Lens Flares - Revision history

Patapom at 14:28, 19 June 2011

2011-06-19T14:28:58Z

Patapom at 14:28, 19 June 2011

2011-06-19T14:28:31Z

Patapom at 22:55, 18 June 2011

2011-06-18T22:55:42Z

Patapom at 22:38, 18 June 2011

2011-06-18T22:38:20Z

Patapom at 22:36, 18 June 2011

2011-06-18T22:36:55Z

Patapom at 22:35, 18 June 2011

2011-06-18T22:35:37Z

Patapom at 22:35, 18 June 2011

2011-06-18T22:35:09Z

Patapom at 21:47, 18 June 2011

2011-06-18T21:47:19Z

Patapom at 21:45, 18 June 2011

2011-06-18T21:45:48Z

Patapom at 21:45, 18 June 2011

2011-06-18T21:45:11Z

← Older revision		Revision as of 14:28, 19 June 2011
Line 172:		Line 172:
	There are obvious discrepancies like luminosity levels, difference in sharpness of some elements and obviously the randomly placed elements not being at the exact same place in both renderings. Some of these are due to simplifications on my part, others to inaccurate formulas and as there can be up to 20 elements, each displaying maybe hundreds of additive primitives, the differences can show pretty rapidly but I believe the result is still quite acceptable for my purpose.		There are obvious discrepancies like luminosity levels, difference in sharpness of some elements and obviously the randomly placed elements not being at the exact same place in both renderings. Some of these are due to simplifications on my part, others to inaccurate formulas and as there can be up to 20 elements, each displaying maybe hundreds of additive primitives, the differences can show pretty rapidly but I believe the result is still quite acceptable for my purpose.

−	Check out the [[http://www.youtube.com/watch?v=b0mSNwpFHSM video]] for more lens flares and to see their realtime behaviour.	+	Check out the [http://www.youtube.com/watch?v=b0mSNwpFHSM video] for more lens flares and to see their realtime behaviour.

← Older revision		Revision as of 14:28, 19 June 2011
Line 171:		Line 171:

	There are obvious discrepancies like luminosity levels, difference in sharpness of some elements and obviously the randomly placed elements not being at the exact same place in both renderings. Some of these are due to simplifications on my part, others to inaccurate formulas and as there can be up to 20 elements, each displaying maybe hundreds of additive primitives, the differences can show pretty rapidly but I believe the result is still quite acceptable for my purpose.		There are obvious discrepancies like luminosity levels, difference in sharpness of some elements and obviously the randomly placed elements not being at the exact same place in both renderings. Some of these are due to simplifications on my part, others to inaccurate formulas and as there can be up to 20 elements, each displaying maybe hundreds of additive primitives, the differences can show pretty rapidly but I believe the result is still quite acceptable for my purpose.
		+
		+	Check out the [[http://www.youtube.com/watch?v=b0mSNwpFHSM video]] for more lens flares and to see their realtime behaviour.

← Older revision		Revision as of 22:55, 18 June 2011
Line 80:		Line 80:

	* Iris instantiate N quads where is drawn a procedural shape (circle or polygon). Irises can also apply textures from a bank instead of a procedural generation. Irises are the most common and recognizable objects in lens-flares.		* Iris instantiate N quads where is drawn a procedural shape (circle or polygon). Irises can also apply textures from a bank instead of a procedural generation. Irises are the most common and recognizable objects in lens-flares.
		+
		+
		+
		+	== Fullscreen Modifiers ==
		+
		+	There is also a final blending pass that blends the lens-flare to the screen, adding interesting features like :
		+	* Lens Texture, a "dirt" texture on the lens that gets revealed by the lights
		+
		+	[[File:LensTexture.png\|thumb\|center\|400px\|The lens texture lets appear dirt on the lens when the light moves.]]
		+
		+	* Chromatic Aberrations, like the "purple fringe" and "red/blue shift" that separate color components (NOTE: It's not advised to use these as the screen is sampled multiple times to achieve the effect : twice for the purple fringe and 3 times for the red/blue shift).
		+
		+	[[File:ChromaticAberration.png\|thumb\|center\|400px\|Red/Blue shift aberration where R, G and B components are dissociated.]]
		+
		+	* Standard HSL color correction
		+

← Older revision		Revision as of 22:38, 18 June 2011
Line 146:		Line 146:
	After spending almost a whole month replicating the Optical Flares technology, I have to admit these guys are quite clever ! They use some pretty cool combinations of additive geometries to achieve nice and unexpected results.		After spending almost a whole month replicating the Optical Flares technology, I have to admit these guys are quite clever ! They use some pretty cool combinations of additive geometries to achieve nice and unexpected results.

−	That was quite hard work but I'm pretty happy with the result, even though there are some configurations that are still quite wrong and although I couldn't achieve to replicate all their objects faithfully. That's also one of the reasons why I believe the guys at Video Copilot are clever (except on their file format), as they have used some pretty messed up functions that I couldn't exactly pinpoint !	+	That was quite hard work but I'm pretty happy with the result, even though there are some configurations that are still quite wrong and although I couldn't achieve to replicate all their objects faithfully. That's also one of the reasons why I believe the guys at Video Copilot are clever (except on their [[OFPFileFormat\|file format]]), as they have used some pretty messed up functions that I couldn't exactly pinpoint !

← Older revision		Revision as of 22:36, 18 June 2011
Line 154:		Line 154:


−	There are obvious discrepancies like luminosity levels, difference in sharpness of some elements and obviously the randomly placed elements not being at the exact same place in both renderings. Some of these are due to simplifications on my ~~parts~~, others to inaccurate formulas and as there can be up to 20 elements, each ~~may be~~ displaying hundreds of additive primitives, the differences can show pretty rapidly but I believe ~~they are~~ quite acceptable for my purpose.	+	There are obvious discrepancies like luminosity levels, difference in sharpness of some elements and obviously the randomly placed elements not being at the exact same place in both renderings. Some of these are due to simplifications on my part, others to inaccurate formulas and as there can be up to 20 elements, each displaying maybe hundreds of additive primitives, the differences can show pretty rapidly but I believe the result is still quite acceptable for my purpose.

@@ Line 151: / Line 151: @@
 Here is a comparison of the rendering done by Nuaj' and the one in After Effect :
-[[File:LensFlareComparisonVC.png|thumb|center|400px|Video Copilot's Rendering]]   [[File:LensFlareComparisonNuaj'.png|thumb|center|400px|Nuaj' Rendering]]
+[[File:LensFlareComparisonVC.png|thumb|left|400px|Video Copilot's Rendering]]   [[File:LensFlareComparisonNuaj'.png|thumb|center|400px|Nuaj' Rendering]]
 There are obvious discrepancies like luminosity levels, difference in sharpness of some elements and obviously the randomly placed elements not being at the exact same place in both renderings. Some of these are due to simplifications on my parts, others to inaccurate formulas and as there can be up to 20 elements, each may be displaying hundreds of additive primitives, the differences can show pretty rapidly but I believe they are quite acceptable for my purpose.

@@ Line 84: / Line 84: @@
 == Screen Blend Mode ==
-On top of the default additive blend mode, the people at video copilot also used a mode quite familiar to Adobe products (but not so much to realtime graphics programmers) called the '''screen''' mode. I'll talk a bit about how to achieve this mode using our standard blending pipeline in graphic APIs as it's not that easy !
+On top of the default additive blend mode, the people at video copilot also used a mode quite familiar to Adobe products users (but not so much to realtime graphics programmers) called the '''screen''' mode. I'll talk a bit about how to achieve this mode using our standard blending pipeline in graphic APIs as it's not that easy !
 The screen mode is considered to be the opposite of the multiply mode. The blending equation is like this :
@@ Line 110: / Line 110: @@
 Assuming you patch your shader to return 1-Src instead of Src, you can yet manage to do '''(1-Src)*(1-Dst)''' which is starting to get close enough.
-Let's see what happens if we use the reduced screen mode formula '''Dst'=(1-Src)*(1-Dst)''' for 2 primitives :
+Let's see what happens if we use the reduced screen mode formula '''Dst'=(1-Src)*(1-Dst)''' for 2 steps :
   Dst_1 = (1-Src_0)*(1-Dst_0)   <== Here, Dst_0 is the original black background
@@ Line 146: / Line 146: @@
 After spending almost a whole month replicating the Optical Flares technology, I have to admit these guys are quite clever ! They use some pretty cool combinations of additive geometries to achieve nice and unexpected results.
-That was quite hard work but I'm pretty happy with the result, even though there are some configurations that are still quite wrong and although I couldn't achieve to replicate all their objects faithfully. That's also one of the reasons why I believe the guys at Video Copilot are quite clever (except on their file format), as they have used some pretty messed up functions that I couldn't exactly pinpoint.
+That was quite hard work but I'm pretty happy with the result, even though there are some configurations that are still quite wrong and although I couldn't achieve to replicate all their objects faithfully. That's also one of the reasons why I believe the guys at Video Copilot are clever (except on their file format), as they have used some pretty messed up functions that I couldn't exactly pinpoint !
 Here is a comparison of the rendering done by Nuaj' and the one in After Effect :
-[[File:LensFlareComparisonVC.png|thumb|left|400px|Video Copilot's Rendering]]   [[File:LensFlareComparisonNuaj'.png|thumb|center|400px|Nuaj' Rendering]]
+[[File:LensFlareComparisonVC.png|thumb|center|400px|Video Copilot's Rendering]]   [[File:LensFlareComparisonNuaj'.png|thumb|center|400px|Nuaj' Rendering]]
 There are obvious discrepancies like luminosity levels, difference in sharpness of some elements and obviously the randomly placed elements not being at the exact same place in both renderings. Some of these are due to simplifications on my parts, others to inaccurate formulas and as there can be up to 20 elements, each may be displaying hundreds of additive primitives, the differences can show pretty rapidly but I believe they are quite acceptable for my purpose.

@@ Line 26: / Line 26: @@
 [[File:OpticalFlaresLensObjects.png|thumb|center|400px|The 12 types of "Lens Objects" supported by Video Copilot's ''Optical Flares'']]
-Of course, this class only ''describes'' a lens flare, it doesn't ''display'' a lens-flare. So that's what we're going to see next.
+Of course, this class only ''describes'' a lens flare, it doesn't ''display'' a lens-flare. So that's what we're going to see later.
 == Global Modifiers ==

@@ Line 140: / Line 140: @@
 It may not look like much but the difference between screen and additive blend modes is actually quite important as shown in the examples below :
-[[File:BlendModeScreen.png|thumb|left|400px|Screen Mode]]
+[[File:BlendModeScreen.png|thumb|left|400px|Screen Blending]]
-[[File:BlendModeAdditive.png|thumb|center|400px|Screen Mode]]
+[[File:BlendModeAdditive.png|thumb|center|400px|Additive Blending]]

← Older revision		Revision as of 21:45, 18 June 2011
Line 135:		Line 135:
	# A final complement of the last Dst_N buffer		# A final complement of the last Dst_N buffer

−	So here you go : ~~SCREEN~~ blend mode for you	+	So here you go : '''screen''' blend mode for you
		+
		+
		+	It may not look like much but the difference between screen and additive blend modes is actually quite important as shown in the examples below :
		+
		+	[[File:BlendModeScreen.png\|thumb\|left\|400px\|Screen Mode]]
		+	[[File:BlendModeAdditive.png\|thumb\|center\|400px\|Screen Mode]]