This week I focus on environment creation, adding a foggy& mysterious atmosphere to the scene and making the color tones of all objects as consistent as they can be.
My Responsibility for Week 6 (shot 1& shot 4)
Sky Replacement
Background Fog Integration
Foreground Fog Generation
Refine Roto
Obelisk Integration
Overall Color-correction
1. Sky Replacement
Basically, there are two ways to replace the sky depending on the shot's moving angle and perspective. Either of them needs a camera in order to match the sky footage with the camera moving.
Card Replacement
Sphere Replacement
Firstly, we need to use the keyer node to extract the bright part of the sky as the alpha channel
The first way is to project the sky image onto a card, which is suitable for the shot without significant camera movement. The second way is to project the sky image onto a sphere, which is preferable when the shot has a perspective change. In this specific shot, the sphere has much more advantages than the card, since it works better both for the close-up shot and the long establishing shot.
The long-distance shot.
2. Background Fog Integration
The way to create background fog is very similar to the sky dome. The only difference is the fog, which is dynamic footage that has a certain frame range. Before compositing the footage into the scene, I use time clip & time offset nodes to do time remapping, merging two clips of fog together in order to fit the length of the shot.
3. Foreground Fog Generation
The foreground fog is the combination of constant white and noise nodes, noise node is super handy to create clouds, dust, and fog, and simply adding some keys can make the fog move with the wind.
Foreground fog generation
4. Refine Roto
Roto is always a very tough task for this shot because the actor moves a lot with his arms, therefore, before putting the obelisk into the scene, I need to roto his arm, and separate it from the original background.
5. Obelisk Integration
The obelisk bottom looks very bright that not fit the color of the scene. I need to color-correct the bottom part first and make sure it moves stable with the trace of the obelisk. In this case, I use the tracker node to track the point of the obelisk and give the transform_matchmove node to the roto.
Therefore, the color-correction node will follow the trace of the obelisk
6. Overall Color-correction
Before Color Correction
After Color Correction
The Next Step
Flag Integration
Grass Integration
Facial Cracking Effects
Obelisk Effects
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