Canvas 3D - Light Tag

Light Tag Reference

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Introduction

The sounrce of light in a 3D world can be one of many types. These types are limited to Ambient (a light source from all directions) and Diffuse (Light cast from one point in a direction).

Tag Attributes

• number
  • Usage: <light number="3" />.
  • OpenGL handles many different lights at the same time and therefore requires an identifier to access them.
  • This number is restricted from 1 to 10.
• type
  • Usage: <light type="diffuse" />.
  • This attributes specifies the type of light that will be created and the way it can be used.
  • The attribute only accepts the values of 'ambient' and 'diffuse'.
• color
  • Usage: <light color="#FF00FF" />.
  • This determines the color of the light that is eing cast on the object. This values should be in Hex format.
• position
  • Usage: <light position="0.3, 0.6, 2.1" />.
  • The position attribute specifies the 3D location of the light source.
  • Three values must be specified as a 3D vector separated by commas.
• orientation
  • Usage: <light orientation="4.1, 6.3, -2.8" />.
  • The orientation defines the direction the light source is pointing at.
  • This attribute only applies to Diffuse Lighting and is ignored if used in another case.
  • The default is {0.0, 0.0, 1.0} if ommited.

Syntax

<canvas>
  <light number="1" position="0.0, 0.3, 0.5" orientation="0.2, 0.6, 1.3" color="#0000FF" type="diffuse" />
  <light number="2" position="5.0, 3.3, 0.1" color="#FF00FF" type="ambient" />
</canvas>

References

• OpenGL Lighting Example