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Post by greypilgrim on Jun 29, 2017 1:22:44 GMT -9
For anyone who can advise me... I'm working on skins for a spaceship, and I'm wanting to add some "reentry" burn streaks to show wear and tear on the craft. I've searched for brushes that might be "ready to go", but the closest thing I can find are "running paint drips".
Could someone direct me to some brushes that would be suitable for this, or give me some tips on how to make my own? Modifying the paint drips might be a solution, but I'm not sure I can get them modified to get the look I want. Thanks in advance.
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Post by Vermin King on Jun 29, 2017 4:28:57 GMT -9
My solution probably isn't that great. I attempted (acceptably, but not great) to do this on a spaceship a while back. I found some burn streaks on another model. Cleaned up around the marks, so only the scorching was left. I then pasted this on the ship, resizing, adjusting opacity, contrast and brightness, until it looked correct.
Unfortunately, I deleted the file when I finished (actually didn't save the file in Gimp, so I couldn't go back and pick it up as a recently deleted file)
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Post by lightning on Jun 29, 2017 8:36:26 GMT -9
that's how I would approach it:
0. Make a dot/circle on a white layer. 1. Filter-Noise-Spread ... to make it fuzzy as needed 2. Filter-Distorts-Wind ... play with options to get the right length (this only goes left or right, so you have to rotate result as needed) 3. Filter-Noise-Spread (again)
Make a couple of variations with more or less noise, different length or dot size to begin with and then combine them with different blur/opacity levels (probably with multiply).
Due to the nature of the Wind-Filter the result should be a straight "streak". To make it not straight, use the Filter-Map-Displace function.
Hope this helps Chris
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Post by greypilgrim on Jun 29, 2017 16:13:49 GMT -9
Thanks for the reply, lightning. I will try that approach for my next iteration... Meanwhile I had spent most of the day and cobbled up this WIP. Bear with me for the details of my procedure, but as always, it is for review and comment - or anyone who is hard-nox headed to try this approach on their own. Okay, after running through some descriptives from a few reference sites of what some of the GIMP Tools did, I did some experimentation to see if I could get anywhere close to what I was wanting. I started with a transparency layer as this was an effect I wanted lain over an existing texture. Since I was working in detail, I applied a quarter inch grid and zoomed in to work with a 2-inch wide swath. To make my base brush swaths, I used these settings: PaintBrush - Opacity 100, Brush Sponge 01, Size 25, Aspect Ratio 10.0, Angle +136 Dynamics - Fade Options -Fade Length - 100 px, repeat - none Color Options - FG to BG - rest unselected This process gave me my main background 'scuffing' of various lengths. I applied a straight 'cut off' across the beginning (darker) end of the image as this was going to be at the lead edge of the hull plates.
I used Burn to lighten at the Chaulk01 setting making some thinning streaks with Brush at Hardness 025 (this is the smallest of the 'fuzzy orbs' where the center is darkest getting less dense towards the rim in the default GIMP set of brushes), at Size 19 with Aspect Ratio and Angle reset back to 0.
Then copy/pasted a portion of the 'baseline' a couple times across the start position - to even out the thinner starting line of squares for a bit more evenness across the baselinestarting area (I figured there shold be a 'minimum' amount of scuff before it tapered off) . This did result in a couple of spots were there was a dicernable demarcation line, but this was solved by some judicious rubbs and lightenings.
(And, YES, I saved the entire process at various points on my overall page!)
Drawing a box around the entire artwork, I applied a Perspective with Normal and Cubic Interpolation, stretching one trailing corner way out to vary the general layout from what I had originally drawn so I would definitely have at least one longer streak than the and otherwise vary them. (I tended to drag my original brush 'lines' in lengths that where too even to my asthetic taste, as I realized by this point.)
Then I created a second transparency layer above that and pasted some versions of a couple of different long, basically straight, brush lines to givce the effect of some harder strikes. When I was satisfied with those in number, modified length and dispersity, I merged the upper layer into the first.
Then I pasted a copy of the work to one end to make it longer, sliding the overlap to get a 'clean' looking flow across the baseline length.
After a couple of other little fiffles, I reduced the size to a manageable baseline. But applying it to my ship skin - which greyish to start with - I realized it didn't show up well. So after a few passes of Burn on Shadows I got a darker effect, then applied again. The scorches seemed too short, so I extended the length of them with the Scaler to get a suitable feel (but not linked to extend the baseline). This stretching also helped make it look a little more 'streaked'! ... and still needed to lighten the tails and darken the baseline area.
That's the gist of what I did to get this: The scale is 3" L-R for the larger of the grey textured area; 2" for the section the burn marks are applied to. [Yeah, I know, dangled participle...] There's things I will change, but this was sufficient for me as a WIP for demonstration.
s109.photobucket.com/user/greypilgrim_01/library/08%20TRAVELLER%20Scout-Courier%20100dT
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Post by lightning on Jun 29, 2017 21:35:54 GMT -9
looks great! there is always more than one way :-) fading brushes is a great idea.
looking forward to your finished result!
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Post by nullpointer on Jul 5, 2017 14:32:33 GMT -9
Photoshop has a filter called Wind that makes smeared streaks that could look like heat burns or rust streaks. Based off this post on gimp.org, there seems to be something similar, so maybe you can get it to work. Here's how I'd do it: - The filter (assuming it works the same in GIMP as in PS) smears light areas of the image into dark or transparent areas. If you want dark streaks invert the colors first.
- Rotate the affected section because the streaks can only be made left to right or right to left, you can rotate it back after the effect is applied.
- Use the Wind filter as noted above, to make streaks in the direction you desire. It should do it where bright white areas have more and longer streaks than areas with lower contrast.
- Repeat the filter until you feel it's sufficiently streaky.
- Rotate back the section to the correct orientation and re-invert the colors to their original state.
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