Creating a visible Spotlight

Tutorials/guides/tips on how to use Indigo and the Indigo exporters
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Creating a visible Spotlight

Post by edwardtremethick » Tue Jul 10, 2018 5:05 pm


I am wondering how to create a spotlight in Sketchup, that is then a visible light in Skindigo when rendered. I have emailed the Indigo Team, and they have sent me the following information and also referred me to ask here.

"You need to have a participating medium (e.g. SSS medium) for the light to scatter in." - How do I do this/what does it mean? Is it done in Sketchup, or in Skindigo?


"You also need to form the light into beams in the first place. You can do this by modelling a parabolic reflector with a shiny metal."
How can I model this parabolic reflector?

Thanks. Edward.

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Re: Creating a visible Spotlight

Post by yonosoy » Mon Jul 16, 2018 6:02 am

Hi Edward.

First, use a geometry (a simple box could be perfect) for the SSS component. The box must take up your scene. Apply a specular material with IOR=1 and an amount of SSS. This is a simple example of the material. You have almost one example more in the database. The concept is that there must be some dust in the ambient (or vapour...).
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Then you need to modell a reflector. A parabolic one is the best. Here you have some clues of how to do it in Sketchup. If you have problems to do this, try with a cilinder with a tap opened and oriented as your desire. Give to this geometry a shiny metal material to reflect.

Once this is done you need a third geometry for the light (a little sphere could be right). Try a simple polygon with an IES profile (this is more like a trick). Give to this geometry a desired emitting material. In this video is explained the parabolic concept, so you can place the light correctly in the parabolic reflector.

In this way you will be able to see the volume light as you desire.
If you have some kind of problem I will try to help you more and give you a modelled example (maybe in a days).

Good luck, hope this clarify something.
"... the hamster don't see the wheel, and this wasn't said before." (yoS eidaN "el Olvidao")
"... nor 0.2 galaxys, nor 0.8 little chikens ..."

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