This week’s class was about CG. We saw different channels. For now, we get to use RGB which is red green and blue but when you render in 3d software we can add more passes. This help to get better control over the highlights, mid-tones and shadows. A rule of thumb is whenever you’re following to rebuild the CG asset always use “plus” in your merge for lights and always use “multiple” in your merge for shadows.
There are different types of AOVs (Arbitrary Output Variable)
Material AOVs these used to adjust the material attributes or shader of objects in the scene like using the passes so you have control over highlights, mid-tones and shadows.
With LightGroups, we can adjust the Individual lights from a 3d scene.
Data Passes also known as Utilities, in combination with these tools can be used to achieve various effects like defocus, motion blur, re-lighting, and many more.
IDs help to select an area
The layer Contact Sheet node lets you view different passes on one screen.
Different renders from different software will be having different passes so when changing any highlights, mid-tones and shadows you needed to back it up by using a shuffle node.
We can add UV texture in Nuke with the UV passes, by rendering the geometry. You start with your geometry then add whatever texture you want directly to the scanline render. The other way is to add UV geometry scanline, render it and then to STMap to stamp channel and add the render src for the texture
The position pass represents the 3d scene in colour values. Red is the x coordinate, green is y, and blue is z. You can use a PositionToPoints node to visualize it in the 3d space. A depth channel stores the distance from a point in 3d to the position of the camera (and will be moving with the camera).
PP Mask hub is a gizmo in which you can select a part of the plate and with the help of a position pass and relight an area, it is a simple way to do it and this also can be done using a normal pass.
For our homework, we had to add a car to a background of our choice and match it to the background.