City of Heroes Digest

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Castle Re: Last Gasp 28 Jul 2009 00:37
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Castle Re: Jeffster at Comic Con 28 Jul 2009 00:32
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BackAlleyBrawler Re: Comic Con Panel - new videos 27 Jul 2009 20:16
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BackAlleyBrawler Re: Comic Con Panel - new videos 27 Jul 2009 20:04
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Castle Re: Comic Con Panel - new videos 27 Jul 2009 17:32
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Castle Re: Comic Con Panel - new videos 27 Jul 2009 17:25
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BackAlleyBrawler Re: I'm beating Posi and BaBs!!! Ha! Ha! 27 Jul 2009 17:01
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david_nakayama Re: Starting the CoH/CoV Tarot Deck... 27 Jul 2009 16:36
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Positron Re: Comic Con Panel 27 Jul 2009 03:27
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Castle Re: Comic Con Panel 27 Jul 2009 00:21
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Castle Re: What is this game smoking? 24 Jul 2009 18:30
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Castle Re: Super Hero inspired songs. 24 Jul 2009 17:54
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BackAlleyBrawler Re: Color Customization 24 Jul 2009 02:14
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BackAlleyBrawler Re: Power Customization F.A.Q. 24 Jul 2009 01:54
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Castle Re: Super Hero inspired songs. 24 Jul 2009 01:35
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Sunstorm Re: Powerset Prolifera: The darkness is not coming 24 Jul 2009 00:17
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Sunstorm Re: Powerset Prolifera: The darkness is not coming 23 Jul 2009 23:54
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BackAlleyBrawler Re: Color Customization 23 Jul 2009 20:55
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BackAlleyBrawler Re: Color Customization 23 Jul 2009 17:51
Quote:

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The powerset has a color choice box -- 'Default', 'Custom', 'Bright [power]', and 'Dark [power]' (i.e., 'Bright Fire' and 'Dark Fire'). When you pick 'Bright', you get additive color changes -- the colors you pick brighten the power (i.e., the standard Energy Blast colors are 'Bright'), and when you pick 'Dark', you get subtractive color changes -- the colors you pick darken the power (i.e., the standard Pain Domination is 'Dark').




Could you expand on this a bit? Maybe because it's because I'm tired, but I don't fully understand what this means.



Let's see. You see things in particular colors because the objects selectively absorb and reflect light of different colors. Leaves are green because they absorb red and blue light, reflecting the green light; a white object reflects all the light that hits it equally.

There are two color systems -- additive and subtractive. Additive color is the way light works, and its primary colors are red, green, and blue. If you have a white object and you shine a red light on it, it looks red, because even though it reflects all colors, it only has red light to reflect. If you shine a green light on it as well, it looks yellow, because that's the color of a combination of red and green light as your eyes see it.

Subtractive color is the way paints and dyes work; in subtractive color systems, the primary colors are cyan, magenta, and yellow (notice that these colors plus black are the ink colors in a color printer -- the CMYK system), more inaccurately described as red, yellow, and blue. Each color absorbs all the colors but the one it reflects, so to get green, you mix cyan and yellow.

The additive colors are like shining a colored light onto a white-colored power effect -- if all you shine on the power is a fully-saturated blue, it will never get darker than a fully-saturated blue; if you reduce the intensity of the blue by adding other colors, the light gets whiter and the blue power gets paler, turning back to white. The subtractive colors are like drawing over the white-colored power effect with a marker -- if you use a fully-saturated blue, it will never get lighter; you reduce the intensity of the blue by adding other colors, which makes it darker, making the power effect darker overall, so the color fades toward black.

Or you can just think of it as a double-wide color palette where the "Bright" colors take you from saturated color toward white, and the "Dark" colors take you from saturated color towards black, but there wasn't enough room on the screen to fit both, so you have to pick one or the other, with both the primary and secondary colors having to be from the same set.

I'll have to see about dragging my digital camera to the con and getting some screen shots of the difference.




All computer graphics use an additive color model, as that's ultimately how computer monitors will display the image.

As for blend modes, we use Additive, Subtractive, and AlphaBlend for our VFX:
http://en.wikipedia.org/wiki/Blend_modes
http://www.modwiki.net/wiki/OpenGL_Blendmode_%28Materials%29

That fist page is more geared toward image processioning software, such as Photoshop, but the basic principle is the same and it's a bit easier to read and comprehend (ie, has pictures). We're composting pixels on top of the scene that's already been rendered, and the blend modes are just the formulas that tell the engine what to do with the source and destination to get the final result.

The second link is for some basic OpenGL blend modes, and you can see the exact formulas used to derive the final output for various blend modes. Our instruction sets aren't exactly like the examples provided there as we have to incorporate dynamic values for RGB and alpha rather than simply taking a texture and rendering it onto the framebuffer.

Edited by BackAlleyBrawler (07/23/09 01:59 PM)

Castle Re: Gauntlet 2.0 22 Jul 2009 19:09
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Castle Re: Okay, devs... the Pivot Questionnaire for you 22 Jul 2009 18:52
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Castle Re: The Devs Hate... 21 Jul 2009 21:38
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Castle Re: The Devs Hate... 21 Jul 2009 21:08
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BackAlleyBrawler Re: New powerset priorities 21 Jul 2009 17:18
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BackAlleyBrawler Re: Discussion - Presenting Issue 16: Power Spectr 21 Jul 2009 02:39
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