How do I get the pixel's coords.

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How do I get the pixel's coords. #418622 02/27/13 15:09 02/27/13 15:09
Joined: Jun 2009 Posts: 2,210 Bavaria, Germany Kartoffel OP Expert
Kartoffel OP Expert Joined: Jun 2009 Posts: 2,210 Bavaria, Germany	Hi, I've got a simple question: How do I calculate / get the screen-space coordinates of a pixel in an object shader? POTATO-MAN saves the day! - Random

Re: How do I get the pixel's coords. [Re: Kartoffel] #418649 02/27/13 20:19 02/27/13 20:19
Joined: May 2005 Posts: 2,713 L�beck Slin Expert
Slin Expert Joined: May 2005 Posts: 2,713 L�beck	screenpos = (mul(matModelWorldProj, pos).xy*0.5+0.5); or what should also work is VPOS: http://msdn.microsoft.com/en-us/library/windows/desktop/bb509647(v=vs.85).aspx#VPOS Lite-C Tut. 1 Lite-C Tut. 2 Lite-C Tut. 3 (en) Shader Tutorial (ger) http://www.slindev.com

Re: How do I get the pixel's coords. [Re: Slin] #418654 02/27/13 21:14 02/27/13 21:14
Joined: Jun 2009 Posts: 2,210 Bavaria, Germany Kartoffel OP Expert
Kartoffel OP Expert Joined: Jun 2009 Posts: 2,210 Bavaria, Germany	Thans a lot, vPos does the job: float4 screenSpace : vPos // input semantic float2 texSS = screenSpace.xy / vecViewPort.xy; // screenspace coordinates POTATO-MAN saves the day! - Random

Re: How do I get the pixel's coords. [Re: Kartoffel] #418656 02/27/13 21:22 02/27/13 21:22
Joined: Mar 2006 Posts: 2,252 Hummel Expert
Hummel Expert Joined: Mar 2006 Posts: 2,252	Dont forget the half-pixel offset! That's what I use: Code: float2 calc_ScreenPos(float4 pPos) { return (float2(pPos.x,-pPos.y)/pPos.w+vecViewPort.zw)*0.5+0.5; }

Re: How do I get the pixel's coords. [Re: Hummel] #418659 02/27/13 21:25 02/27/13 21:25
Joined: Jun 2009 Posts: 2,210 Bavaria, Germany Kartoffel OP Expert
Kartoffel OP Expert Joined: Jun 2009 Posts: 2,210 Bavaria, Germany	I just noticed some strange aliasing and found it out myself Again, thank you very much! POTATO-MAN saves the day! - Random

Re: How do I get the pixel's coords. [Re: Kartoffel] #418665 02/27/13 22:12 02/27/13 22:12
Joined: Jun 2009 Posts: 2,210 Bavaria, Germany Kartoffel OP Expert
Kartoffel OP Expert Joined: Jun 2009 Posts: 2,210 Bavaria, Germany	...and now my deferred lighting works POTATO-MAN saves the day! - Random

Re: How do I get the pixel's coords. [Re: Kartoffel] #418682 02/28/13 13:41 02/28/13 13:41
Joined: Mar 2006 Posts: 2,252 Hummel Expert
Hummel Expert Joined: Mar 2006 Posts: 2,252	Nice!

Re: How do I get the pixel's coords. [Re: Hummel] #418685 02/28/13 15:48 02/28/13 15:48
Joined: Jun 2009 Posts: 2,210 Bavaria, Germany Kartoffel OP Expert
Kartoffel OP Expert Joined: Jun 2009 Posts: 2,210 Bavaria, Germany	But now I've got the problem that I need to render the deferred lights into a specific texture, not the camera's .bmap Does anyone know a good method to do this? POTATO-MAN saves the day! - Random

Re: How do I get the pixel's coords. [Re: Kartoffel] #418686 02/28/13 15:51 02/28/13 15:51
Joined: Nov 2007 Posts: 2,568 Germany, BW, Stuttgart MasterQ32 Expert
MasterQ32 Expert Joined: Nov 2007 Posts: 2,568 Germany, BW, Stuttgart	use the material event and a second stage camera material renders only the scene, the second material only lights just use ENABLE_RENDER Visit my site: www.masterq32.de

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