How do Projected Reflections work?

How do Projected Reflections work?

Article Details

Poster: Morten
Article ID: 441
Posted: Thu 28 Jan 2016
Approved: Yes

How do Projected Reflections work?

There are three different reflection types in Lumion:
  • Planar reflections: Very accurate on planar surfaces but renders slowly.
  • SpeedRay Reflections (Pro only): Mostly accurate on any surface and renders fast.
  • Projected Reflections: Not very accurate on any surface but renders very fast.
Projected Reflections are the default reflection type in Lumion. They are assigned to reflective surfaces that are not affected by Planar Reflections and SpeedRay reflections. The projected reflection method is only an approximation and will never provide as realistic reflections as the Planar Reflections or SpeedRay Reflections but they're very fast to render.

Projected reflections in Lumion rely on a single 360 degree panoramic reflection texture which is projected onto any reflective materials, including the ocean, that are not using Planar Reflections or SpeedRay Reflections.

In Build mode, the Reflection Control object is placed 100m above the Lumion terrain in order to provide generic reflections of the sky and entire scene.

However, when you render still images in Photo mode or still images via the 'Current Shot' tab in Movie mode, the 360 degree panoramic reflection texture is automatically rendered at the camera position.

When you render MP4 videos or image sequences via the 'Image sequence' tab in Movie mode, the 360 degree panoramic reflection texture is rendered at the position of the camera at the first frame of each clip. The position that the 360 degree panoramic reflection texture is being rendered at does not change while the clip is being rendered.

To preview the reflections before starting the rendering procedure, you can press the U-key to update the 'Projected Reflections' so that they're rendered at the current camera position.

To disable these automated functions, you can insert the Reflection Control object into your scene in Build mode, and move it around manually in Movie mode via the Move or Advanced Move effects.

Add the Lights and Special Objects -> Utilities -> Reflection Control object to your scene to specify the position where the 360 degree panoramic reflection texture should be rendered at. Bear in mind that you can also animate this object with the Move/Advanced Move effects in the Movie section.

 [dot] Move the Reflection Control high up in the sky (say 500m) to get reflections only of the clouds and sky bright areas.  This can work to avoid some pixelated looking reflections.
 [dot] If you have added a Reflection Control for a movie, you will need to set the position for each clip.  However, it is not always required that you move the Reflection Control along with the camera.  That is, sometimes it is enough to simply set a single position for each clip.
 [dot] Interior views require the Reflection Control be within the interior area (room).  Generally position it high up away from other objects, so that you get brighter general reflections and not specific objects included in the reflection.

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