Comments on: Mini-tutorial: Additive Blending http://www.flight404.com/blog/?p=71 Sat, 04 Sep 2010 16:55:46 -0400 http://wordpress.org/?v=2.8.6 hourly 1 By: Eyal Ohana » Blog Archive » ICM final WIP - programming an organic particles system http://www.flight404.com/blog/?p=71&cpage=1#comment-105442 Eyal Ohana » Blog Archive » ICM final WIP - programming an organic particles system Wed, 10 Dec 2008 06:17:16 +0000 http://www.flight404.com/blog/?p=71#comment-105442 [...] mode done, through openGL render from processing, I followed a clear but not too explanatory tutorial on the flight404 blog. The additive blending does achieve a more interesting composite but also results in aliasing of [...] [...] mode done, through openGL render from processing, I followed a clear but not too explanatory tutorial on the flight404 blog. The additive blending does achieve a more interesting composite but also results in aliasing of [...]

]]> By: links for 2008-10-30 http://www.flight404.com/blog/?p=71&cpage=1#comment-104746 links for 2008-10-30 Thu, 30 Oct 2008 22:42:31 +0000 http://www.flight404.com/blog/?p=71#comment-104746 [...] all manner of distractions » Blog Archive » Mini-tutorial: Additive Blending (tags: Programming howto Graphics blog design Java development tutorials generative processing OpenGL tutorial) Visit my other sites: Photo Gallery | Insane in the Membrane | Main website « links for 2008-10-29 [...] [...] all manner of distractions » Blog Archive » Mini-tutorial: Additive Blending (tags: Programming howto Graphics blog design Java development tutorials generative processing OpenGL tutorial) Visit my other sites: Photo Gallery | Insane in the Membrane | Main website « links for 2008-10-29 [...]

]]> By: christianmeinke.com » Blog Archive » Textured Surfaces http://www.flight404.com/blog/?p=71&cpage=1#comment-18068 christianmeinke.com » Blog Archive » Textured Surfaces Tue, 12 Jun 2007 12:05:22 +0000 http://www.flight404.com/blog/?p=71#comment-18068 [...] Since yesterday I’m testing the texture implementation of Andreas’ surface library (thanks for sending the early version) in combination with various blending modes (already documented and described by Robert Hodgin a few weeks ago - Mini-tutorial: Additive Blending pt. 1 / pt. 2). After increasing the Eclipse startup memory settings, I was able to load even highres textures and to write highres stills using the TileSaver class by Marius once again. [...] [...] Since yesterday I’m testing the texture implementation of Andreas’ surface library (thanks for sending the early version) in combination with various blending modes (already documented and described by Robert Hodgin a few weeks ago – Mini-tutorial: Additive Blending pt. 1 / pt. 2). After increasing the Eclipse startup memory settings, I was able to load even highres textures and to write highres stills using the TileSaver class by Marius once again. [...]

]]> By: flight404 http://www.flight404.com/blog/?p=71&cpage=1#comment-9741 flight404 Mon, 02 Apr 2007 06:57:00 +0000 http://www.flight404.com/blog/?p=71#comment-9741 Huzzah, I figured it out. I just put in gl.glClear(GL.GL_DEPTH_BUFFER_BIT) before drawing the solids (which I an drawing before the blended stuff) and I get the expected results. Gotta go slow though... worried I might fall into the lens flare / page curl trap and end up overusing something because it is pretty and easy. But still, I love it! Huzzah, I figured it out. I just put in gl.glClear(GL.GL_DEPTH_BUFFER_BIT) before drawing the solids (which I an drawing before the blended stuff) and I get the expected results. Gotta go slow though… worried I might fall into the lens flare / page curl trap and end up overusing something because it is pretty and easy. But still, I love it!

]]> By: flight404 http://www.flight404.com/blog/?p=71&cpage=1#comment-9729 flight404 Mon, 02 Apr 2007 05:23:13 +0000 http://www.flight404.com/blog/?p=71#comment-9729 John, this is what I meant about the 3D shapes never clearing. http://www.flickr.com/photos/flight404/443162524/ http://www.flickr.com/photos/flight404/443166441/ I am drawing a box() and it is rotating around in the space that is filled with a few audio responsive glow images. The box redraws on itself over and over leaving this (admittedly interesting) unintended effect. This only happens when I draw the box before the glows. If I do it the way you specified, it works as you said it would. But if I switch it up so the blended objects draw last and the 3D shapes draw first, I get the odd effect. Id like to figure out how to capitalize on it though. I like the images that I put up on flickr. John, this is what I meant about the 3D shapes never clearing.
http://www.flickr.com/photos/flight404/443162524/
http://www.flickr.com/photos/flight404/443166441/
I am drawing a box() and it is rotating around in the space that is filled with a few audio responsive glow images. The box redraws on itself over and over leaving this (admittedly interesting) unintended effect. This only happens when I draw the box before the glows. If I do it the way you specified, it works as you said it would. But if I switch it up so the blended objects draw last and the 3D shapes draw first, I get the odd effect. Id like to figure out how to capitalize on it though. I like the images that I put up on flickr.

]]> By: Hugues http://www.flight404.com/blog/?p=71&cpage=1#comment-9708 Hugues Mon, 02 Apr 2007 01:59:45 +0000 http://www.flight404.com/blog/?p=71#comment-9708 I'm trying to make the same king of glow/blending effect but using a sphere as supporting structure. How is it possible ? I mean, using a gradient orb works when mapped on a "simple" square, but what about a 3D sphere ? I’m trying to make the same king of glow/blending effect but using a sphere as supporting structure. How is it possible ?
I mean, using a gradient orb works when mapped on a “simple” square, but what about a 3D sphere ?

]]> By: JohnG http://www.flight404.com/blog/?p=71&cpage=1#comment-9693 JohnG Sun, 01 Apr 2007 22:26:52 +0000 http://www.flight404.com/blog/?p=71#comment-9693 Not sure what you mean by "3d shapes never clear" but here's a pseudo code example of how I use it: //draw starts... //Draw solid 3D objects pgl.beginGL(); gl.glDepthMask(false); gl.glBlendFunc( GL.GL_SRC_ALPHA, GL.GL_ONE ); pgl.endGL(); // I think you can do it like this... // draw blended objects; pgl.beginGL(); gl.glDepthMask(true); gl.glBlendFunc(GL.GL_SRC_ALPHA, GL.GL_ONE_MINUS_SRC_ALPHA); pgl.endGL(); //draw more 3D if you want, but will always be "in-front-of" the transparent parts Not sure what you mean by “3d shapes never clear” but here’s a pseudo code example of how I use it:

//draw starts…

//Draw solid 3D objects

pgl.beginGL();
gl.glDepthMask(false);
gl.glBlendFunc( GL.GL_SRC_ALPHA, GL.GL_ONE );
pgl.endGL(); // I think you can do it like this…
// draw blended objects;

pgl.beginGL();
gl.glDepthMask(true);
gl.glBlendFunc(GL.GL_SRC_ALPHA, GL.GL_ONE_MINUS_SRC_ALPHA);
pgl.endGL();

//draw more 3D if you want, but will always be “in-front-of” the transparent parts

]]> By: flight404 http://www.flight404.com/blog/?p=71&cpage=1#comment-9677 flight404 Sun, 01 Apr 2007 18:59:10 +0000 http://www.flight404.com/blog/?p=71#comment-9677 Great links Aaron. Thanks! And Gilbert, I am going to delete your two comments and add your emailed explanation in a separate post. I didnt see any character limit for comments so not sure what else to do except post it separately. Thanks for taking the time to write it up. Great links Aaron. Thanks!
And Gilbert, I am going to delete your two comments and add your emailed explanation in a separate post. I didnt see any character limit for comments so not sure what else to do except post it separately. Thanks for taking the time to write it up.

]]> By: Aaron http://www.flight404.com/blog/?p=71&cpage=1#comment-9675 Aaron Sun, 01 Apr 2007 18:49:59 +0000 http://www.flight404.com/blog/?p=71#comment-9675 Hey Robert, There is a really good explanation of all the math behind alpha blending in this 3 part blog series: http://blogs.msdn.com/etayrien/archive/2006/12/07/alpha-blending-part-1.aspx http://blogs.msdn.com/etayrien/archive/2006/12/12/alpha-blending-part-2.aspx http://blogs.msdn.com/etayrien/archive/2006/12/19/alpha-blending-part-3.aspx Part 3 is where they get into additive blending specifically, but you'll have a much clearer idea of how different blending modes work (and how the depth buffer fits in) after reading the series. Hey Robert,

There is a really good explanation of all the math behind alpha blending in this 3 part blog series:

http://blogs.msdn.com/etayrien/archive/2006/12/07/alpha-blending-part-1.aspx
http://blogs.msdn.com/etayrien/archive/2006/12/12/alpha-blending-part-2.aspx
http://blogs.msdn.com/etayrien/archive/2006/12/19/alpha-blending-part-3.aspx

Part 3 is where they get into additive blending specifically, but you’ll have a much clearer idea of how different blending modes work (and how the depth buffer fits in) after reading the series.

]]> By: flight404 http://www.flight404.com/blog/?p=71&cpage=1#comment-9672 flight404 Sun, 01 Apr 2007 18:27:33 +0000 http://www.flight404.com/blog/?p=71#comment-9672 Here is a question for you random geniuses... should the glEnable and glBlendFunc calls exist between pgl.beginGL() and pgl.endGL()? It seems to work fine without them. Also, JohnG, when I play with the glDepthMask, the 3D shapes I draw never clear. I tried playing with glClear but no go. Suggestions? Here is a question for you random geniuses… should the glEnable and glBlendFunc calls exist between pgl.beginGL() and pgl.endGL()? It seems to work fine without them. Also, JohnG, when I play with the glDepthMask, the 3D shapes I draw never clear. I tried playing with glClear but no go. Suggestions?

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