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This page exists within the Old ArtZone Wiki section of this site. Read the information presented on the linked page to better understand the significance of this fact.

Spotlights

Selecting Create > New Spotlight allows you to create a new Spotlight in your scene. A Spotlight is a directional light that covers an adjustable area in the shape of a cone, such as a flashlight.

Spotlights emit a cone of light in a certain direction. You can control the direction and width of the cone in degrees. As mentioned above, the difference between spot lights and point lights can be hard to see from certain angles. The main thing to remember is that spot lights only cast light in their specified cones. Objects outside those cones do not receive any direct illumination. The image shows an example of a spot light shining down onto the object from above and o the side.

lights_spotlightexample.jpg

Spotlight Parameters

In addition to the default parameters, each Spotlight has the following parameters to control the light cone which is the visible wireframe showing where the light's influence will be. The blue line in the cone is the Line of Sight showing the direct line to where the most light is concentrated.

Light

  • Spread Angle: Controls the width of the cone of light projected by the Spotlight in degrees. Spotlights spread a cone of light that widens with distance. This cone is aligned with the light’s rotation. This parameter specifies the cone’s total width. For example, if you specify 40 degrees, the light cone will project 20 degrees to all sides of the centerline for a total of 40 degrees.

    lights_spreadangle.jpg

Display / Scene View

  • Display Persistance: This toggle determines whether the light wireframes are visible even when the light is not selected. When placing objects in the scene, setting this toggle to On will make it easier to place objects where needed. Toggle to Off to set the camera wireframes to invisible when the camera is not selected.

    lights_displaypersis.jpg
  • Light Cone: These parameters set the options for the light cone wireframe.

    lights_spotlightcone.jpg
    • Ray Length: Determines the length of the ray wireframe. This is useful for finding where an object lies within the light's influence.

      lights_raylength.jpg
    • Opacity Scale: Adjusts the scale of the Ray Opacity allowing a greater variation in opacity. For example, if the ray opacity is set to 75%, then an opacity scale of 25% would be lighter than if the opacity scale was 75%.

      lights_opacityscale.jpg
    • Ray Opacity: In conjunction with the Opacity Scale, determines the opacity of the rays when viewing in OpenGL.

      lights_rayopacity.jpg
  • Light Base

    lights_spotlightbase.jpg
    • Show Base: Determines if the base of the light cone is visible or not.
    • Base Opacity: Sets the opacity of the base. Useful when placing objects within the influence of the light cone.

      lights_baseopacity.jpg
    • Show Edge: Determines if the edge around the base is visible or not.
    • Edge Opacity: Sets the opacity of the visible base edge.

      lights_baseedgeopacity.jpg