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AppGameKit Classic Chat / Blend modes with objects

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wargasmic
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Posted: 28th Mar 2013 00:36
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Is it possible to use blend modes such as additive on objects or does this require a fullscreen shader like the glow effect?
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Markus
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Posted: 28th Mar 2013 08:19
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you mean this?

SetObjectTransparency
Description
Sets the transparency mode for this object, 0 is opaque, 1 is alpha blended, 2 is additive blended. Using a transprency mode greater than 0 unnecessarily will slow down rendering.

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wargasmic
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Posted: 28th Mar 2013 17:12
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I'm after an effect like in this image http://2.bp.blogspot.com/_FHWVwXZaDOM/TRlTkNNW92I/AAAAAAAAAW8/qQrCdef98R4/s1600/gw2_noChance.jpgwhere the enemies all clump together and overlap an additive blendmode gives the impression of a white glow in the center. Setting transparency to 2 doesn't give this effect, in fact it looks exactly the same as having it set to 1.
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xCept
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Posted: 28th Mar 2013 19:40
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Unfortunately AppGameKit doesn't support true blend modes yet; that would be an excellent addition and one that I would use frequently including in one WIP app.
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lilpissywilly
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Posted: 28th Mar 2013 19:50 Edited at: 28th Mar 2013 19:52
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If the objects are small-ish and you aren't changing the perspective (looks like the example is Geometry Wars or something?) then you could perhaps fake it by setting objectcolor when objects overlap depending on viewpoint? Yes it would look weird if the objects were big

Or you could use a point light with a color above 255, 255, 255 at a point of congregation. I found this effect of the point light when I accidentally set the point light color to waaay higher than 255 heh

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wargasmic
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Posted: 28th Mar 2013 20:55
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Yes it is a screenshot of geometry wars 2.

I'm making a game heavily inspired by it.

I did think of using the point light approach but I'm not using lighting at all in my game plus it wouldn't look as natural as it would be a perfect sphere of light.

However I have suddenly thought of another method since all enemies track each other I'm going to try adding a white glow over the top of each one that varies in brightness depending on how many enemies are nearby.
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Mobiius
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Posted: 28th Mar 2013 21:09
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Can you not just use semi-transparent textures. When they overlap the brightness should bleed into each other? Then you could apply a bloom shader to the screen to increase the effect maybe?

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wargasmic
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Posted: 28th Mar 2013 21:55
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I'm already using semi-transparent textures. When they overlap they just form a solid blob of their actual colour.

As for a bloom shader, apparently agk doesn't support fullscreen shaders yet.
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wargasmic
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Posted: 28th Mar 2013 21:58 Edited at: 28th Mar 2013 22:03
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My idea works but unfortunately calling SetObjectColor so often is really slow

Edit: Scratch that, there was something else causing the slow down
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wargasmic
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Posted: 28th Mar 2013 22:29
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Quick test. Will tweak it some more but you get the idea.

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lilpissywilly
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Posted: 28th Mar 2013 23:38
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Looks cool!

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wargasmic
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Posted: 29th Mar 2013 03:36
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Really need proper blend modes.

Paul i'll give you 50 quid if you make it happen now
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nz0
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Posted: 29th Mar 2013 23:32
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^^ LOL

(even bigger LOL as I couldn't post the above) - "turn capslock off"

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wargasmic
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Posted: 30th Mar 2013 00:04
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No joking, I was being serious. Anyone wanna chip 50 quid in for blend modes (and full screen shaders)?.....see what paul says
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xCept
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Posted: 30th Mar 2013 00:28
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^ I'll totally chip in money for sprite-based blend modes
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nz0
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Posted: 30th Mar 2013 00:42
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Carefull, you'll set a new precident

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wargasmic
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Posted: 30th Mar 2013 02:44 Edited at: 30th Mar 2013 02:44
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Quote: "Carefull, you'll set a new precident"


Lol, paid upgrades...nooooooooo.

Just want to tempt the agk devs to make the stuff we want first
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nz0
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Posted: 30th Mar 2013 02:50
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Hell, I'd chip in for something as basic as set sound pitch

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wargasmic
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Posted: 30th Mar 2013 02:55
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I want that too!!
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