pro the luminance should be attached to an ACIS solid object, objects created as TC surface in pro can give unpredictable results when luminance is attached to them, with respect to the luminance origin.



  • Intensity decay – Set the rate at which the lights power diminishes.
See separate RedSDK intensity decay page.
  • Diffuse color – Sets the diffuse color of the light.
  • Diffuse affect – Sets the relative intensity (power) of the diffused light.
Diffuse colour and affect, do a similar job in black to white colour, the difference comes when one uses a non grey colour, the diffuse color slider midpoint is the selected colour, moving the slider toward left darkens the colour, moving towards right lightens the colour eventually reaching white, Diffues affect is a bit like a dimmer switch

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  • Specular color – Sets the specular color of the light.
  • Specular affect – Sets the relative intensity (power) of the Specular light.
Specular colour works on pen/brush colour objects when no materials are applied, Adjusting the affect to the right (100) shows a bright spot, moving to the left (0) eliminates the bright spot.

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  • Pos – Sets the X,Y,Z position of the light relative to the object to which it is attached.
Position Sets the origin point of the light with respect to the object it is attached to, this is especially important when shadows is selected (see below), the light position at 0,0,0 is the centre of extents of the object the luminance is attached to.

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  • Shadows – Sets whether the light will generate shadows, or not.
  • Shadow Color – Specifies the color of shadows created by the light.
With shadows switched on the light source position should be adjusted as necessary to allow the light to shine, in the images below the source sphere was 115 units radius (330 diameter), and the intensity increased to 5

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The shadow colour has two functions, to change the colour of the shadow and to lighten and darken the shadow,

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  • Shadow Map - Sets shadow map on or off.
There are no user controls with this shadow map, it appears fully automatic, Shadow maps cap speed up rendering by taking an image (map) from the lights perspective and re-rendering from the camera comparing each pixel to the map, however they can result in a slight loss of quality.

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Contributors to this page: AndyUK .
Page last modified on Sunday 05 of March, 2017 12:21:57 PST by AndyUK.