Set the virtual camera's sensitivity.
- To change the brightness of a rendering of course we can adjust the intensity or exposure of the lights. We can also adjust the exposure on the camera, to let in more or less light. In the camera viewport on the viewport panel toolbar, there's a button labeled camera attributes. It's a camera with a little gear icon. Click on camera attributes and in the attribute editor, let's close the camera attributes and the film back sections and open up the Arnold section.
And here we've got the exposure value to control how much light gets into the camera. To see the results, let's open up the Arnold render view. I've got focus on camera one viewport. Go to Arnold render and with the default exposure of zero it looks a little bit dim. If this was the only light I was going to use in the shot then I would probably want to increase the exposure. Click and drag on that slider to open up the camera's virtual iris.
And each whole number here, let's in twice as much light. So if I set it to zero, I get a pretty dim rendering. With a value of one, it's twice as bright. And then with exposure of two, it's now four times as bright as it was with an exposure of zero. If we want to preview the lighting in the viewport, it's a little bit challenging with the focus on camera one viewport once again, I can press the seven key on the keyboard to display lighting in that view.
But it looks completely black. And that's because the exposure for the viewport doesn't match this exposure value here. On the viewport panel toolbar, once again, you've got an exposure value here. It's got an iris icon. And here's the exposure value. We can just type in a value of 15 here and press enter and now we have approximately the same exposure in the viewport here as we do in the Arnold render view. But because we don't have any indirect, or bounce light in the viewport, we have black areas in the rendering.
And if we want to be able to see what we're doing we probably need to switch back into just a simple shaded mode. I'll set the exposure back to zero and click in the viewport to give focus and press the six key to go back to shaded and textured. That's how to set the Arnold exposure value for a camera, and also adjust the exposure for an individual viewport.
- Arnold rendering concepts
- Lighting with Maya and Arnold lights
- Controlling exposure
- Filtering light with Gobo
- Light attenuation with Decay
- Image-based lighting with Skydome
- Exterior daylight with Physical Sky
- Arnold Standard Surface material attributes
- Mapping material attributes
- Rendering refractions
- Mesh subdivision and displacement at render time
- Shading effects such as ambient occlusion and vertex color
- Camera effects such as fisheye and depth of field
- Animation image sequence rendering