Join Brian Bradley for an in-depth discussion in this video A primer on exposure values (EVs), part of V-Ray 3.0 for 3ds Max Essential Training.
- Now, whilst many V-Ray users are no strangers to using real world camera parameters such as f-number, shutter speed and film speed to control exposure in a render, what some of us may not be quite so au fait with are the exposure values, or EVs for short, that the new physical camera uses by default. Well, an exposure value is really just a quick and easy way in which we can describe the amount of light that is present in a given environment. Once measured and then exposure value established, that number can be used to dial in our exposure settings, and so give us a theoretically best exposure for the shot that we are wanting to take.
Interestingly, though, an exposure value doesn't actually give us an exact recipe or specific set of exposure parameters that need to be used in order to achieve it. In fact, any specific exposure value can be arrived at by means of a variety of shutter speed, aperture, and ISO or film speed combinations. Although, for the information purists among us, I do need to note here that, strictly speaking, a calculation that takes ISO or film sensitivity into account along with shutter speed and aperture should actually be referred to as a light and not exposure value, given that an exposure value, technically speaking, only refers to a variety of combinations that use just shutter speed and aperture.
That technicality noted, then, let's take a look at a for instance. A clear, bright, sunny day might generate an exposure value of around about 15 or so. Now, a real world camera could achieve this desired exposure value by dialing its shutter speed to 1/500th of a second and setting it's aperture to F-8. The exact same exposure value, though, could also be achieved by setting the shutter speed at 1/60th of a second, and the aperture to F-22, or even 1/400th of a second at F-2.8.
Hopefully you get the point. Same EV through multiple combinations. Now, whilst the end exposure from each of these different settings would look identical, the shots themselves would look very, very different indeed as the various combinations of aperture and shutter speed would massively affect both depth of field and motion blurring in the shot. Now, thankfully for us, whilst all of the above information is both useful and relevant, we aren't, when rendering with the physical camera in 3ds Max, actually bound by the same technical limitations that are present on real world cameras, something we will hopefully be able to demonstrate over the next few videos in this chapter.
- Using the new UI elements, Quick Settings, and revamped Frame Buffer
- Understanding color mapping modes
- Adding V-Ray light types
- Working with the V-Ray Sun and Sky systems and dome light
- Using irradiance mapping and light cache
- Working with diffuse color maps
- Making reflective materials
- Creating a translucency effect
- Using the new SSS and skin shaders
- Ensuring quality with image sampling
- Working with the adaptive subdivision engine
- Controlling the physical camera
- Working with FX tools such as VRayFur and VRayMetaball
- Stereoscopic 3D rendering
- Using Render Mask
Skill Level Intermediate
Q: This course was updated on 02/02/2016. What changed?
A: We added tutorials on the new 3ds Max camera tool, which replaces the defunct V-Ray Physical Camera. The author also includes a method for creating a V-Ray camera via scripting.
Q: This course was updated on 04/19/2018. What changed?
A: New videos were added that cover V-Ray 3.1 to 3.3 updates.
SketchUp: Rendering with V-Ray 3with Brian Bradley4h 15m Intermediate
V-Ray: Control Color Bleed in SketchUpwith Brian Bradley1h 2m Intermediate
Introduction and Important Information
V-Ray 3.1 to 3.3 Updates
V-Ray 3.4 to 3.6 Updates
1. Getting Ready to Render with V-Ray
2. Key Lighting Tools
3. Global Illumination
4. V-Ray Materials and Maps
5. Quality Control with Image Sampling
6. Working with Cameras: The V-Ray Physical Camera
7. Working with Cameras: V-Ray 3 & the 3ds Max Physical Camera
8. The V-Ray FX Tools
What's next?1m 47s
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