Processing 1.0 - Processing Discourse - Alpha Mapping Transparencies?

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Index › Programming Questions & Help › Syntax Questions › Alpha Mapping Transparencies

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Alpha Mapping Transparencies? (Read 697 times)

pwn monkey Junior Member Offline Posts: 53	Alpha Mapping Transparencies? Feb 14^th, 2010, 10:21pm Hey guys, does anyone know how to alpha map transparencies? Im using it for a game where there needs to be multiple lights (transparent gradients) that can clip together without having the edges.

Cedric YaBB Moderator Offline Posts: 1838	Re: Alpha Mapping Transparencies? Reply #1 - Feb 14^th, 2010, 10:47pm you can simply create and load some pngs with transparencies. Thats how i do it. but it you want to use an alpha map image try out http://processing.org/reference/PImage_mask_.html
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pwn monkey Junior Member Offline Posts: 53	Re: Alpha Mapping Transparencies? Reply #2 - Feb 14^th, 2010, 10:53pm no i realize that, but how exactly would you do it? my .png files gradient from full alpha to black, yet when 2 of them clip eachother the black edges cover eachother

Quark

Re: Alpha Mapping Transparencies?
Reply #3 - Feb 15^th, 2010, 12:45am

One way is to have 2 images (same size) the first image is what you want to draw and the second defines the level of transparency these are then combined to give pixel level transparency.

This is the approach I used in a Sprite library I created. You could either use this library or if you want to do your own coding look at the constructors in the Sprite class for this library to see how it is done.

Just looked at the link in Cedric's responce and thats probably an easier way of doing it - Ah well I have been using Processing for over a year and I am still have things to learn about it!

PhiLho YaBB Moderator Offline Posts: 4190 Near Paris (France)	Re: Alpha Mapping Transparencies? Reply #4 - Feb 15^th, 2010, 1:11am IIRC, you have to use PGraphics in JAVA2D mode to fully use image transparency. Not sure if that's your problem, as you show no code. At least, it is worth trying...

pwn monkey Junior Member Offline Posts: 53	Re: Alpha Mapping Transparencies? Reply #5 - Feb 15^th, 2010, 10:20pm Ok I got it working! Thanks guys for the help. Sorry if it was a dumb question

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