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Homer_simpson

Wed Jan 28, 2009 11:56 pm


Opengl help

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ok i'm making a space game, I added a cockpit picture to be drawn on top of the background, i used masking with blending but i realized it significantly lowers fps rate.
any alternate ideas on how to render a cockpit on top of the background scene?


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CodeMonkey2000

Thu Jan 29, 2009 2:18 am


RE:Opengl help

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Did you try using a PNG with an alpha channel?


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md

Thu Jan 29, 2009 8:31 am


RE:Opengl help

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Textured quad with transparency, should be rather fast and easy to do. Positioning it might be a bit more of a challenge though.


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Homer_simpson

Thu Jan 29, 2009 11:35 am


Re: RE:Opengl help

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Did you try using a PNG with an alpha channel?
ok i'm making a space game, I added a cockpit picture to be drawn on top of the background, i used masking with blending but i realized it significantly lowers fps rate.
any alternate ideas on how to render a cockpit on top of the background scene?

those 2 are the same thing, and that is what i've done


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md

Thu Jan 29, 2009 11:42 am


RE:Opengl help

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Multiple textured quads without transparency? :P


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Homer_simpson

Thu Jan 29, 2009 1:36 pm


Re: Opengl help

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never mind, alpha testing took care of it  :D 

load a transparent tga file and do this when drawing the cockpit: 
   	glAlphaFunc(GL_GREATER,0.1f);
	glEnable(GL_ALPHA_TEST);


Mod Edit: Language must be in quotations for the syntax tags, "cpp" not cpp :)