This is a very useful method about removing the edges of the clip.
If the material we’re using has edges like this, we can clean them up by using the “merge alpha” method.
We can still modify the background, for example, if the background of the clip is white, add constant. if the background of the clip is black (transparent) add luminance to improve the alpha.
First, use Blur and Multiple and Cornerpin to create the light and shadow of the flame on the ground and the light and shadow on the glass.
Second, we need to make the background deformation when the flame writhes.
This step is to use roto to separate the parts that need to be twisted
curvetool： This node helps us make the flame flicker throughout the scene
Click on CurveTool, copy its data, create a Grade, and paste it onto it.
It must be remembered that if you want to modify the brightness, you need to go to edit expression to a certain number.
Batch Size: Leave it automatic.
Crop size: Smaller crop Faster to train, is only aware of smaller details
Use or 256 or 512 for better quality.
Log2Lin4：typically used to convert an image from a logarithmic color space to a linear color space. This is a common operation in the compositing process, as the logarithmic color space is better suited for images with a wide dynamic range, while the linear color space is better suited for compositing operations and adjustments.
Check point. You can link other data set with similar content in your training.
Change the RGB channel in the shuffle and connect the mask to the grade, so that the roto of the eye is reflected.
Particle in nuke:
ParticleTurbulence: change the particle direction and add some blur.
Test of head:
Edgedetect：This node helps me extract the edges of an object, but only if the object is alpha-able.
Connect this node with “grade” to adjust the value of gain to change the brightness and color of the edges, which is very suitable for some cool video effects.
IDistort：This node regulates the shape of the border that has been processed, deforming it and giving it a dynamic feel.
Glint：This node is used to help the overall glow and to change the direction of the light source.
First it was done for the character roles in the foreground and then the background. And next the form of processing in different ways is described (about Gizom)
These are two very important nodes.
However, the gizom node can replace these nodes above (edgedetect and grade and so on)
-Develop a matte painting in Photoshop
-Build a 3d environment to project on PSD
Techniques and tips
I tried keying in PS using the pen tool and combining them and finally exporting a psd file into nuke
I did the keying in ps and divided it into three different layers, but I imported it into nuke and realized that one layer was missing. I spent a long time, finally found the reason, because I can’t use the ortho stack in ps, so the effect can’t be applied to the nuke, so in the end can only show two layers in the nuke, in the future, or need to key each picture, in order to achieve the perfect effect.
Finally, I can create a “projected camera” and add “cards” to arrange the position of each layer to make the spatial effect more visible. matte painting is usually used to create large parts of a movie, and I think it’s very useful for me, and I’ll use it in my personal projects.
In this assignment, I followed the steps required by the instructor step by step, which helped me to understand how a complete synthesis process works.
For example,
1. I need to stabilize the lens and add “lens distortion” which is a very important step to reduce the distortion of the lens and make the composite image more professional.
2.clean the markers in the original video clip, by using “rotopaint” and “frame hold” together.
3.Modeling the mechanical model in Maya. At the beginning, gonzalo suggested us to find some reference images, which really helped us to understand the model. In particular, when I was modeling I would look at the reference drawings, which gave me more detail.
4.I used Houdini to create the lightning effect, this was a very challenging step. Houdini is a very difficult software in my opinion, I needed to combine it with some tutorials on the internet to realize my idea, especially the “line” node was very useful.
5.Last but not least I made some ice crunching effects in ue5 and imported them into nuke, but I rendered them without shadows, which made my effects look very fake. So I added another layer in nuke and changed the value of “grade” and added “blur”.
I tried to tweak the green screen background with the nodes given by gonzalo. Regarding the treatment of the hair, I had to select an “IBK Color” node and choose dark and light colors of G (green) to show as much detail as possible in the hair. I can also use the “Filter erode” to eliminate noise. It’s worth noting that it looks very realistic and I used the Luminance node to subtract the snowflake from the background and place it in the foreground so it looks great.
“Shuffle” usually refers to a feature used to reorder channels. In Nuke, the Shuffle node allows you to control how pixel information is assigned to different channels. The channels include Red (R), Green (G), Blue (B), and Transparency (A)
When you are done rendering your model using maya, it will help you to export many different layers such as ID layer, Shadow layer, Metal layer and so on. Then import them into NUKE and use the shuffle node to separate them for tweaking, which is handy because you don’t need to re-render them, saving a lot of time.
When I adjust the “point” node in nuke, it’s like a light source, when I move it to a different position, the light of the object will be affected.
First, adjust the rgb channel in the “shuffle” and add a mask to show the local color.I’m not too sure about this part, but I’ll do it in the “garage” project and learn how to adjust the local color.
LayerContactSheet allows you to layer the rendered image, tiling it to show multiple different passes.
The Objective of unbuild the beauty and rebuild it via the passes (channels) is to have an higher control of every pass and grade it according to the background image.
To replace a node, Ctrl+Shift and drag the desired node onto the old node for a quick replacement.
As I was completing this part of the assignment, I ran into some difficulties. For example, the cornerpin didn’t match the roto part so I had trouble tracking the texture to the wall I needed to cover, but I found that adding a transform node didn’t affect the overall movement, so that was a good way to get the assignment done.
For the first time, I continued to use the “frame hold” with the “card” method, but I found that it didn’t work. So I went back to the first semester’s “roto” and overlayed each frame.