From the course: 3ds Max 2019: Advanced Lighting

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Focusing an Arnold light beam with Lens Radius

Focusing an Arnold light beam with Lens Radius - 3ds Max Tutorial

From the course: 3ds Max 2019: Advanced Lighting

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Focusing an Arnold light beam with Lens Radius

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- [Instructor] As we saw in the previous movie the Arnold disc and quad lights have a parameter labeled spread that gives us the ability to focus light into a beam, however we can't control the cone angle and the light collimaiton separately. But the Arnold spotlight simulates light collimation through the lens radius parameter and we still have independent control over the cone angle. In fact with an Arnold spotlight we need both the lens radius and the cone angle to control the collimation effect. Let's do an ActiveShade render of this Arnold disc light and then switch its shape type over to spot, and here it is with just the default lens radius and cone angle. Let's start changing that up, Increase the lens radius a little bit, you can click and drag on that and see what happens. Once you get up into the realm beyond about .05 or so you can really start to see what's happening. As we increase that radius what's happening behind the scenes is that the position of the virtual light…

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