Two more Fuses, this time some really simple ones that convert multi-channel images to mono-channel and back again.   Color is overrated, in general, and I find myself getting a lot of use out of these.

Color to Mono

Mono to Color

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The latest builds of Fusion (>475) allow fuses to work with canvas color and ROIDS.  I thought I’d try that out on my Invert fuse, and it seems to work just fine.  You now have the option of whether or not to invert the canvas color.  The ROIDS support makes what was a pretty fast fuse into something even faster under most situations, and it won’t break a nice DoD-managed comp.

As time permits, I’ll go through my other fuses and add similar functionality.

Absolute Value

I’m often trying to find the magnitude of something, regardless of sign.  Commonly done for things like normals or velocity or distance.  You would expect there to be a built in tool for that sort of thing, but there isn’t.

Previously,  I did it with a CT or a Fuse operating on a per-pixel basis.  An f.Color.rgb = abs(f.Color.rgb) sort of thing, which is pretty slow in Fusion as a CT or Fuse, but is plenty fast in Cg.  More on that later.

Today I had an idea on how to do it with a matrix.   The basic idea is to scale the the image by .5, and by -.5 and find the difference of the two.  So |x| = (.5*x)-(-.5*x)

This method is much faster.  The resulting Fuse runs about 40% faster than a CT, and several times faster than the old Fuse I had made which operated pixel by pixel.  Unfortunately, ROI isn’t supported yet for Fuses, so if you have a tiny ROI, the CT or the CMx’s will both run faster.   EDIT: ROIDS can be supported in Fuses…  I’ll need to add it to the Fuses I’ve posted so far.  Stay tuned…

So here’s the Fuse, a Cg ViewShader that lets you view the absolute value in a Viewer, and an example comp showing the CT, Fuse, and CMx methods, as well as the ViewShader.

Download FAbsolute Fuse 1.05

Download Absolute Value Viewshader 1.01

Download Example Comp (Absolute Fuse) A01

It would be interesting to see if the disparity between the speeds  of processing the matrix vs per-pixel goes away when you compile a c++ plugin…

The Proxy features of Fusion work great for their simplicity, but sometimes you need a bit more control.  We’re all about the control…

Cropped compare of anisotropic proxy of a 4k plate

Along those lines, we’ve taken to using an inline proxy setup that provides some benefits over the built-in proxy.  It’s based around the assumption that tools take into account the pixel aspect ratios, which differs from the code branching that occurs with proxy, so you may not get correct results, but it’s also shows when tools are improperly handling pixel aspect ratios.

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Oh look, another post where we do something off the wall using nothing but Fusion’s standard toolset!

In this case, I had an idea for a plugin and needed a way to explain the concept to Ben and Matt.  Basically, I wanted to find the largest “object” in an image, and this is the comp I came up with.

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I was working on a little job today with a 2D temporally variant scalar field.

You know, B&W footage.

I needed to find the parts of the data that were changing the most and compare them to the overall data and the maximum delta.

What I ended up with, once Ben pointed it out to me, was a simple example of calculus laid out in a couple tools.   The simplest case is just taking the frames I have and interpolating the same number of frames, so there’s no missing samples.  It’s silly, really.

But you can try it with other sampling, so there’s also an example of a Sobel filter, with a 1D kernel perpendicular to the normal 2D one.  Cute really.

If you checked out my interactive smoothing comp, you can see how I used a Sobel filter to make the forward facing laser pointer by looking at the differentiation of the R and G channels over time.  Same idea, just different way of expressing the temporal dimension.

I’m tossing in a Laplacian filter too, just for fun, it’s not useful for the calculus part, but it was easy to do, and shows how you can change the kernel to make different effects.  It’s possible to also evaluate 2D or 3D kernels this way, too.  The temporal offsets can be combined with spatial offsets so you could make a 3D blur filter, or a 3D sharpen.  Or a 3D Unsharp Mask, as I’ve also included.

Ok, so this one uses a free plugin, but if you REALLY wanted, you could make it with just Fusion tools.  Exercise left to the reader though, especially those poor Rotation users.

Unlike the previous example, this one does NOT bake out all the animation to one image, but instead uses an animated image to represent the data over time.  This makes it interactive and allows it to work with motion blur.

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Another in what is turning into a series of posts where standard Fusion tools are transformed into something very interesting…

I’m smoothing animation data (or adding noise or offsets or whatever) using nothing more than some Probes.

In this video, the green dots represent the original animation, the blue dots the smoothed animation, and the orange is the original with some noise added.

New Quick Tips:

Fusion:

7.  Stop Squinting! Ctrl-mousewheel will make the fonts used in text entry boxes larger. -Chad
8.  Itty Bitty 3D! Change a viewer to 3D, then turn on the 3D SubV.  Now you can put any 3D tool in that SubV, and set the main view to 2D. -Chad

3ds Max:

1.  Mouse Chase! You can truck a view so that it centers on your mouse point with the “i” key.  Interactive viewport pan I think is what the kids call it.  Nice thing is that you can do it whenever, so even if you are in the middle of a modeling operation, you can change the view, allowing you to zoom in really close, but still cover a wide area.    -Chad

We keep a running list of these tips up there between “Tools” and “About”.

Here’s a little attempt at making a 3D vectorscope using particles.  It’s cute like the centroid comp, elegant and simple with no plugins or fuses needed.   Nothing wrong with fuses or plugins, it’s just neat to be able to have something that works for any using Fusion 5.2 or later without anything else, and lets you see what Fusion can do out of the box.

3D Vectorscope Fun!

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