VFX with Natron - E0084 - Radar Scope
In this episode we are going to explore how we might go about making a radar scope that we can feed pretty much anything as a signal, and have our source reveal as the radar scope sweeps around. We will add a blip or two and maybe a noise pattern, but ultimately we are going to make a count down that changes with each sweep.
A note about motion blur for clarity: The soft faded edge typically associated with motion blur is caused by overlapping bits of the previous and next frames of something moving; however, in the case of a thin line like a sweep, the distance the "after glow" lasts is much, much further than the distance the sweep moves between frames. All increasing length of motion blur greater than the width of the thing being blurred results in a linear average of the blur., and not giving us a soft edge. We see this in the video when I failed to add sub frame motion blur on our first transform node early on. The reason we can't use motion blur is because it has control to adjust it's decay, and is the reason we use the frame blend node in this video. I hope this clarifies the issue so people are not confused why we eventually add motion blur when I say early on it won't work.
Contents:
0:00:00 - Intro
0:00:16 - Preamble
0:01:07 - Today's Goal
0:01:45 - Potential approaches
0:03:16 - Building the sweep & after glow
0:03:25 - Sweep shape
0:05:13 - Creating the after glow
0:05:45 - After glow rotate expression
0:07:43 - Frame Blending to generate the after glow
0:10:02 - Decay is the key to the after glow (Note: Sum fix found @ 0:34:50)
0:13:02 - Cache the after glow to speed up render time
0:14:08 - We only need to build the after glow once
0:15:17 - Animate the sweep & after glow
0:15:35 - The animation expression
0:16:40 - Fixing the NaN Error (Important: use a constant not solid)
0:19:08 - Setting up the sweep layer
0:20:00 - Clamp the after glow
0:20:22 - Dim after glow for the sweep
0:21:28 - Merge sweep layer over it's after glow
0:21:42 - Building outer ring (Note: Adjust if one wants a more complex scope)
0:23:40 - Final scope look
0:24:06 - Creating scope content (blips, noise, numbers or whatever)
0:24:27 - Intensity control for scope content (Important: enable alpha checkbox! Fix @ 0:43:45)
0:25:02 - Evaluating blip glow (skippable as issue fixed later)
0:26:47 - Making a blip & other content
0:28:42 - Merging after glow IN blips
0:29:15 - Fixing the In issue (replacing the solid with a constant - skip if done @ 0:16:40)
0:30:23 - How the blips work
0:30:46 - Clamp to prevent over/under driven content
0:31:04 - Increase blip after glow fall off speed
0:31:23 - Evaluating the initial blips (skippable)
0:32:27 - Putting blips onto the scope
0:32:34 - Evaluating effect
0:32:50 - Noting brightness issue (skippable. Fixed by note @ 0:24:27 or @ 0:43:45 in video)
0:32:53 - Blip hardness (optional/skippable)
0:34:40 -Trouble shooting the brightness alpha issue (skip if fixed @ 0:24:27)
0:34:50 - Fixing the SUM issue, transform node missing motion blur!
0:35:13 - The important motion blur settings!
0:35:35 - Shutter angle of 1 (360 degrees) to give us a frame to frame linear blur
0:35:59 - Evaluating sum with motion blur, that issue is FIXED!
0:36:57 - A nasty little refresh (minor black out evaluation issue, skippable)
0:37:56 - More trouble shooting the blip brightness (skippable)
0:41:09 - Color the scope green (or what ever color one wants)
0:42:12 - More trouble shooting the blip brightness (skippable)
0:43:45 - Fixing the brightness alpha issue! (Fixed noted at @ 0:24:27)
0:44:21 - Understanding how the blip brightness control works
0:45:26 - Why a blip brightness of 20 in our case?
0:45:56 - The second goal of the day discussed
0:46:04 - But fist lets scope some noise or whatever
0:47:39 - Starting the countdown
0:47:59 - Lost reference (very skippable)
0:48:34 - The initial number and it's position
0:50:08 - Evaluating the number glow duration
0:50:35 - Time we will change the number
0:50:54 - Get the reference reloaded (skippable)
0:51:20 - Real text Position
0:51:35 - The number changing expression
0:56:15 - Evaluating the count down
0:57:00 - Noticing a sweep alignment error
0:58:09 - Verified the offset error
0:59:30 - Starting to fix the offset error, but stuck waiting for the disk cache.
1:01:30 - Offset rotation by -1 degree
1:02:15 - Attempt to evaluate offset fix (skippable)
1:04:31 - Using region of interest to evaluate much, much faster
1:05:55 - The 11th issue
1:06:30 - Missing node (skippable)
1:08:10 - Transitioning the initial blip number
1:09:31 - Evaluate initial number blip
1:09:48 - Noting and fixing the Shifting RoD and Alpha isses
1:11:00 - Evaluating again, and talking about an approach to another transition type
1:13:30 - Changing the project length to 792
1:16:33 - Reviewing today's goal
1:17:13 - Thanks for watching and outro
The project files for this video are not ready yet.
Live stream from June 5, 2021
With: Pirate Bill
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