Lights (The Chickadee Game Toolkit)

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5.3.9 Lights

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The (chickadee graphics light) module provides a data type for -dynamic lights that can be used to light 3D objects (such as -Models or Meshes.) -

There are 3 types of dynamic lights: -

point light: -Emits light in all directions from a specific point in space, like a -light bulb. -
directional light: -Emits light of a constant intensity in a direction, like sunlight. -
spot light: -Emits a cone of light in a direction, like a flashlight. -

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Procedure: make-point-light [#:position (vec3 0 0 0)] [#:color black] [#:intensity 1]: -
Return a new point light located at position that emits -color light. -

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Procedure: make-directional-light [#:direction (vec3 0 -1 0)] [#:color black] [#:intensity 1]: -
Return a new directional light that emits color light in -direction. -

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Procedure: make-spot-light [#:position (vec3 0 0 0)] [#:direction (vec3 0 -1 0)] [#:color black] [#:cut-off π/4] [#:intensity 1]: -
Return a new spot light located at position that emits -color light in direction in a cone that cuts off at -cut-off radians. -

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Procedure: point-light? obj: Return #t if obj is a point light. -

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Procedure: directional-light? obj: Return #t if obj is a directional light. -

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Procedure: spot-light? obj: Return #t if obj is a spot light. -

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Procedure: light-type light

Return the type of light, one of: -

point -
directional -
spot -

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Procedure: light-color light: Return the color of light. -

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Procedure: light-intensity light: Return the intensity of light. -

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Procedure: light-position light: Return the position of light. The value is irrelevant for -directional lights. -

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Procedure: light-direction light: Return the direction of light. The value is irrelevant for -point lights. -

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Procedure: light-cut-off light: Return the cosine of the cut off angle of light. The value is -only relevant for spot lights. -

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Procedure: set-light-color! light color: Set the color of light to color. -

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Procedure: set-light-position! light position: Set the position of light to position. -

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Procedure: set-light-direction! light direction: Set the direction of light to direction. -

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Procedure: set-light-cut-off! light cut-off: Set the cut off angle of light to cut-off. -

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