Learn how to add soft direct light.
- [Instructor] The last light in our triangle set up is the fill light, and that represents suffuse illumination coming from the imaginary open window behind the camera. Let's create our fill light. Go to the create panel, lights, Arnold, click Arnold Light, and click and drag in the top viewport to create the light at its target. Release the mouse, and then right-click to exit the tool. With the light still selected, let's go to the modify panel and rename it.
We'll call it fill light. Let's see what we have so far. Click on active shade to render the physical camera. Here's a little spot of light I've got on my version of the scene, because of the place I positioned the light. So let's sort that out. Go into the modify panel and set the light type to quad. And now that changes everything. We want to move and rotate it, so turn off targeted.
So that turn that off first. Let's set the target distance to three feet. And then grab the position tool, select and move, and position that kind of behind the spotlight. And move it up a bit in the front viewport so that it's at about the same level as the other window. And then we want to rotate it, and so that we rotate it just the way we want, I'll go to the rotate tool and choose Gimbal mode, and type in the values down here in the transform type in area.
X rotation negative 90. Y rotation of negative 180. And Z rotation of negative 90 again. And now that light is positioned and rotated just as I needed. I can deselect it, and get in a bit closer with the mouse wheel, and the light is pointing into the room as we want it to be. It's a little bit over exposed so let's select it and we can turn off the rotation gizmo by choosing the select object tool.
And then go down into the modify panel, and we've got the exposure, so that's found under intensity. Set the exposure down to nine. Let's make it a bit more blue to match the blue light coming through the other window. Set the Kelvin value to 7500 and press enter. And now we've got a nice blue light coming from our fill light. We can change up its size. Scroll up in the modify panel and set quad X and quad Y both to three feet and six inches.
So select that, type in three, single quote, six and double quote, press enter. And here in quad Y the same. Three, single quote, six, double quote, and enter. And now it's almost exactly the same as the other window. We want to check in on the parameters and make sure those are correct. The spread should be one. The roundness zero. And the soft edge is set to one. We can play around with that, maybe bring that down to zero as well.
The soft edge won't make a huge difference, but it will add a little bit more light and make it a little bit more even. That's how to set up a quad light to provide fill or suffuse illumination.
- Arnold rendering concepts
- Arnold lights such as quad, spot, and distant
- Modifying Arnold object properties
- Filtering light with the gobo filter modifier
- Image-based lighting with Skydome
- Daylight simulation with Physical Sky
- Arnold Standard Surface material parameters
- Diffuse, opacity, and bump mapping
- Rendering refractions with Transmission
- Building an Arnold shading network
- Test rendering with utility map
- Mesh subdivision and displacement at render time
- Atmospheric perspective with scene environment fog
- Rendering a spherical environment with VR Camera