| --- Log opened Wed Sep 11 00:00:24 2019 |
| 00:33 | | himi [sjjf@Nightstar-1drtbs.anu.edu.au] has joined #code |
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| 00:52 | | * Derakon stares at this shader. |
| 00:53 | <&Derakon> | Let's say I want a texture sampling effect to fade out towards the edges of the texture, because it's smaller than the object it's being applied to and I don't want to get the unrealistic clamping/repeating/etc. effects that you get when off the edge of the texture. |
| 00:53 | <&Derakon> | So I have rippleUV which is an X/Y pair each in the range [0..1]. |
| 00:53 | <&Derakon> | So I do: |
| 00:53 | <&Derakon> | float dx = 2 * (rippleUV.x - .5); // Range 0-1 |
| 00:53 | <&Derakon> | float dy = 2 * (rippleUV.y - .5); // Range 0-1 |
| 00:53 | <&Derakon> | float distSq = (dx * dx) + (dy * dy); // Range 0-2 |
| 00:53 | <&Derakon> | float rippleScale = 1 - (distSq / 2); // Range 0-1 |
| 00:53 | <&Derakon> | And then multiply my texture effect by rippleScale. |
| 00:54 | <&Derakon> | With the idea being that rippleScale should be 0 when rippleUV is near 0 or 1 for either X or Y, and 1 when they're both at 0.5. |
| 00:54 | <&Derakon> | Any errors in my math? Because it's not working. |
| 00:56 | <~Vornicus> | dx is -1 to 1 |
| 00:57 | <~Vornicus> | similarly dy |
| 00:57 | <&Derakon> | ...yeah, and dividing by 2 isn't really valid to rescale distSq. |
| 00:57 | <&Derakon> | Because I want the scale to be 0 if dx = 1 and dy = 0, for example. |
| 00:58 | <&Derakon> | This seems OK: |
| 00:58 | <&Derakon> | float dx = 2 * (rippleUV.x - .5); // Range -1 to 1 |
| 00:58 | <&Derakon> | float dy = 2 * (rippleUV.y - .5); // Range -1 to 1 |
| 00:58 | <&Derakon> | float distSq = (dx * dx) + (dy * dy); // Range 0-2 |
| 00:58 | <&Derakon> | float rippleScale = saturate(1 - sqrt(distSq)); // Range 0-1 |
| 00:58 | <&Derakon> | (`saturate` is a shader function that clamps to the range [0..1]) |
| 00:59 | <~Vornicus> | with the caveat that it will now look clearly conical |
| 00:59 | <&Derakon> | I'm not a fan of the sqrt but I don't actually know how big a deal it is. |
| 00:59 | <&Derakon> | Conical isn't ideal but I doubt it'll be noticeable. |
| 01:03 | <&Derakon> | What I'm working on is having ships create wakes, by distorting the water using a special texture. |
| 01:03 | <&Derakon> | So imagine all of the water off the edge of the texture in a particular direction getting distorted. |
| 01:03 | <&Derakon> | It looked weird. |
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| 02:48 | <@Reiv> | snrk |
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| 03:40 | < Pink> | What sort of mesh are you putting it on? |
| 03:44 | < Pink> | In my own ripple thing I just vignetted the distortion texture. Probably not as performant, but much easier. |
| 03:45 | < Pink> | Though not sure I'd do that if I recreated it now |
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| 04:42 | <&Derakon> | Pink: the ocean mesh is, uh, 326k tris, and then tessellated on top of that. |
| 04:42 | <&Derakon> | Fair point on the vignetting, oh well. |
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| 04:59 | <@Alek> | Derakon, if you want a little more realism, you might want to base the angle and length of the wake on the speed of the boat and the angle of its prow, which I believe are what affect it IRL. should, in theory, be a simple matter of deforming the texture appropriately... |
| 05:00 | | * Alek shrugs. |
| 05:05 | <&Derakon> | Alek: yeah, that's planned. Just a matter of fine-tuning. |
| 05:27 | | Derakon is now known as Derakon[AFK] |
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| 07:04 | <@Alek> | cool |
| 07:12 | | * McMartin starts attempting to break Xcode in earnest |
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| 10:15 | <~Vornicus> | Ok. In order for this to work, I have to force a swap, and then reset the swap targets. |
| 10:16 | <~Vornicus> | the forced swap is on the longer of two finite lines on a finite degenerate triangle that are attached to the new point. |
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| 11:52 | <~Vornicus> | In order to make this work I thus have to check - before doing any attempted corrections - that I'm actually in the special case here |
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| 13:56 | <@abudhabi> | Sweet. New work laptop GET. |
| 13:56 | <@abudhabi> | Now to copy the 79 GB virtual box on it. |
| 13:57 | <@abudhabi> | Fortunately, I had a spare wired switch, so it'll only take a couple hours. |
| 14:35 | <@abudhabi> | Good thing WinSCP supports resuming... |
| 14:35 | <@abudhabi> | ...because FUCKING WINDOWS decided it was the right time to reboot without permission, probably to install some bullshit update since it detected that I wasn't actively mouseclicking anymore. |
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| 16:58 | | Mango [Frankie_Boy@Nightstar-hqmi86.abhsia.telus.net] has joined #code |
| 16:58 | | * Mango waves to the room. |
| 16:59 | < Mango> | Is there any way to write an extension for Firefox or Chrome that causes YouTube to full screen to a specific monitor? |
| 16:59 | < Mango> | Use case: we want to cue a video on the laptop's internal display, but have it full screen to a projector, without having the audience see us drag the window up there. |
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| 17:07 | <&jeroud> | Aaaaaaaaaaaaaaaaaaaaaaaaaa! |
| 17:07 | | * jeroud takes a breath. |
| 17:08 | <&jeroud> | Aaaaaaaaaaaaaaaaaaaaaaaaaa! |
| 17:08 | <~Vorntastic> | ????? |
| 17:08 | <&jeroud> | This panicking brought to you by the last several times I've tried to do anything with browser extensions. |
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| 17:10 | <&jeroud> | Vorntastic: I'd paste Mango's question, but I'm on my phone which makes it much more difficult. Sorry. |
| 17:10 | <~Vorntastic> | I saw it |
| 17:10 | | * Mango hugs jeroud |
| 17:11 | <&jeroud> | Mango: If you have the projector set as the primary display, clicking the fullscreen button on the video might do it. |
| 17:11 | <~Vorntastic> | Was looking up windows shortcuts for moving windows around but the specific one I wanted wasn't there |
| 17:11 | | * Mango has never written a browser extension before. |
| 17:11 | <&jeroud> | At least, it does that for me on OSX. |
| 17:11 | <~Vorntastic> | It does not on Windows, instead full-screening where it is |
| 17:12 | < Mango> | Vorntastic: You gave me an idea. I wonder if I could use AutoHotkey to detect that a YouTube video was full scrren. |
| 17:12 | | * Mango Googles |
| 17:12 | <&jeroud> | Maybe use youtube-dl to turn it into a local video file? |
| 17:12 | < Mango> | Unfortunately it's a live stream. |
| 17:12 | < Mango> | "Unfortunately" for many reasons. |
| 17:13 | < Mango> | This is just one of them. |
| 17:59 | <@abudhabi> | Hm. I'm connecting two PCs (win10 and mint) via a wired switch. But I'm unimpressed by the upload speed - it's like 11.4 MB/s. This seems a bit low. |
| 17:59 | <@abudhabi> | Why might this be? |
| 18:00 | <@abudhabi> | Both machines have modern disks. |
| 18:00 | <@abudhabi> | (HDDs.) |
| 18:06 | <@abudhabi> | The switch, perhaps? |
| 18:11 | <@abudhabi> | 100 Mb/s is 12.5 MB/s, after all. |
| 18:28 | <&jeroud> | 100Mbps network seems likely. |
| 18:28 | <&jeroud> | But disks can also be slow. |
| 18:29 | <&jeroud> | Especially if they're spinning rust and there's lots of fragmentation. |
| 18:35 | <@abudhabi> | Not likely. One is a month old, the other might be used, I don't know, but it has a new system after a wipe on it. |
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| 21:38 | <@Alek> | 100Mbps switch seems the likely answer, then. |
| 21:38 | <@Alek> | or a 100Mbps port on one of the machines. not everything, even new, has a gigabit port yet. |
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| --- Log closed Thu Sep 12 00:00:26 2019 |